We evaluated 30 vitamin B12 supplements across form (methylcobalamin vs cyanocobalamin), dose, delivery method, third-party testing, and value. Our picks prioritize bioactive forms and sublingual delivery for optimal absorption.
Best Vitamin B12 Supplements (2026)
This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer
Our Verdict
The best B12 supplement uses methylcobalamin or adenosylcobalamin at 1,000-2,000mcg in a sublingual lozenge for direct bloodstream absorption.
Best By Category
TL;DR — Quick Answer
The best B12 supplement for most people is a methylcobalamin sublingual lozenge providing 1,000-2,000mcg per serving. Methylcobalamin is the active, coenzyme form that bypasses the conversion step required by cheaper cyanocobalamin.
Our recommendations are based on published research, not commission rates. Some links below are affiliate links — we may earn a commission at no extra cost to you. How we evaluate products
5+ products evaluated · Ratings based on published research, not commissions
Quick Comparison
#1Jarrow Formulas Methyl B-12 1000mcg
9.3/10
Jarrow Formulas
Best for: Overall best methylcobalamin sublingual
Methylcobalamin · 1,000mcg methylcobalamin per lozenge
Sublingual Lozenge · Third-Party Tested
$0.07
#2Nature Made Vitamin B12 1000mcg
8.6/10
Nature Made
Best for: USP-verified budget option
Cyanocobalamin · 1,000mcg cyanocobalamin per softgel
Softgel · USPUSP Verified
$0.05
#3Garden of Life mykind Organics B-12 Spray
8.8/10
Garden of Life
Best for: Vegans and whole-food sourced B12
Methylcobalamin (Whole-Food) · 500mcg methylcobalamin per spray
Oral Spray · Third-Party Tested, Non-GMO Project Verified
$0.18
#4Thorne Methylcobalamin (Methyl B12)
9/10
Thorne
Best for: Athletes and premium methylcobalamin
Methylcobalamin · 1,000mcg methylcobalamin per capsule
Capsule · NSFNSF Certified for Sport
$0.20
#5Life Extension Methylcobalamin 5000mcg
8.4/10
Life Extension
Best for: High-dose B12 for confirmed deficiency
Methylcobalamin · 5,000mcg methylcobalamin per lozenge
Sublingual Lozenge · Third-Party Tested
$0.14
| # | Product | Best For | Ingredient & Dose | Form & Testing | Price | Rating | |
|---|---|---|---|---|---|---|---|
| 1 | Jarrow Formulas Methyl B-12 1000mcg Jarrow Formulas | Overall best methylcobalamin sublingual | Methylcobalamin 1,000mcg methylcobalamin per lozenge | Sublingual Lozenge Third-Party Tested | $0.07 | 9.3/10 | |
| 2 | Nature Made Vitamin B12 1000mcg Nature Made | USP-verified budget option | Cyanocobalamin 1,000mcg cyanocobalamin per softgel | Softgel USPUSP Verified | $0.05 | 8.6/10 | |
| 3 | Garden of Life mykind Organics B-12 Spray Garden of Life | Vegans and whole-food sourced B12 | Methylcobalamin (Whole-Food) 500mcg methylcobalamin per spray | Oral Spray Third-Party Tested, Non-GMO Project Verified | $0.18 | 8.8/10 | |
| 4 | Thorne Methylcobalamin (Methyl B12) Thorne | Athletes and premium methylcobalamin | Methylcobalamin 1,000mcg methylcobalamin per capsule | Capsule NSFNSF Certified for Sport | $0.20 | 9/10 | |
| 5 | Life Extension Methylcobalamin 5000mcg Life Extension | High-dose B12 for confirmed deficiency | Methylcobalamin 5,000mcg methylcobalamin per lozenge | Sublingual Lozenge Third-Party Tested | $0.14 | 8.4/10 |
Detailed Reviews
Top Pick
1
Jarrow Formulas Methyl B-12 1000mcg
Jarrow Formulas
9.3/10
$0.07/serving
Ingredient: Methylcobalamin
Dose: 1,000mcg methylcobalamin per lozenge
Form: Sublingual Lozenge
Testing: Third-Party Tested
1,000mcg methylcobalamin per lozengeClinical range: 500-2,000mcg daily
Clinical dose
Why we recommend it: Delivers the bioactive methylcobalamin form in a sublingual lozenge that dissolves under the tongue for direct absorption into the bloodstream. At $0.07/serving, it combines premium B12 form with excellent value. Over 30,000 Amazon reviews with a 4.7-star average. Pleasant lemon flavor.
Ideal for: Overall best methylcobalamin sublingual
Not ideal for: Those who want a simple swallowable pill without sweeteners
Pros
- Bioactive methylcobalamin form
- Sublingual delivery bypasses GI absorption
- Excellent value ($0.07/serving)
- Pleasant lemon flavor
Cons
- Contains mannitol sweetener
- Must dissolve under tongue (not swallowed)
- Methylcobalamin is less stable than cyanocobalamin
VeganGluten-freeNon-GMO
2
Nature Made Vitamin B12 1000mcg
Nature Made
8.6/10
$0.05/serving
Ingredient: Cyanocobalamin
Dose: 1,000mcg cyanocobalamin per softgel
Form: Softgel
Testing: USP Verified
1,000mcg cyanocobalamin per softgelClinical range: 500-2,000mcg daily
Clinical dose
Why we recommend it: USP Verified for purity, potency, and dissolution. The #1 pharmacist-recommended B12 supplement. At $0.05/serving, it is the most affordable option. Cyanocobalamin is well-studied and effective for most people who can convert it to active forms.
Ideal for: USP-verified budget option
Not ideal for: People with MTHFR variants or poor cyanocobalamin conversion
Pros
- USP Verified (gold standard)
- #1 pharmacist-recommended brand
- Most affordable at $0.05/serving
- Well-studied cyanocobalamin form
Cons
- Requires conversion from cyanocobalamin
- Not sublingual delivery
- Not ideal for MTHFR variants
- Contains soybean oil
Gluten-freeNo artificial colors
3
Garden of Life mykind Organics B-12 Spray
Garden of Life
8.8/10
$0.18/serving
Ingredient: Methylcobalamin (Whole-Food)
Dose: 500mcg methylcobalamin per spray
Form: Oral Spray
Testing: Third-Party Tested, Non-GMO Project Verified
500mcg methylcobalamin per sprayClinical range: 500-2,000mcg daily
Clinical dose
Why we recommend it: USDA Organic methylcobalamin in a convenient oral spray format — ideal for people who dislike swallowing pills. Sprays directly onto the oral mucosa for sublingual-like absorption. Whole-food based and certified vegan, organic, and Non-GMO. Raspberry flavor.
Ideal for: Vegans and whole-food sourced B12
Not ideal for: Those with confirmed deficiency needing therapeutic doses above 500mcg
Pros
- Convenient spray format
- USDA Organic certified
- Vegan methylcobalamin
- Direct oral mucosa absorption
Cons
- Lower dose (500mcg per spray)
- Premium price per mcg of B12
- Spray dosing is less precise
- Smaller bottle (140 sprays)
OrganicVeganGluten-freeNon-GMODairy-freeSoy-free
4
Thorne Methylcobalamin (Methyl B12)
Thorne
9/10
$0.20/serving
Ingredient: Methylcobalamin
Dose: 1,000mcg methylcobalamin per capsule
Form: Capsule
Testing: NSF Certified for Sport
1,000mcg methylcobalamin per capsuleClinical range: 500-2,000mcg daily
Clinical dose
Why we recommend it: NSF Certified for Sport — tested for 200+ banned substances. Thorne is trusted by Mayo Clinic and US Olympic teams. Clean formula with only methylcobalamin and hypromellose capsule. No fillers, sweeteners, or artificial flavors.
Ideal for: Athletes and premium methylcobalamin
Not ideal for: Those with absorption issues who benefit from sublingual delivery
Pros
- NSF Certified for Sport
- Clean formula — no fillers
- Trusted by Mayo Clinic
- Bioactive methylcobalamin
Cons
- Not sublingual delivery
- Premium price ($0.20/serving)
- Only 60 capsules per bottle
Gluten-freeNon-GMODairy-freeSoy-free
5
Life Extension Methylcobalamin 5000mcg
Life Extension
8.4/10
$0.14/serving
Ingredient: Methylcobalamin
Dose: 5,000mcg methylcobalamin per lozenge
Form: Sublingual Lozenge
Testing: Third-Party Tested
5,000mcg methylcobalamin per lozengeClinical range: 500-2,000mcg daily
Therapeutic dose
Why we recommend it: Delivers a high 5,000mcg dose of methylcobalamin via sublingual lozenge — ideal for people with confirmed B12 deficiency or malabsorption conditions. Life Extension is a research-focused brand with rigorous quality standards. Pleasant berry flavor.
Ideal for: High-dose B12 for confirmed deficiency
Not ideal for: Healthy adults without deficiency; dose is excessive for maintenance
Pros
- High-dose for confirmed deficiency
- Sublingual delivery
- Research-focused brand
- Pleasant berry flavor
Cons
- 5,000mcg is excessive for most people
- Contains sucrose sweetener
- Only appropriate for deficiency or malabsorption
- May cause acne at high doses in some individuals
Gluten-freeNon-GMO
How to Choose
Methylcobalamin vs Cyanocobalamin
Methylcobalamin is the bioactive form used directly in methionine synthase reactions. Cyanocobalamin must be converted and releases a tiny amount of cyanide (toxicologically insignificant). For most healthy people, both work. For people with MTHFR C677T variants (up to 40% of the population), methylcobalamin bypasses a potential conversion bottleneck.
Why Sublingual Delivery Matters
B12 absorption in the gut requires intrinsic factor, a protein produced by stomach cells. People with low intrinsic factor (common in adults over 50, those with pernicious anemia, or post-gastric surgery) absorb very little oral B12. Sublingual lozenges and sprays bypass this entirely by absorbing through the oral mucosa directly into the bloodstream.
Who Needs B12 Supplements
Vegans and vegetarians are at highest risk of B12 deficiency since B12 is found almost exclusively in animal products. Adults over 50 have reduced intrinsic factor production. People taking metformin or proton pump inhibitors (PPIs) have impaired B12 absorption. A blood test for serum B12 and methylmalonic acid is the most accurate way to assess status.
Dose Considerations
The RDA is only 2.4mcg, but oral absorption is 1-2%, so supplements use 500-5,000mcg to ensure adequate absorption. For maintenance: 500-1,000mcg daily. For deficiency correction: 2,000-5,000mcg daily for 1-3 months. B12 is water-soluble with no established upper limit — excess is excreted in urine.
How We Evaluate
Every product is scored against these weighted criteria. Our ratings reflect clinical evidence and product quality, not commission rates.
B12 Form
30%Methylcobalamin and adenosylcobalamin are bioactive coenzyme forms. Cyanocobalamin requires conversion and releases trace cyanide. Hydroxocobalamin is used clinically for injections.
Delivery Method
25%Sublingual lozenges and sprays bypass GI absorption issues and enter the bloodstream directly through oral mucosa. Critical for people with low intrinsic factor.
Dose Adequacy
20%The RDA is only 2.4mcg, but B12 absorption is extremely low (1-2%). Doses of 500-2,000mcg compensate for poor absorption and are standard in clinical practice.
Third-Party Testing
15%Independent verification of B12 content and form. Important because methylcobalamin is less stable than cyanocobalamin and may degrade.
Value
10%Cost per serving relative to B12 form and delivery method.
Frequently Asked Questions
What is the best form of vitamin B12?
What is the best form of vitamin B12?
Methylcobalamin is the best form for most people — it is the bioactive coenzyme form that your body uses directly without conversion. Sublingual lozenges provide the best delivery method, bypassing potential GI absorption issues. Jarrow Formulas Methyl B-12 ($0.07/serving) is our top pick.
How much B12 should I take daily?
How much B12 should I take daily?
For maintenance: 500-1,000mcg daily. For vegans/vegetarians: 1,000-2,000mcg daily. For confirmed deficiency: 2,000-5,000mcg daily for 1-3 months, then reduce to maintenance. The RDA is 2.4mcg, but supplements use higher doses because oral absorption is only 1-2%.
Can you take too much B12?
Can you take too much B12?
B12 has no established tolerable upper limit because excess is excreted in urine. However, very high doses (5,000mcg+) may cause acne or rosacea flare-ups in susceptible individuals. There is no evidence of toxicity even at high doses. That said, there is no benefit to megadosing if you are not deficient.
References
- Hunt A, Harrington D, Robinson S (2014). Vitamin B12 deficiency. BMJ. DOI PubMed
- Obeid R, Fedosov SN, Nexo E (2015). Cobalamin coenzyme forms are not likely to be superior to cyano- and hydroxyl-cobalamin in prevention or treatment of cobalamin deficiency. Molecular Nutrition & Food Research. DOI PubMed
- Pawlak R, Lester SE, Babatunde T (2014). The prevalence of cobalamin deficiency among vegetarians assessed by serum vitamin B12. European Journal of Clinical Nutrition. DOI PubMed