B12 for Vegans & Vegetarians (2026): What to Know
If you eat plant-based, B12 is the nutrient dietetic bodies most often say to supplement. B12 comes from bacteria, not plants, so it's essentially absent from a vegan diet outside fortified foods. Every dietetic body agrees: vegans must supplement (Fernandes 2024, PMID: 38794680).
Amount: ask your clinician or a registered dietitian what amount is right for you. Form: cyanocobalamin or methylcobalamin — both vegan.
A low-cost general option: Nature Made B12 1000mcg. Don't rely on spirulina or fermented foods — they're not reliable B12.
Why B12 is different
Most "vegans need to supplement X" claims are overblown — you can get protein, iron, and most nutrients from plants with a bit of planning. B12 is the genuine exception. It's synthesized by bacteria and reaches the food chain through animal products; plant foods contain virtually none. There's no clever plant-based workaround, which is why dietetic associations are unanimous that vegans (and largely vegetarians) need a B12 supplement or reliably fortified foods (Fernandes 2024, PMID: 38794680).
The stakes make it worth taking seriously. B12 deficiency develops slowly (the body stores a few years' worth), so a new vegan may feel fine for a long time — then low B12 can lead to anemia and nerve problems. Supplementing is cheap; the downside of skipping it is not.
How much to take
Because B12 absorption is inefficient at high oral doses (only ~1% via passive diffusion), tablets are often sold far above the 2.4 mcg RDA. The NIH has not set an upper limit for B12. The right amount and schedule for you is a question for your clinician or a registered dietitian.
Which form for vegans?
Both common forms are vegan — they're made by bacterial fermentation, not from animals. Cyanocobalamin is often the recommended pick for vegans: it's the most stable, cheapest, and most-studied form, and it reliably raises B12 levels. Methylcobalamin (the active form) is equally fine if you prefer it. Don't overthink it — see our form comparison. The one thing to avoid is relying on non-supplement "natural" sources: spirulina, nori, and fermented foods provide B12 analogues or inconsistent traces that are not a dependable source.
Best B12 for vegans, ranked
| Product | Form | Dose | Servings | Price | Cost/Day | Certification (as listed) | Buy |
|---|---|---|---|---|---|---|---|
| Carlyle Vitamin B12 100 mcg (200 Tablets) | Cobalamin | 100mcg | 200 | $6.99 | $0.03 | None | Buy |
| Nature Made Vitamin B12 1000 mcg Sublingual Fast Dissolve Best Value | Cyanocobalamin | 1000mcg | 150 | $16.85 | $0.11 | USP Verified | Buy |
| Jarrow Formulas Methyl B-12 1000 mcg Lemon Budget Pick | Methylcobalamin | 1000mcg | 100 | $11.92 | $0.12 | None | Buy |
| NOW Foods Methyl B-12 5000 mcg Lozenges | Methylcobalamin | 5000mcg | 60 | $15.02 | $0.26 | None | Buy |
| Solgar Methylcobalamin (Vitamin B12) 5000 mcg Sublingual Nuggets | Methylcobalamin | 5000mcg | 60 | $19.69 | $0.33 | None | Buy |
| Thorne Vitamin B12 as Methylcobalamin 1 mg Quality Pick | Methylcobalamin | 1000mcg | 60 | $24.00 | $0.40 | NSF Certified for Sport | Buy |
Frequently asked questions
Do vegans really need B12?
Dietetic bodies advise it. B12 is made by bacteria, not plants, so it's essentially absent from a vegan diet outside fortified foods. Low B12 over time can lead to anemia and nerve problems.
How much should a vegan take?
Ask your clinician or a registered dietitian what amount is right for you. The RDA for adults is 2.4 mcg a day, and B12 tablets are often sold at much higher amounts.
Best form for vegans?
Both cyanocobalamin and methylcobalamin are vegan. Cyanocobalamin is often recommended (stable, cheap, well-studied). The dose and consistency matter more than the form.
Can I get B12 from plant/fermented foods?
Not reliably — spirulina, nori, and fermented foods give analogues or inconsistent traces. Only fortified foods and supplements are dependable.
Related guides
- B12 deficiency signs — the symptoms, the two tests, and the causes
- Best B12 Supplement
- B12 for Energy & Fatigue
- Methylcobalamin vs Cyanocobalamin
- All B12 Products
Sources
- Fernandes S, et al. "Exploring Vitamin B12 Supplementation in the Vegan Population: A Scoping Review of the Evidence." Nutrients. 2024;16(10):1442. PMID: 38794680
- Langan RC, Goodbred AJ. "Vitamin B12 Deficiency: Recognition and Management." Am Fam Physician. 2017;96(6):384-389. PMID: 28925645
- NIH Office of Dietary Supplements. "Vitamin B12: Fact Sheet for Health Professionals." ods.od.nih.gov