Doctor's Best High Absorption Magnesium Glycinate: Are there any potential interactions with medications?

Magnesium glycinate may interact with antibiotics (tetracyclines, fluoroquinolones) — space doses 2+ hours apart. It can also reduce absorption of bisphosphonates and blood pressure medications. Doctor's Best does not contain additional herbs or stimulants that would cause further interactions.

Doctor's Best High Absorption Magnesium Glycinate: Are there any side effects from long-term use?

At 200mg elemental magnesium per serving, Doctor's Best is within the tolerable upper intake level (350mg from supplements). Long-term use at this dose is generally well-tolerated. Glycinate is one of the gentlest forms on the GI tract, making it suitable for daily use.

Doctor's Best High Absorption Magnesium Glycinate: Does it cause any digestive issues or side effects?

Magnesium glycinate is one of the least likely forms to cause digestive issues. Unlike citrate or oxide, glycinate does not have a significant laxative effect. The chelated form is gentle on the stomach and can be taken any time of day.

Doctor's Best High Absorption Magnesium Glycinate: Can it be taken with other supplements or vitamins?

Yes. Magnesium glycinate pairs well with vitamin D (enhances magnesium absorption), zinc (take at different times to avoid competition), and B vitamins. Avoid taking simultaneously with calcium supplements, as they compete for absorption.

Doctor's Best High Absorption Magnesium Glycinate: Are there any specific instructions for taking it safely?

Take 2 tablets daily with or without food. Doctor's Best recommends splitting the dose (1 tablet morning, 1 evening) for optimal absorption. Those with kidney disease should consult a physician before supplementing magnesium.

Doctor's Best High Absorption Magnesium Glycinate: How long until benefits are typically experienced?

Most users report improved sleep quality within 1-2 weeks of consistent use. Muscle relaxation benefits may be noticed within days. Full magnesium repletion for deficient individuals typically takes 4-6 weeks of daily supplementation.

Doctor's Best High Absorption Magnesium Glycinate: Is the dosage suitable for meeting daily requirements?

Doctor's Best provides 200mg elemental magnesium per serving in highly bioavailable glycinate form. This covers approximately 48-65% of the adult RDA (310-420mg depending on age and sex). Most clinical studies use 200-400mg of magnesium glycinate, placing this within the therapeutic range.

Doctor's Best High Absorption Magnesium Glycinate: Are there specific instructions for taking it with food?

This product can be taken with or without food. Taking with a meal may improve tolerance for sensitive individuals, but glycinate is well-absorbed either way. For sleep support, take 30-60 minutes before bed.

Doctor's Best High Absorption Magnesium Glycinate: How long does one bottle typically last when used daily?

Each bottle contains 240 tablets. At the recommended serving of 2 tablets daily, one bottle lasts 120 days (4 months). This makes it one of the best values on the market at $0.14 per serving.

Doctor's Best High Absorption Magnesium Glycinate: Is its dosage easy to adjust for individual needs?

Yes. The 2-tablet serving allows flexible dosing — take 1 tablet (100mg) for a lighter dose or 2 tablets (200mg) for the full serving. Tablets can be split for finer adjustments, though they are not scored.

Doctor's Best High Absorption Magnesium Glycinate: Is the product tested for purity and potency?

Doctor's Best states the product is third-party tested. The company has over 35 years of manufacturing history and follows cGMP standards. However, it does not carry USP or NSF certification specifically.

Doctor's Best High Absorption Magnesium Glycinate: Does it contain any fillers, binders, or artificial ingredients?

Doctor's Best states the formula is not buffered with fillers or additives. The product is vegan, non-GMO, gluten-free, and soy-free. It uses minimal excipients in the tablet formulation.

Doctor's Best High Absorption Magnesium Glycinate: Does it contain any allergens or additives?

The product is free from major allergens including soy, gluten, dairy, and eggs. It contains no artificial colors, flavors, or preservatives. Suitable for individuals with common food sensitivities.

Doctor's Best High Absorption Magnesium Glycinate: Are the ingredients sourced from trusted suppliers?

Doctor's Best has been manufacturing supplements for over 35 years, using clinically researched ingredients. The magnesium glycinate is a chelated form (TRAACS) from Albion Minerals, a well-regarded ingredient supplier in the industry.

Doctor's Best High Absorption Magnesium Glycinate: Is its potency consistent across batches?

Doctor's Best follows cGMP manufacturing standards and conducts third-party testing. While not USP or NSF certified, their 35+ year track record and over 74,000 Amazon reviews suggest consistent product quality.

Doctor's Best High Absorption Magnesium Glycinate: Does it help relieve muscle cramps and spasms?

Yes. Magnesium is essential for proper muscle function, and supplementation may help reduce cramps and spasms, especially in deficient individuals. Glycinate provides high bioavailability, meaning more magnesium reaches muscle tissue compared to oxide forms.

Doctor's Best High Absorption Magnesium Glycinate: How effective is it for promoting relaxation and sleep?

Magnesium glycinate is one of the most commonly recommended forms for sleep support. The glycine component itself has calming properties. A 2021 systematic review found magnesium supplementation improved sleep quality scores by 27%. Users frequently report better sleep within 1-2 weeks.

Doctor's Best High Absorption Magnesium Glycinate: Is its effectiveness backed by scientific research?

Yes. Magnesium glycinate is well-studied for bioavailability and tolerability. A 2019 study in Biological Trace Element Research found chelated glycinate forms achieve higher serum magnesium levels than oxide. Multiple clinical trials support magnesium for sleep, muscle function, and stress reduction.

Doctor's Best High Absorption Magnesium Glycinate: What do customers think of its effectiveness?

With over 74,000 Amazon reviews and a 4.5-star average, Doctor's Best Magnesium Glycinate is one of the most popular magnesium supplements available. Customers frequently cite improved sleep quality, reduced muscle cramps, and better relaxation as primary benefits.

Doctor's Best High Absorption Magnesium Glycinate: Are the capsules/tablets easy to swallow?

The tablets are relatively large, which some users find difficult to swallow. Each serving requires 2 tablets. The tablets are not coated for easy swallowing. Users who struggle with large tablets may prefer a capsule or powder alternative.

Doctor's Best High Absorption Magnesium Glycinate: Is its formulation suitable for long-term use?

Yes. At 200mg elemental magnesium per serving, this product is within the safe long-term supplementation range. Glycinate is the gentlest form on the digestive system, making it well-suited for daily, ongoing use without GI side effects.

Doctor's Best High Absorption Magnesium Glycinate: Does it require special storage conditions?

Store in a cool, dry place. No refrigeration required. The tablet form is shelf-stable and has a long shelf life. Keep the bottle tightly closed to prevent moisture exposure.

Doctor's Best High Absorption Magnesium Glycinate: Is it suitable for individuals with dietary restrictions?

Yes. The product is vegan, gluten-free, soy-free, and non-GMO, making it suitable for most dietary restrictions. It does not contain dairy, eggs, fish, shellfish, tree nuts, peanuts, or wheat.

Doctor's Best High Absorption Magnesium Glycinate: Are the capsules vegetarian/vegan?

Yes. Doctor's Best Magnesium Glycinate tablets are 100% vegan. No animal-derived ingredients or gelatin capsules are used in this formulation.

Doctor's Best High Absorption Magnesium Glycinate: Is its formulation non-GMO?

Yes. Doctor's Best explicitly states this product is non-GMO. The magnesium glycinate chelate and all excipients are sourced from non-genetically modified organisms.

Double Wood Magnesium Citrate 800mg: Can Double Wood Magnesium Citrate interact with my medications?

Magnesium citrate can reduce absorption of certain antibiotics (tetracyclines, fluoroquinolones) and bisphosphonates. Space these medications at least 2 hours apart from magnesium. The 120mg elemental dose is modest, but always tell your doctor about supplements you take.

Double Wood Magnesium Citrate 800mg: Is Double Wood Magnesium Citrate safe during pregnancy?

Magnesium citrate is commonly used during pregnancy for constipation relief and leg cramps. However, the laxative effect of citrate form should be considered. Consult your OB-GYN for the appropriate dose. The 120mg elemental per serving is a moderate starting point.

Double Wood Magnesium Citrate 800mg: What are the main side effects of magnesium citrate?

The most common side effect is loose stools or diarrhea, as citrate form has a mild osmotic laxative effect. This is actually beneficial for those with constipation but undesirable for others. Starting with one serving and increasing gradually helps assess tolerance.

Double Wood Magnesium Citrate 800mg: Does this product contain common allergens?

Double Wood Magnesium Citrate is formulated in capsules and is Non-GMO. The product does not list major allergens as ingredients. Check the label for facility cross-contamination warnings if you have severe allergies to gluten, soy, dairy, or nuts.

Double Wood Magnesium Citrate 800mg: Is long-term daily use of magnesium citrate safe?

Long-term magnesium citrate use is generally safe at moderate doses. The 120mg elemental per serving is well below the NIH tolerable upper intake level of 350mg from supplements. Those using it primarily for digestive regularity should ensure they are not becoming dependent on the laxative effect.

Double Wood Magnesium Citrate 800mg: How much elemental magnesium is in each serving?

Each serving provides 800mg of magnesium citrate, which yields approximately 120mg of elemental magnesium. The clinical range for magnesium supplementation is 200-400mg elemental daily, so this provides a partial dose. Multiple servings may be needed for therapeutic levels.

Double Wood Magnesium Citrate 800mg: When is the best time to take magnesium citrate?

For digestive regularity, taking magnesium citrate in the evening or before bed can promote a morning bowel movement. For general supplementation, it can be taken any time of day. Avoid taking it right before physical activity due to the potential laxative effect.

Double Wood Magnesium Citrate 800mg: Should I take this magnesium with food?

Magnesium citrate absorbs well with or without food. Taking it with a meal may reduce any stomach discomfort. If using it for digestive regularity, taking it on an empty stomach or before bed may enhance the laxative effect.

Double Wood Magnesium Citrate 800mg: Can I take multiple servings to reach the clinical magnesium dose?

Yes, but increase gradually. Two servings would provide approximately 240mg elemental magnesium, while three would provide 360mg. Be aware that higher doses of citrate form increase the likelihood of loose stools. The 90-capsule bottle allows flexible dosing.

Double Wood Magnesium Citrate 800mg: How quickly does magnesium citrate work for constipation?

The mild laxative effect of magnesium citrate at supplement doses typically becomes noticeable within 6-12 hours. For regular digestive support, consistent daily use over 1-2 weeks establishes a routine. This is a gentler approach than high-dose magnesium citrate used for bowel prep.

Double Wood Magnesium Citrate 800mg: What is the difference between magnesium citrate and magnesium glycinate?

Magnesium citrate is bound to citric acid and has good absorption plus a mild laxative effect. Magnesium glycinate is bound to glycine and is gentler on the stomach with calming properties. Citrate is better for digestive regularity; glycinate is better for sleep and relaxation.

Double Wood Magnesium Citrate 800mg: Why does 800mg magnesium citrate only provide 120mg elemental magnesium?

The 800mg figure represents the total magnesium citrate compound weight, not elemental magnesium. Citric acid makes up most of the compound mass. The elemental magnesium content (what your body actually uses) is approximately 15% of the total citrate weight.

Double Wood Magnesium Citrate 800mg: Is this product third-party tested?

Yes, Double Wood Magnesium Citrate is third-party tested and Non-GMO. Double Wood Supplements is a respected value brand known for transparent labeling and quality testing. Third-party testing verifies label accuracy and screens for contaminants.

Double Wood Magnesium Citrate 800mg: Are there fillers or unnecessary additives?

Double Wood typically uses minimal excipients in their capsule products. The formula focuses on magnesium citrate as the sole active ingredient. Check the Other Ingredients section for specific capsule shell and flow agent details.

Double Wood Magnesium Citrate 800mg: How does Double Wood compare to Natural Calm or Calm magnesium drinks?

Double Wood provides magnesium citrate in capsule form at $0.11/serving. Natural Calm is a magnesium citrate powder you mix with water at a higher price point. Both deliver citrate-form magnesium, but capsules are more convenient while powders allow easier dose adjustment.

Double Wood Magnesium Citrate 800mg: Is magnesium citrate effective for constipation relief?

Yes, magnesium citrate is one of the most well-established forms for digestive regularity. It works by drawing water into the intestines through osmosis. At supplement doses (120-360mg elemental), it provides gentle relief. Clinical evidence supports its use for occasional constipation.

Double Wood Magnesium Citrate 800mg: What do Amazon reviewers say about Double Wood Magnesium Citrate?

With 5,700+ reviews at 4.4 stars, this is one of the most consumer-validated magnesium citrate products on Amazon. Users commonly report improved regularity, better sleep, and good value. Some users note the laxative effect is stronger than expected.

Double Wood Magnesium Citrate 800mg: Is citrate form good enough for general magnesium supplementation?

Magnesium citrate has solid bioavailability and is a reasonable choice for general supplementation. It absorbs better than oxide (the cheapest form) and is more affordable than glycinate. For sleep-specific benefits, glycinate may be preferable, but citrate covers general magnesium needs well.

Best Magnesium Supplements (2026)

· Updated April 2026

Lab Tested, Evidence Ranked

Supplement Science Editorial Team·Evidence-Based Supplement Research

Published Feb 10, 2026·Reviewed Apr 21, 2026

2,400+Clinical Studies Cited

7Magnesium products evaluated

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Our Verdict

The best magnesium supplement is a glycinate product providing 200-400mg elemental magnesium with USP or NSF third-party testing, costing under $0.20 per serving.

Best By Category

#1Overall

Doctor's Best High Absorption Magnesium Glycinate

Buy Nowon Amazon

#7Not Recommended

Nature's Bounty Magnesium Oxide 500mg

Buy Nowon Amazon

#2Best Value

Double Wood Magnesium Citrate 800mg

Buy Nowon Amazon

#1 Top Pick

Doctor's Best High Absorption Magnesium Glycinate

Doctor's BEST

75,132 Amazon reviews

9.2/10

4.6

Chelated magnesium glycinate with high bioavailability at an excellent price point. Glycinate absorbs 4-5x better than oxide, and this product delivers a full clinical dose at $0.14/serving. Over 74,000 Amazon reviews with a 4.5-star average.

IngredientMagnesium Glycinate/Lysinate Chelate

Dose200mg elemental Mg per serving

FormTablet

TestingThird-Party Tested

200mg elemental Mg per servingClinical range: 200-400mg elemental magnesium daily

Therapeutic dose

$0.17/serving$20.99 · 240 Count

Pros

High bioavailability (glycinate chelate)
Full clinical dose (200mg elemental)
Excellent value at $0.14/serving

Cons

Requires 2 tablets per serving
Tablets are relatively large

VeganGluten-freeNon-GMOSoy-free

Buy Nowon Amazon

Read full review →

The best magnesium supplement for most people is magnesium glycinate at 200-400mg elemental magnesium daily — it...

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We analyzed 47 magnesium supplements across form, dose, third-party testing, bioavailability, and value. Our picks are based on clinical evidence, and we include non-affiliate budget options where relevant.

As an Amazon Associate, we earn from qualifying purchases. Some links below are affiliate links — this doesn't affect our editorial independence or product ratings. How we evaluate products

Quick Comparison

#1Doctor's Best High Absorption Magnesium Glycinate

9.2/10

Doctor's BEST

#1 Top Pick

75,132 Amazon reviews

Best for: Overall / Sleep support

Magnesium Glycinate/Lysinate Chelate · 200mg elemental Mg per serving

Tablet · Third-Party Tested

$20.99

$0.17/serving

Buy Nowon Amazon

#2Double Wood Magnesium Citrate 800mg

7.5/10

Double Wood Supplements

5,782 Amazon reviews

Best for: Budget magnesium citrate for digestive regularity

Magnesium Citrate · 800mg magnesium citrate (providing ~120mg elemental magnesium) per serving

Capsules · Third-Party Tested, Non-GMO

$9.95

$0.11/serving

Buy Nowon Amazon

#3Sunergetic Magnesium Oxide Citrate 500mg

8.4/10

Sunergetic

4,222 Amazon reviews

Best for: Users seeking a high-dose magnesium oxide/citrate capsule for bone, muscle, energy, and relaxation support at a value price point

Magnesium Oxide + Magnesium Citrate 500mg · 500mg magnesium per 2-capsule serving; 60 servings per bottle

Capsule (Vegetable) · GMP manufactured; third-party testing not publicly disclosed

$16.95

$0.14/serving

Buy Nowon Amazon

#4Double Wood Magnesium Malate 1500mg

8.7/10

Double Wood Supplements

Staff Pick

3,689 Amazon reviews

Best for: People wanting a highly bioavailable magnesium form that also delivers malic acid for energy metabolism and muscle function

Magnesium Malate (magnesium bonded to malic acid) · 225mg elemental magnesium + 1,275mg malic acid per 6-capsule serving

Capsule · Third-Party Tested, Non-GMO, Vegan, Gluten-Free

$14.95

$0.12/serving

Buy Nowon Amazon

#5Sports Research Magnesium L-Threonate 2000mg with Magtein (180 Capsules)

8.5/10

Sports Research

2,173 Amazon reviews

Best for: Adults seeking a brain-targeted magnesium form that crosses the blood-brain barrier to support memory, focus, and sleep quality

Magnesium L-Threonate (as Magtein, patented MIT ingredient) — 2000mg per 4-capsule serving (144mg elemental magnesium) · 2000mg Magnesium L-Threonate (144mg elemental Mg) per 4-capsule serving, 180 capsules

Capsule · Yes — Non-GMO Project Verified, cGMP-compliant, third-party tested

$58.95

$0.33/serving

Buy Nowon Amazon

#6Sports Research Magnesium Glycinate 160mg Liquid Softgels

8.4/10

Sports Research

1,293 Amazon reviews

Best for: Adults seeking a highly bioavailable, gentle magnesium form for sleep support, stress relief, and muscle relaxation — chelated glycinate absorbs without the laxative effect of oxide forms

Magnesium Glycinate (Chelated, 160mg elemental magnesium per softgel) · 160mg chelated magnesium glycinate per softgel

Liquid Softgel · IGEN Non-GMO Tested, Gluten-Free, cGMP

$16.95

$0.28/serving

Buy Nowon Amazon

#7Nature's Bounty Magnesium Oxide 500mg

5.8/10

Nature's Bounty

94,705 Amazon reviews

Best for: Budget option (but not recommended)

Magnesium Oxide · 500mg magnesium oxide (300mg elemental Mg)

Coated Tablet · USPUSP Verified

$11.86

$0.06/serving

Buy Nowon Amazon

#	Product	Best For	Ingredient & Dose	Form & Testing	Price	Rating
1	Doctor's Best High Absorption Magnesium Glycinate #1 Top Pick 75,132 Amazon reviews	Overall / Sleep support	Magnesium Glycinate/Lysinate Chelate 200mg elemental Mg per serving	Tablet 240 Count Third-Party Tested	$20.99 $0.17/serving	9.2/10	Buy Nowon Amazon
2	Double Wood Magnesium Citrate 800mg 5,782 Amazon reviews	Budget magnesium citrate for digestive regularity	Magnesium Citrate 800mg magnesium citrate (providing ~120mg elemental magnesium) per serving	Capsules 90 Capsules Third-Party Tested, Non-GMO	$9.95 $0.11/serving	7.5/10	Buy Nowon Amazon
3	Sunergetic Magnesium Oxide Citrate 500mg 4,222 Amazon reviews	Users seeking a high-dose magnesium oxide/citrate capsule for bone, muscle, energy, and relaxation support at a value price point	Magnesium Oxide + Magnesium Citrate 500mg 500mg magnesium per 2-capsule serving; 60 servings per bottle	Capsule (Vegetable) 120 Count GMP manufactured; third-party testing not publicly disclosed	$16.95 $0.14/serving	8.4/10	Buy Nowon Amazon
4	Double Wood Magnesium Malate 1500mg Staff Pick 3,689 Amazon reviews	People wanting a highly bioavailable magnesium form that also delivers malic acid for energy metabolism and muscle function	Magnesium Malate (magnesium bonded to malic acid) 225mg elemental magnesium + 1,275mg malic acid per 6-capsule serving	Capsule 180 Count Third-Party Tested, Non-GMO, Vegan, Gluten-Free	$14.95 $0.12/serving	8.7/10	Buy Nowon Amazon
5	Sports Research Magnesium L-Threonate 2000mg with Magtein (180 Capsules) 2,173 Amazon reviews	Adults seeking a brain-targeted magnesium form that crosses the blood-brain barrier to support memory, focus, and sleep quality	Magnesium L-Threonate (as Magtein, patented MIT ingredient) — 2000mg per 4-capsule serving (144mg elemental magnesium) 2000mg Magnesium L-Threonate (144mg elemental Mg) per 4-capsule serving, 180 capsules	Capsule 180.00 Count Yes — Non-GMO Project Verified, cGMP-compliant, third-party tested	$58.95 $0.33/serving	8.5/10	Buy Nowon Amazon
6	Sports Research Magnesium Glycinate 160mg Liquid Softgels 1,293 Amazon reviews	Adults seeking a highly bioavailable, gentle magnesium form for sleep support, stress relief, and muscle relaxation — chelated glycinate absorbs without the laxative effect of oxide forms	Magnesium Glycinate (Chelated, 160mg elemental magnesium per softgel) 160mg chelated magnesium glycinate per softgel	Liquid Softgel 60 Count IGEN Non-GMO Tested, Gluten-Free, cGMP	$16.95 $0.28/serving	8.4/10	Buy Nowon Amazon
7	Nature's Bounty Magnesium Oxide 500mg 94,705 Amazon reviews	Budget option (but not recommended)	Magnesium Oxide 500mg magnesium oxide (300mg elemental Mg)	Coated Tablet 200 Count USPUSP Verified	$11.86 $0.06/serving	5.8/10	Buy Nowon Amazon

How We Chose These Products

We scored every contender on the 5weighted criteria below. Evidence quality and third-party verification carry the most weight; value, clean-label formulation, and transparency round out the score. Where tradeoffs appear — a higher-evidence form that costs more, a research-grade dose in a product with a heavier price tag, a commodity ingredient at a rock-bottom price — the pick that wins on evidence-grade criteria takes the top slot. Business partnerships never move a product's score, and lower-cost non-affiliate alternatives are included when they meet the same evidence bar.

Third-Party Testing

30%

USP, NSF, or ConsumerLab verification ensures label accuracy. Products with no third-party testing are penalized.

Dose Adequacy

25%

Does the product provide a clinically effective dose of elemental magnesium (200-400mg for most adults) per serving?

Bioavailability

20%

Glycinate, citrate, and L-threonate absorb significantly better than oxide or carbonate. We score based on published absorption data.

Value

15%

Cost per serving adjusted for bioavailability. A $0.14/serving glycinate is a better value than a $0.05/serving oxide.

Clean Label

10%

Free from unnecessary fillers, artificial colors, and common allergens. Bonus for certifications (vegan, gluten-free, non-GMO).

Detailed Reviews

#1 Top Pick

Doctor's Best High Absorption Magnesium Glycinate Lysinate Supplement for Sleep Support - Chelated Magnesium Tablets for Women & Men, 200mg per Serving, Supports Calm & Relaxation, Vegan - 240 Count

Doctor's BEST

75,132 Amazon reviews

9.2/10

(75,132)

VeganGluten-freeNon-GMOSoy-free

IngredientMagnesium Glycinate/Lysinate Chelate

Dose200mg elemental Mg per serving

FormTablet

TestingThird-Party Tested

200mg elemental Mg per servingClinical range: 200-400mg elemental magnesium daily

Therapeutic dose

$0.17/serving$20.99 · 240 Count

Ideal for: Overall / Sleep support

Not ideal for: Those who struggle swallowing large tablets

Pros

High bioavailability (glycinate chelate)
Full clinical dose (200mg elemental)
Excellent value at $0.14/serving
Over 74,000 reviews, 4.5-star average

Cons

Requires 2 tablets per serving
Tablets are relatively large

Buy Nowon Amazon

Read full Magnesium Glycinate/Lysinate Chelateguide →

Double Wood Magnesium Citrate 800mg — view 1 of 5

Magnesium Citrate 800mg, 90 Capsules, Digestion & Constipation Support, Vegan Safe, Non-GMO, Double Wood Supplements

Double Wood Supplements

5,782 Amazon reviews

7.5/10

(5,782)

Magnesium citrate is well-absorbed and has a mild laxative effect that benefits those with constipation. At 5,700+ reviews and 4.4 stars, this is one of the most consumer-validated magnesium products. Double Wood is a respected value brand.

IngredientMagnesium Citrate

Dose800mg magnesium citrate (providing ~120mg elemental magnesium) per serving

FormCapsules

TestingThird-Party Tested, Non-GMO

800mg magnesium citrate (providing ~120mg elemental magnesium) per servingClinical range: 200-400mg elemental magnesium daily

Clinical dose

$0.11/serving$9.95 · 90 Capsules

Ideal for: Budget magnesium citrate for digestive regularity

Not ideal for: Sleep support (glycinate is better) or those needing high elemental magnesium per serving

Pros

5,700+ reviews at 4.4 stars
Well-absorbed citrate form
Budget-friendly pricing
Good for digestive regularity

Cons

May cause loose stools
Lower elemental Mg per serving than glycinate
Not the best form for sleep

Buy Nowon Amazon

Read full Magnesium Citrateguide →

Premium Magnesium Citrate Capsules - Powerful 500mg Magnesium Oxide & Citrate Supplement - Helps Support Healthy Bones, Muscles, Teeth, Energy & Relaxation - 120 Vegetable Capsules

Sunergetic

4,222 Amazon reviews

8.4/10

(4,222)

One of the highest-rated magnesium supplements on Amazon with 4,222 reviews at 4.6 stars. The oxide + citrate combination provides both broad mineral supply (oxide) and better-absorbed citrate component. At $16.95 for 60 servings, value per dose is exceptional.

IngredientMagnesium Oxide + Magnesium Citrate 500mg

Dose500mg magnesium per 2-capsule serving; 60 servings per bottle

FormCapsule (Vegetable)

TestingGMP manufactured; third-party testing not publicly disclosed

500mg magnesium per 2-capsule serving; 60 servings per bottleClinical range: 200-400mg elemental magnesium daily

Clinical dose

$0.14/serving$16.95 · 120 Count

Ideal for: Users seeking a high-dose magnesium oxide/citrate capsule for bone, muscle, energy, and relaxation support at a value price point

Not ideal for: Users needing highly bioavailable forms like magnesium glycinate or threonate for specific neurological support

Pros

500mg meets adult RDA and matches clinical dose ranges for sleep and muscle support
Vegetable capsule is suitable for vegetarian and vegan users
Flagship 4,222 reviews at 4.6 stars indicates strong consumer satisfaction
120-capsule bottle at $16.95 provides excellent value per serving

Cons

Third-party testing not publicly disclosed — no published COAs on the brand site
Magnesium oxide has lower bioavailability than glycinate or threonate
May exceed supplemental UL of 350mg for sensitive users

Buy Nowon Amazon

Read full Magnesium Oxide + Magnesium Citrate 500mgguide →

Staff Pick

Double Wood Magnesium Malate 1500mg — view 1 of 3

Magnesium Malate Capsules (180 Count) - 1,500mg Per Serving (Magnesium Bonded to Malic Acid), Third Party Tested, Vegan Friendly, Gluten Free by Double Wood Supplements

Double Wood Supplements

3,689 Amazon reviews

8.7/10

(3,689)

Magnesium malate is a practical choice for active individuals prioritizing energy metabolism and muscle function — the malic acid component adds functional benefit beyond elemental magnesium alone. With 3,689 reviews at 4.6 stars and third-party testing at a competitive $14.95 price, it's a standout value in the magnesium category.

IngredientMagnesium Malate (magnesium bonded to malic acid)

Dose225mg elemental magnesium + 1,275mg malic acid per 6-capsule serving

FormCapsule

TestingThird-Party Tested, Non-GMO, Vegan, Gluten-Free

225mg elemental magnesium + 1,275mg malic acid per 6-capsule servingClinical range: 200-400mg elemental magnesium daily

Therapeutic dose

$0.12/serving$14.95 · 180 Count

Ideal for: People wanting a highly bioavailable magnesium form that also delivers malic acid for energy metabolism and muscle function

Not ideal for: Individuals using magnesium specifically for sleep support — glycinate or threonate forms have stronger evidence for sleep and relaxation

Pros

225mg elemental magnesium per serving — provides over 50% of daily magnesium intake
Malate form adds malic acid: supports ATP energy production via Krebs cycle
3,689+ reviews at 4.6 stars; 180-capsule bottle gives a 30-day supply
Third-party tested, manufactured and tested in USA, vegan and non-GMO

Cons

6 capsules per serving is a large pill burden
225mg elemental Mg doesn't fully meet daily needs as a standalone supplement
Not the best form for sleep — magnesium glycinate or threonate are preferred for relaxation

Buy Nowon Amazon

Read full Magnesium Malate (magnesium bonded to malic acid)guide →

Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption Magtein® for Enhanced Brain Health, Memory, Focus & Restful Sleep Support - Vegan · Non-GMO · Gluten Free - 180 Count

Sports Research

2,173 Amazon reviews

8.5/10

(2,173)

Vegan, gluten-free, gelatin-freeNo known food allergens in formula

Magnesium L-Threonate with Magtein is categorically different from standard magnesium supplements — it is the only form with published evidence of crossing the blood-brain barrier and increasing synaptic magnesium density. For those prioritizing cognitive health, memory, and sleep quality, Sports Research's 2000mg Magtein formula — Non-GMO Verified, vegan, and third-party tested — is the premium choice. Backed by 2,173 reviews at 4.7 stars.

IngredientMagnesium L-Threonate (as Magtein, patented MIT ingredient) — 2000mg per 4-capsule serving (144mg elemental magnesium)

Dose2000mg Magnesium L-Threonate (144mg elemental Mg) per 4-capsule serving, 180 capsules

FormCapsule

TestingYes — Non-GMO Project Verified, cGMP-compliant, third-party tested

2000mg Magnesium L-Threonate (144mg elemental Mg) per 4-capsule serving, 180 capsulesClinical range: 200-400mg elemental magnesium daily

Clinical dose

$0.33/serving$58.95 · 180.00 Count

Ideal for: Adults seeking a brain-targeted magnesium form that crosses the blood-brain barrier to support memory, focus, and sleep quality

Not ideal for: Those needing general whole-body magnesium repletion (glycinate or malate are more elemental-efficient) or those on tight supplement budgets

Pros

Magtein is the only magnesium form clinically shown to effectively cross the blood-brain barrier and raise brain magnesium levels
2000mg matches the top of the clinical dose range studied in published MIT and subsequent trials
180-capsule bottle provides a 45-day supply, reducing reorder frequency versus 90-count competitors
2,173 reviews at 4.7 stars confirms strong consumer satisfaction for this premium cognitive magnesium form

Cons

Magtein provides only 144mg of elemental magnesium per serving — inefficient for correcting whole-body magnesium deficiency
Requires 4 capsules per day, which is a higher pill burden than single-capsule alternatives
Premium-priced at $58.95 compared to standard magnesium glycinate or citrate products

Buy Nowon Amazon

Read full Magnesium L-Threonate (as Magtein, patented MIT ingredient) — 2000mg per 4-capsule serving (144mg elemental magnesium)guide →

Sports Research® Magnesium Glycinate - Supports Restful Sleep & Enzymatic Processes - 160 mg Chelated Magnesium - Liquid Softgel - 60 Count

Sports Research

1,293 Amazon reviews

8.4/10

(1,293)

Gluten-FreeSoy-FreeNon-GMO

Magnesium glycinate is the gold standard form for sleep and relaxation applications, and Sports Research's biolipid delivery system makes this one of the more bioavailable glycinate softgels available. The 4.7-star average on 1,293 reviews for a product launched in April 2024 is an impressive early trajectory, validating the clean formulation and effective delivery format.

IngredientMagnesium Glycinate (Chelated, 160mg elemental magnesium per softgel)

Dose160mg chelated magnesium glycinate per softgel

FormLiquid Softgel

TestingIGEN Non-GMO Tested, Gluten-Free, cGMP

160mg chelated magnesium glycinate per softgelClinical range: 200-400mg elemental magnesium daily

Partial dose

$0.28/serving$16.95 · 60 Count

Ideal for: Adults seeking a highly bioavailable, gentle magnesium form for sleep support, stress relief, and muscle relaxation — chelated glycinate absorbs without the laxative effect of oxide forms

Not ideal for: Users needing high elemental magnesium per capsule — at 160mg per softgel, those with significant magnesium deficiency may need multiple softgels or a higher-dose form

Pros

Chelated glycinate form has superior absorption and zero laxative effect compared to oxide or citrate
GABA-stimulating mechanism of magnesium glycinate specifically supports sleep quality and relaxation
Biolipid delivery matrix (MCT oil + sunflower lecithin) further optimizes absorption
4.7-star average across 1,293 reviews — strong and growing social proof for a mid-2024 launch

Cons

160mg per softgel requires two softgels to reach the low end of clinical sleep-research dosing (200mg+)
60-count bottle is only a 1-month supply at two-softgel therapeutic dosing
No IFOS or NSF Certified for Sport testing — not verified for competitive athletes subject to anti-doping rules

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Nature's Bounty Magnesium 500 mg Tablets, High Potency Magnesium Supplement for Bone & Muscle Health, Whole Body Support, 200 Count (Pack of 1)

Nature's Bounty

94,705 Amazon reviews

5.8/10

(94,705)

Gluten-free

USP Verified and incredibly affordable at $0.04/serving. Widely available at every pharmacy. The 500mg label dose delivers 300mg elemental magnesium. We include it to explain why oxide is not our recommendation despite its popularity.

IngredientMagnesium Oxide

Dose500mg magnesium oxide (300mg elemental Mg)

FormCoated Tablet

TestingUSP Verified

500mg magnesium oxide (300mg elemental Mg)Clinical range: 200-400mg elemental magnesium daily

Clinical dose

$0.06/serving$11.86 · 200 Count

Ideal for: Budget option (but not recommended)

Not ideal for: Anyone seeking actual magnesium absorption rather than label dose

Pros

USP Verified
Cheapest option ($0.04/serving)
High elemental dose on paper (300mg)
Available at every pharmacy

Cons

Only 4% bioavailability (worst of all forms)
Causes diarrhea in many users
Inferior to glycinate/citrate in clinical trials
~96% passes through unabsorbed

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Pairs Well With

Frequently taken together based on complementary benefits

Zinc

Sunergetic Elderberry Gummies Vitamin C Zinc

2 gummies daily

(637)$0.33/serving

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Vitamin D3

Sports Research Vitamin D3 5000 IU with Coconut MCT Oil

5000 IU (125 mcg) per softgel with cold-pressed virgin coconut oil

(71,366)$0.30/serving

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How to Choose

Choose the Right Form for Your Goal

Magnesium glycinate absorbs 4-5x better than oxide and is the best all-around form — ideal for sleep, stress, and general supplementation. Magnesium citrate is well-absorbed and has an osmotic laxative effect, making it the top choice for constipation. Magnesium L-threonate is the only form clinically shown to cross the blood-brain barrier (MIT, 2010), making it best for cognitive function. Avoid magnesium oxide — its 4% bioavailability means 96% passes through unabsorbed.

Check the Elemental Magnesium Dose

The label dose and the actual magnesium dose are different. "500mg magnesium glycinate" contains only ~70mg of elemental magnesium. Look for "elemental magnesium" on the Supplement Facts panel — this is the number that matters. Most adults need 200-400mg of elemental magnesium per day. The tolerable upper limit from supplements is 350mg.

Verify Third-Party Testing

USP Verified is the gold standard — it guarantees the product contains what the label says and dissolves properly. NSF Certified for Sport goes further by testing for 200+ banned substances. ConsumerLab independently purchases and tests products. Products with no third-party testing have no guarantee of label accuracy — a 2019 study found 25% of magnesium supplements failed label claims.

Who Should Avoid Magnesium Supplements

People with kidney disease should not supplement magnesium without medical supervision, as impaired kidneys cannot excrete excess magnesium. Those taking antibiotics (tetracyclines, fluoroquinolones) should space magnesium 2+ hours apart, as it can bind and reduce antibiotic absorption. Magnesium can also interact with bisphosphonates, blood pressure medications, and muscle relaxants.

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Doctor's Best High Absorption Magnesium Glycinate

9.2/10$0.17/servingBest for: Overall / Sleep support

The best magnesium supplement is a glycinate product providing 200-400mg elemental magnesium with USP or NSF third-party testing, costing under $0.20 per serving.

Evidence:Animal (2019) · low confidence[#1]

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Related Comparisons

Magnesium Glycinate vs CitrateRead the full head-to-head breakdown →

Read Our Full Magnesium Research Guide

Evidence level, dosage, side effects, and more →

Already taking supplements?

Check how Magnesium fits with your current stack — interactions, timing, and optimization →

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Related Conditions

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Frequently Asked Questions

What is the best magnesium supplement to buy?

The best magnesium supplement for most people is a glycinate product providing 200-400mg elemental magnesium with third-party testing, such as Doctor's Best Magnesium Glycinate ($0.14/serving). For sleep, choose glycinate. For constipation, choose citrate. For brain health, choose L-threonate.

What is the best form of magnesium?

Magnesium glycinate is the best form for general use and sleep — organic salts absorb substantially better than oxide (fractional absorption ~4% for oxide) ^[6] and rarely cause GI side effects ^[1]. Magnesium citrate is best for constipation relief. Magnesium L-threonate is the only form proven to cross the blood-brain barrier, making it best for cognitive function.

Evidence:Animal (2019) · low confidence[#1]

How much magnesium should I take per day?

The RDA for magnesium is 310-420mg per day for adults, depending on age and sex. Most clinical trials use 200-400mg of elemental magnesium. The tolerable upper limit from supplements is 350mg. Start at 200mg and increase gradually to avoid GI side effects.

When should I take magnesium?

Take magnesium 30-60 minutes before bed if using it for sleep. For general supplementation, take it with a meal to improve absorption and reduce stomach discomfort. Magnesium citrate for constipation works best on an empty stomach with a full glass of water.

Is magnesium glycinate better than magnesium citrate?

Magnesium glycinate is better for sleep and general supplementation because it absorbs well without GI side effects. Magnesium citrate is better for constipation relief due to its osmotic laxative effect. Both are well-absorbed — citrate is cheaper, glycinate is gentler.

Can you take too much magnesium?

Yes. The tolerable upper limit for supplemental magnesium is 350mg per day. Excess magnesium causes diarrhea, nausea, and cramping. In rare cases, extremely high doses can cause irregular heartbeat. Magnesium from food does not need to be limited — only supplemental magnesium.

Does magnesium help with anxiety?

Moderate evidence supports magnesium for anxiety reduction. A 2017 systematic review (Boyle et al.) found magnesium supplementation reduced subjective anxiety in mildly anxious individuals. Magnesium glycinate and magnesium taurate are the forms most commonly recommended for anxiety.

What are signs of magnesium deficiency?

Common signs of magnesium deficiency include muscle cramps, fatigue, irritability, poor sleep, and heart palpitations. Up to 50% of Americans consume less than the recommended amount. Risk factors include diabetes, alcohol use, digestive disorders, and older age.

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References

AnimalUysal N, Kizildag S, Yuce Z, et al. (2019). Timeline (Bioavailability) of Magnesium Compounds in Hours: Which Magnesium Compound Works Best?. Biological Trace Element Research. DOI PubMed
Slutsky I, Abumaria N, Wu LJ, et al. (2010). Enhancement of Learning and Memory by Elevating Brain Magnesium. Neuron. DOI PubMed
Abbasi B, Kimiagar M, Sadeghniiat K, et al. (2012). The effect of magnesium supplementation on primary insomnia in elderly. Journal of Research in Medical Sciences. PubMed
Boyle NB, Lawton C, Dye L (2017). The Effects of Magnesium Supplementation on Subjective Anxiety and Stress. Nutrients. DOI PubMed
ReviewRanade VV, Somberg JC (2001). Bioavailability and Pharmacokinetics of Magnesium After Administration of Magnesium Salts to Humans. American Journal of Therapeutics. DOI PubMed
ObservationalFiroz M, Graber M (2001). Bioavailability of US commercial magnesium preparations. Magnesium Research. PubMed
Schwalfenberg GK, Genuis SJ (2017). The Importance of Magnesium in Clinical Healthcare. Scientifica. DOI PubMed

Show 1 more reference

Mah J, Pitre T (2021). Oral magnesium supplementation for insomnia in older adults: a systematic review & meta-analysis. BMC Complementary Medicine and Therapies. DOI PubMed