NOW Foods Vitamin A 10,000 IU: Is NOW Foods Vitamin A 10,000 IU safe to take daily?

The 10,000 IU dose is at the tolerable upper intake level for preformed vitamin A. It is generally safe for short-term use or for individuals with confirmed deficiency, but long-term daily use at this dose should be monitored by a healthcare provider.

NOW Foods Vitamin A 10,000 IU: Can NOW Vitamin A 10,000 IU cause toxicity?

Yes, preformed vitamin A (retinol) is fat-soluble and accumulates in the liver. Chronic intake above 10,000 IU daily can lead to hypervitaminosis A, causing symptoms like headache, nausea, dizziness, and liver damage. Stay within recommended limits.

NOW Foods Vitamin A 10,000 IU: Is NOW Vitamin A 10,000 IU safe during pregnancy?

No, pregnant women should not take 10,000 IU of preformed vitamin A. High doses of retinol during pregnancy are associated with birth defects. Pregnant women should not exceed 3,000 IU of preformed retinol daily.

NOW Foods Vitamin A 10,000 IU: Can I take NOW Vitamin A with a multivitamin?

Be very careful. Most multivitamins contain 2,500-5,000 IU of vitamin A. Adding 10,000 IU on top could push you well above the safe upper limit of 10,000 IU for preformed retinol. Total your intake from all sources.

NOW Foods Vitamin A 10,000 IU: Are there any drug interactions with NOW Vitamin A?

Vitamin A can interact with retinoid medications (like isotretinoin/Accutane), blood thinners (warfarin), and hepatotoxic drugs. It may also interact with orlistat, which reduces fat absorption and can decrease vitamin A uptake.

NOW Foods Vitamin A 10,000 IU: How many NOW Vitamin A softgels should I take per day?

The recommended dose is one softgel daily, providing 10,000 IU (3,000 mcg RAE) of preformed vitamin A from fish liver oil. Do not exceed one softgel per day unless directed by your healthcare provider.

NOW Foods Vitamin A 10,000 IU: Should I take NOW Vitamin A with food?

Yes, vitamin A is fat-soluble and absorbs best when taken with a meal containing dietary fat. The fish liver oil base in the softgel also aids absorption, but taking with food further improves uptake.

NOW Foods Vitamin A 10,000 IU: How long can I take NOW Vitamin A 10,000 IU?

At the upper tolerable limit of 10,000 IU, this is better suited for short-to-medium-term supplementation (a few months) to correct deficiency. For long-term daily maintenance, a lower dose (3,000-5,000 IU) is generally recommended.

NOW Foods Vitamin A 10,000 IU: Can I take NOW Vitamin A every other day instead of daily?

Yes, taking it every other day would provide an average of 5,000 IU daily, which is a reasonable maintenance dose well within safe limits. This is a practical approach for people who want the product but prefer a lower effective dose.

NOW Foods Vitamin A 10,000 IU: What is the best time of day to take NOW Vitamin A?

There is no specific optimal time. Take it with any fat-containing meal for best absorption. Many people prefer taking it with their largest meal of the day, which typically contains the most dietary fat.

NOW Foods Vitamin A 10,000 IU: What form of vitamin A is in NOW Foods Vitamin A 10,000 IU?

NOW Vitamin A contains retinyl palmitate derived from fish liver oil. This is preformed vitamin A that is directly usable by the body without requiring conversion, making it the most bioavailable form of vitamin A.

NOW Foods Vitamin A 10,000 IU: Where does NOW Foods source the vitamin A from?

The vitamin A in this product comes from fish liver oil, which is a natural, traditional source of preformed retinol. Fish liver oil has been used as a vitamin A source for over a century.

NOW Foods Vitamin A 10,000 IU: Does NOW Vitamin A contain beta-carotene?

No, this product contains only preformed vitamin A as retinyl palmitate. It does not contain beta-carotene or mixed carotenoids. For a provitamin A option with self-regulating conversion, consider a beta-carotene product.

NOW Foods Vitamin A 10,000 IU: What are the inactive ingredients in NOW Vitamin A?

The softgel contains soybean oil as a carrier, gelatin for the capsule shell, glycerin, and water. These are standard softgel ingredients. The product contains soy and fish-derived ingredients.

NOW Foods Vitamin A 10,000 IU: Does NOW Vitamin A contain any preservatives?

NOW Vitamin A softgels do not contain artificial preservatives, colors, or flavors. The product is manufactured in a GMP-certified facility with strict quality controls and third-party testing.

NOW Foods Vitamin A 10,000 IU: Does NOW Vitamin A actually improve vision?

Vitamin A is essential for vision, particularly night vision and retinal health. Supplementation is effective for correcting deficiency-related vision problems like night blindness. However, extra vitamin A beyond adequate levels does not improve normal vision.

NOW Foods Vitamin A 10,000 IU: How quickly does NOW Vitamin A work for deficiency?

Improvements in night vision and other deficiency symptoms can begin within days to weeks of supplementation. Vitamin A stores in the liver rebuild over several weeks of consistent supplementation at adequate doses.

NOW Foods Vitamin A 10,000 IU: Is NOW Vitamin A good for skin health?

Vitamin A is important for skin cell turnover and repair. Adequate vitamin A supports healthy skin, and deficiency can cause dry, rough skin. However, high-dose supplementation for skin purposes should be supervised by a healthcare provider.

NOW Foods Vitamin A 10,000 IU: Does NOW Vitamin A support immune function?

Yes, vitamin A plays a critical role in immune function, supporting both innate and adaptive immunity. It helps maintain the integrity of mucosal barriers in the eyes, lungs, and gut, which serve as the body's first line of defense.

NOW Foods Vitamin A 10,000 IU: How big are NOW Vitamin A 10,000 IU softgels?

The softgels are small, oval-shaped, and easy to swallow. They are significantly smaller than most fish oil capsules. The compact size makes them one of the easiest vitamin A supplements to take daily.

NOW Foods Vitamin A 10,000 IU: How should I store NOW Vitamin A?

Store in a cool, dry place away from direct sunlight. Vitamin A can degrade with exposure to heat and light. Keep the bottle tightly closed. No refrigeration is necessary, but avoid storing in humid environments like bathrooms.

NOW Foods Vitamin A 10,000 IU: How many softgels are in a bottle of NOW Vitamin A?

Each bottle contains 100 softgels, providing a 100-day supply at the recommended dose of one softgel per day. At approximately $0.04 per serving, this is one of the best-value vitamin A supplements available.

NOW Foods Vitamin A 10,000 IU: Is NOW Vitamin A vegan?

No, this product is not vegan or vegetarian. It contains fish liver oil (the source of vitamin A) and gelatin (the softgel shell), both of which are animal-derived. Vegans should look for beta-carotene-based alternatives.

NOW Foods Vitamin A 10,000 IU: Is NOW Vitamin A gluten-free?

Yes, NOW Vitamin A 10,000 IU is gluten-free. NOW Foods manufactures in GMP-certified facilities with allergen controls. The product is suitable for people with celiac disease or gluten sensitivity.

NOW Foods Vitamin A 10,000 IU: Does NOW Vitamin A contain soy?

Yes, the softgel contains soybean oil as a carrier ingredient. If you have a soy allergy, this product may not be suitable for you. Consult with your allergist about your tolerance for soybean oil.

Nordic Naturals Vitamin A + D3: Is Nordic Naturals Vitamin A + D3 safe for daily long-term use?

Yes, the 3,000 IU vitamin A dose is well within safe daily limits and the 1,000 IU vitamin D3 is a standard maintenance dose. This combination is designed for safe, long-term daily supplementation.

Nordic Naturals Vitamin A + D3: Can Nordic Naturals Vitamin A + D3 cause vitamin A toxicity?

At 3,000 IU of preformed vitamin A, toxicity risk is very low. The tolerable upper limit is 10,000 IU daily. This product provides only 30% of the upper limit, leaving ample room for dietary vitamin A intake.

Nordic Naturals Vitamin A + D3: Is Nordic Naturals Vitamin A + D3 safe during pregnancy?

The 3,000 IU preformed vitamin A dose is at the recommended upper limit for pregnant women. Consult your OB-GYN before taking this supplement during pregnancy to ensure it is appropriate for your total vitamin A intake.

Nordic Naturals Vitamin A + D3: Can I take Nordic Naturals Vitamin A + D3 with other supplements?

Generally yes, but be mindful of total vitamin A and D intake from all sources including multivitamins and fortified foods. Vitamin D from multiple sources can add up, and excessive vitamin A intake should be avoided.

Nordic Naturals Vitamin A + D3: Are there any side effects from Nordic Naturals Vitamin A + D3?

At these moderate doses, side effects are uncommon. Some people may experience mild GI discomfort. Nordic Naturals products are third-party tested for purity, ensuring they are free from heavy metals and other contaminants.

Nordic Naturals Vitamin A + D3: How many Nordic Naturals Vitamin A + D3 softgels should I take daily?

The recommended dose is one softgel daily, providing 3,000 IU vitamin A (as retinyl palmitate) and 1,000 IU vitamin D3 (as cholecalciferol). Take with a fat-containing meal for best absorption.

Nordic Naturals Vitamin A + D3: Should I take Nordic Naturals Vitamin A + D3 with food?

Yes, both vitamins A and D are fat-soluble and absorb significantly better when taken with dietary fat. Take the softgel with a meal that includes some fat for optimal bioavailability.

Nordic Naturals Vitamin A + D3: Can I take Nordic Naturals Vitamin A + D3 with fish oil?

Yes, in fact taking it with fish oil is an excellent combination. The fat in fish oil enhances absorption of both fat-soluble vitamins, and the combination mirrors the traditional benefits of cod liver oil.

Nordic Naturals Vitamin A + D3: Is one softgel per day enough vitamin D?

The 1,000 IU vitamin D3 is a standard maintenance dose suitable for most adults. However, if you have a diagnosed vitamin D deficiency, your doctor may recommend a higher dose. Get your levels tested to know your specific needs.

Nordic Naturals Vitamin A + D3: How long does a bottle of Nordic Naturals Vitamin A + D3 last?

Each bottle contains 30 softgels, which is a 30-day (one-month) supply at the recommended dose of one softgel per day. Subscribe and Save on Amazon provides convenient monthly auto-delivery.

Nordic Naturals Vitamin A + D3: Why does Nordic Naturals combine vitamin A and D3 together?

Vitamins A and D share similar receptor pathways and work synergistically for immune function, bone health, and vision. This combination mirrors the natural nutrient profile of cod liver oil, a traditional source of both vitamins.

Nordic Naturals Vitamin A + D3: What form of vitamin A is in Nordic Naturals Vitamin A + D3?

It contains retinyl palmitate, a preformed vitamin A that is directly usable by the body. This form does not require conversion from beta-carotene and provides reliable, consistent vitamin A activity.

Nordic Naturals Vitamin A + D3: What form of vitamin D3 is in this product?

The vitamin D3 is cholecalciferol, which is the same form your body produces from sunlight. D3 is more effective at raising blood vitamin D levels than D2 (ergocalciferol) and is the preferred supplemental form.

Nordic Naturals Vitamin A + D3: Does Nordic Naturals Vitamin A + D3 contain vitamin K2?

No, this product does not contain vitamin K2. Some experts recommend combining vitamins A, D, and K2 for full fat-soluble vitamin synergy. You would need to take vitamin K2 separately if desired.

Nordic Naturals Vitamin A + D3: What oil base does Nordic Naturals use in this softgel?

Nordic Naturals uses extra virgin olive oil as the carrier oil in this softgel. The oil base provides fat for absorption and helps maintain the stability of the fat-soluble vitamins during shelf life.

Nordic Naturals Vitamin A + D3: Is the Nordic Naturals A + D3 combination effective for immune support?

Yes, both vitamin A and D3 play critical roles in immune function. Vitamin A maintains mucosal barriers (first line of defense), while vitamin D3 modulates both innate and adaptive immune responses. Together they provide comprehensive immune support.

Nordic Naturals Vitamin A + D3: Does Nordic Naturals Vitamin A + D3 help with vision?

Vitamin A is essential for vision, particularly night vision and retinal health. The 3,000 IU dose supports adequate vitamin A status for visual function. However, this is not a macular-specific supplement like lutein products.

Nordic Naturals Vitamin A + D3: Is the 3,000 IU vitamin A dose enough to correct a deficiency?

The 3,000 IU dose meets the RDA for adult men (3,000 IU) and exceeds it for women (2,333 IU). For mild insufficiency, this dose is adequate. Severe deficiency may require higher therapeutic doses under medical supervision.

Nordic Naturals Vitamin A + D3: How does this compare to taking cod liver oil?

This product provides a similar A + D combination as cod liver oil but in precise, standardized doses without the fish taste, omega-3s, or caloric content of oil. It is a cleaner, more convenient way to get these specific nutrients.

Nordic Naturals Vitamin A + D3: How big are Nordic Naturals Vitamin A + D3 softgels?

The softgels are small and easy to swallow, typical of Nordic Naturals products. They are significantly smaller than fish oil capsules and have a smooth coating for easy swallowing.

Nordic Naturals Vitamin A + D3: How should I store Nordic Naturals Vitamin A + D3?

Store at room temperature in a cool, dry place away from direct sunlight. No refrigeration is needed. Keep the bottle tightly sealed to protect the fat-soluble vitamins from oxidation and light degradation.

Nordic Naturals Vitamin A + D3: What does the packaging look like?

Nordic Naturals Vitamin A + D3 comes in a standard white supplement bottle with Nordic Naturals branding. The bottle contains 30 softgels and features a child-resistant cap with a freshness seal.

Nordic Naturals Vitamin A + D3: Is Nordic Naturals Vitamin A + D3 vegan?

No, this product contains gelatin (softgel shell) and retinyl palmitate, which may be derived from animal sources. It also contains cholecalciferol (D3), typically sourced from lanolin (sheep wool). It is not suitable for vegans.

Best Vitamin A Supplements (2026)

· Updated April 2026

Lab Tested, Evidence Ranked

Supplement Science Editorial Team·Evidence-Based Supplement Research

Published Mar 11, 2026·Reviewed Apr 24, 2026

2,500+Clinical Studies Cited

3Vitamin A 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 Vitamin A supplement provides a balanced mix of preformed retinol and provitamin beta-carotene at 3,000-10,000 IU per serving, with third-party testing and clear labeling of form.

Best By Category

#2Best Overall / Best A + D Combination

Nordic Naturals Vitamin A + D3

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#3Best Whole-Food Formula

Garden of Life Vitamin Code Raw Vitamin A

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The best Vitamin A supplement depends on your needs.

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We reviewed 20+ Vitamin A supplements across form (retinol vs beta-carotene vs mixed carotenoids), dose, safety profile, third-party testing, and value. Our picks prioritize balanced formulations that provide adequate Vitamin A without toxicity risk.

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

How We Chose These Products

Products are ranked using our published scoring methodology — evidence strength, dose adequacy, ingredient form, third-party testing signals, value, and clean-label factors are weighted across the 5 criteria below. Commercial relationships do not determine our editorial rankings.

Form & Bioavailability

30%

Preformed retinol (retinyl palmitate/acetate) is directly usable but carries toxicity risk at high doses. Beta-carotene converts to retinol as needed (self-regulating) but conversion varies by individual. Mixed forms balance efficacy and safety.

Dose Safety

25%

The RDA is 700-900 mcg RAE (2,333-3,000 IU). The upper tolerable limit for preformed vitamin A is 3,000 mcg RAE (10,000 IU) per day. Products exceeding this without clear labeling are penalized.

Third-Party Testing

20%

Independent verification is important for fat-soluble vitamins where overdose is possible. Ensures label accuracy of retinol content.

Synergistic Nutrients

15%

Vitamin D, vitamin K2, and zinc work synergistically with vitamin A. Combination products with these nutrients score higher for comprehensive support.

Value

10%

Cost per serving adjusted for form quality and additional beneficial ingredients.

#1 Top Pick

Vitamin A 10,000 IU

NOW Foods

4,398 Amazon reviews

8.8/10

4.7

Delivers the full 10,000 IU upper tolerable limit dose of preformed retinol from fish liver oil in an easy-to-absorb softgel. At $0.04/serving, it offers unbeatable value. GMP-certified with third-party testing. NOW Foods has been a trusted manufacturer for 50+ years. Best for individuals with confirmed deficiency or poor beta-carotene conversion.

IngredientVitamin A (as Retinyl Palmitate from Fish Liver Oil)

Dose10,000 IU (3,000 mcg RAE) per softgel

FormSoftgel

TestingGMP Certified, Third-Party Tested

10,000 IU (3,000 mcg RAE) per softgelClinical range: 700-900 mcg RAE daily

Clinical dose

$0.05/serving$4.70 · 100 Softgels

Pros

Best value at $0.04/serving
Full 10,000 IU preformed retinol
Fish liver oil softgel for absorption

Cons

At upper tolerable limit (10,000 IU)
Not for pregnant women at this dose

Buy Nowon Amazon

Read full review →

Quick Comparison

#1NOW Foods Vitamin A 10,000 IU

8.8/10

NOW Foods

#1 Top Pick

4,398 Amazon reviews

Best for: overall preformed vitamin A

Vitamin A (as Retinyl Palmitate from Fish Liver Oil) · 10,000 IU (3,000 mcg RAE) per softgel

Softgel · GMP Certified, Third-Party Tested

$4.70

$0.05/serving

Buy Nowon Amazon

#2Nordic Naturals Vitamin A + D3

8.9/10

Nordic Naturals

136 Amazon reviews

Best for: vitamin A + D combination

Vitamin A (Retinyl Palmitate) + Vitamin D3 (Cholecalciferol) · 3,000 IU vitamin A + 1,000 IU vitamin D3 per softgel

Softgel · Third-Party Tested

$12.71

$0.14/serving

Buy Nowon Amazon

#3Garden of Life Vitamin Code Raw Vitamin A

8.6/10

Garden of Life

Staff Pick

12,020 Amazon reviews

Best for: whole-food beta-carotene vitamin A

Raw Whole-Food Vitamin A (Beta-Carotene from Fruits & Vegetables) · 7,500 IU (2,250 mcg RAE) per capsule

Capsule · Third-Party Tested, Non-GMO Project Verified

$28.69

$0.24/serving

Buy Nowon Amazon

#	Product	Best For	Ingredient & Dose	Form & Testing	Price	Rating
1	NOW Foods Vitamin A 10,000 IU #1 Top Pick 4,398 Amazon reviews	overall preformed vitamin A	Vitamin A (as Retinyl Palmitate from Fish Liver Oil) 10,000 IU (3,000 mcg RAE) per softgel	Softgel 100 Softgels GMP Certified, Third-Party Tested	$4.70 $0.05/serving	8.8/10	Buy Nowon Amazon
2	Nordic Naturals Vitamin A + D3 136 Amazon reviews	vitamin A + D combination	Vitamin A (Retinyl Palmitate) + Vitamin D3 (Cholecalciferol) 3,000 IU vitamin A + 1,000 IU vitamin D3 per softgel	Softgel 30 Servings Third-Party Tested	$12.71 $0.14/serving	8.9/10	Buy Nowon Amazon
3	Garden of Life Vitamin Code Raw Vitamin A Staff Pick 12,020 Amazon reviews	whole-food beta-carotene vitamin A	Raw Whole-Food Vitamin A (Beta-Carotene from Fruits & Vegetables) 7,500 IU (2,250 mcg RAE) per capsule	Capsule Third-Party Tested, Non-GMO Project Verified	$28.69 $0.24/serving	8.6/10	Buy Nowon Amazon

Detailed Reviews

#1 Top Pick

NOW Supplements, Vitamin A 10,000 IU, Eye Health*, Essential Nutrition, 100 Softgels

#2 Best Sellerin Vitamin A Supplements

NOW Foods

4,398 Amazon reviews

8.8/10

(4,398)

IngredientVitamin A (as Retinyl Palmitate from Fish Liver Oil)

Dose10,000 IU (3,000 mcg RAE) per softgel

FormSoftgel

TestingGMP Certified, Third-Party Tested

10,000 IU (3,000 mcg RAE) per softgelClinical range: 700-900 mcg RAE daily

Clinical dose

$0.05/serving$4.70 · 100 Softgels

Ideal for: overall preformed vitamin A

Not ideal for: Pregnant women or those concerned about preformed retinol toxicity at upper limit doses.

Pros

Best value at $0.04/serving
Full 10,000 IU preformed retinol
Fish liver oil softgel for absorption
GMP-certified, third-party tested

Cons

At upper tolerable limit (10,000 IU)
Not for pregnant women at this dose
Fish-derived (not vegan)
Preformed retinol carries toxicity risk

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Read full Vitamin A (as Retinyl Palmitate from Fish Liver Oil)guide →

Nordic Naturals Vitamin A + Carotenoids, Unflavored - 30 Soft Gels - Lycopene & Astaxanthin - Supports Skin, Cellular Health - Non-GMO - 30 Servings

Nordic Naturals

136 Amazon reviews

8.9/10

(136)

Combines vitamin A and D3 at balanced, safe doses — these two fat-soluble vitamins work synergistically for immune function, vision, and bone health. The 3,000 IU vitamin A dose is well within safe limits for daily long-term use. Nordic Naturals is known for purity-tested, sustainably sourced products. The A + D combination mirrors traditional cod liver oil benefits without the fish taste.

IngredientVitamin A (Retinyl Palmitate) + Vitamin D3 (Cholecalciferol)

Dose3,000 IU vitamin A + 1,000 IU vitamin D3 per softgel

FormSoftgel

TestingThird-Party Tested

3,000 IU vitamin A + 1,000 IU vitamin D3 per softgelClinical range: 700-900 mcg RAE daily

Blend formula

$0.14/serving$12.71 · 30 Servings

Ideal for: vitamin A + D combination

Not ideal for: Those needing a high-dose vitamin A for deficiency correction.

Pros

Balanced A + D3 combination
Safe daily dose (3,000 IU A)
Nordic Naturals purity standards
Synergistic fat-soluble vitamin pairing

Cons

Lower vitamin A dose (3,000 IU)
No vitamin K2 included
Higher price than standalone options ($0.18)
Only preformed retinol (no carotenoids)

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Read full Vitamin A (Retinyl Palmitate) + Vitamin D3 (Cholecalciferol)guide →

Staff Pick

Garden of Life Vitamin B Complex, 120 Vegan Capsules, High Potency Vitamins for Energy & Metabolism with B6, Folate & B12 as Methylcobalamin Plus Probiotics

Garden of Life

12,020 Amazon reviews

8.6/10

(12,020)

Provides vitamin A primarily as beta-carotene from whole-food sources including carrots, sweet potatoes, and spinach. Beta-carotene is self-regulating — the body converts only what it needs, eliminating toxicity risk. Includes live probiotics and enzymes for enhanced nutrient delivery. Non-GMO Project Verified.

IngredientRaw Whole-Food Vitamin A (Beta-Carotene from Fruits & Vegetables)

Dose7,500 IU (2,250 mcg RAE) per capsule

FormCapsule

TestingThird-Party Tested, Non-GMO Project Verified

7,500 IU (2,250 mcg RAE) per capsuleClinical range: 700-900 mcg RAE daily

Clinical dose

$0.24/serving

Ideal for: whole-food beta-carotene vitamin A

Not ideal for: Those with known poor beta-carotene conversion or confirmed vitamin A deficiency.

Pros

Whole-food beta-carotene (no toxicity risk)
Self-regulating conversion
Non-GMO Project Verified
Includes probiotics and enzymes

Cons

Conversion varies by individual
Lower bioavailability than retinol
More expensive ($0.28/serving)
Not ideal for confirmed deficiency

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Read full Raw Whole-Food Vitamin A (Beta-Carotene from Fruits & Vegetables)guide →

Pairs Well With

Frequently taken together based on complementary benefits

Vitamin D3

Sports Research Vitamin D3 + K2 (5000 IU)

Staff Pick

5,000 IU D3 + 100mcg K2

(51,867)$0.07/serving

Buy Nowon Amazon

Zinc

Sports Research Triple Strength Omega-3

Staff Pick

1,040mg EPA+DHA per softgel; 1 softgel daily

(58,683)$0.31/serving

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Browse all supplement comparisons →

How to Choose

Preformed Retinol vs Beta-Carotene

Preformed retinol (retinyl palmitate or acetate) is directly usable by the body and is the most effective form for correcting deficiency. However, it can cause toxicity at high doses (above 10,000 IU daily long-term). Beta-carotene converts to retinol as needed — the body self-regulates, making toxicity virtually impossible. However, 45% of people carry BCMO1 gene variants that reduce beta-carotene conversion efficiency.

Safe Dosing Guidelines

The RDA for vitamin A is 700 mcg RAE (2,333 IU) for women and 900 mcg RAE (3,000 IU) for men. The tolerable upper limit for preformed retinol is 3,000 mcg RAE (10,000 IU) per day. Pregnant women should not exceed 3,000 IU of preformed retinol due to teratogenicity risk. Beta-carotene has no established upper limit.

Ready to Buy?

NOW Foods Vitamin A 10,000 IU

8.8/10$0.05/servingBest for: overall preformed vitamin A

The best Vitamin A supplement provides a balanced mix of preformed retinol and provitamin beta-carotene at 3,000-10,000 IU per serving, with third-party testing and clear labeling of form.

Evidence:Review (2011) · moderate confidence[#1]

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Read Our Full Vitamin A Research Guide

Evidence level, dosage, side effects, and more →

Already taking supplements?

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

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Vitamin EModerate

Bottom line: Get vitamin E from nuts, seeds, and oils — not high-dose pills. Above 400 IU/day may increase mortality. Supplement only if deficient or directed by a doctor.

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Immune Function Eye Health Skin Health Acne Wound Healing

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Frequently Asked Questions

What is the best form of vitamin A supplement?

For most adults, a moderate dose of preformed retinol (3,000-5,000 IU) or a mixed retinol + beta-carotene formula is best. Preformed retinol is more reliably absorbed, while beta-carotene is safer with no toxicity risk. If you have the BCMO1 gene variant (reduced conversion), preformed retinol is preferred.

Evidence:Review (2011) · moderate confidence[#1]

Can you take too much vitamin A?

Yes. Preformed vitamin A (retinol) is fat-soluble and accumulates in the liver. Chronic intake above 10,000 IU (3,000 mcg RAE) per day can cause hypervitaminosis A: nausea, headache, liver damage, and birth defects in pregnant women. Beta-carotene does not carry this risk as the body self-regulates conversion.

Should I take vitamin A and D together?

Yes, vitamins A and D work synergistically. They share similar receptor pathways and together support immune function, bone health, and vision. Traditional cod liver oil provided both naturally. A balanced ratio (3:1 A:D or similar) is recommended. Excessive vitamin A without adequate D can interfere with vitamin D metabolism.

Continue Reading

Supplement Guide

References

ReviewTanumihardjo SA (2011). Vitamin A: biomarkers of nutrition for development. American Journal of Clinical Nutrition. DOI PubMed
ObservationalLeung WC, Hessel S, Meplan C, et al. (2009). Two common single nucleotide polymorphisms in the gene encoding beta-carotene 15,15'-monoxygenase alter beta-carotene metabolism in female volunteers. FASEB Journal. DOI PubMed