Vegans can get vitamin B12 reliably from fortified foods and supplements, since plant foods don’t naturally contain it.
Plenty of people switch to a plant-based diet believing seaweed, spirulina, or raw veggies will cover their B12 needs. They won’t. The honest answer to how vegans can get vitamin B12 comes down to two dependable routes: fortified foods and supplements.
Why Vegans Need To Think About B12 At All
Vitamin B12 is the only vitamin you can’t get from plants in their natural state. The National Institutes of Health states plainly that plant foods have no vitamin B12 unless they’re fortified, and only animal foods contain it naturally. That puts anyone eating a fully plant-based diet in a specific risk group.
The NIH identifies people who eat little or no animal food, including vegans, as at risk for B12 deficiency. The Academy of Nutrition and Dietetics is just as direct: vegans must regularly consume reliable B12 sources or they can become deficient. Babies of strict vegan or vegetarian mothers may also not get enough B12, which is why prenatal planning matters.
This isn’t scaremongering. A deficiency develops slowly, but the consequences — fatigue, nerve damage, cognitive issues — are serious enough that every major health body flags the risk.
Fortified Foods: The Everyday Option
Fortified foods are the easiest way for vegans to get vitamin B12 without changing their routine much. The NIH specifically names fortified breakfast cereals and nutritional yeast products as appropriate sources for vegetarians and especially vegans.
The catch is consistency. These foods only help if you eat them regularly. The NIH notes that fortified foods and supplements substantially reduce deficiency risk, but they still need to be consumed consistently.
What to look for on labels:
- Nutritional yeast labeled as containing B12 (not all brands fortify it)
- Fortified plant milks — check the carton, since coverage varies by brand
- Breakfast cereals with B12 added, usually listed in the vitamin panel
- Some meat substitutes and plant-based yogurts are fortified too
If you’re relying on fortified foods alone, you need them in your daily diet, not occasionally.
What Doesn’t Work: The Myths To Skip
A surprising number of vegan sources floating around online simply don’t hold up. The Academy of Nutrition and Dietetics is explicit: tempeh, nori, spirulina, chlorella algae, and unfortified nutritional yeast cannot be relied upon as adequate or practical B12 sources.
The Academy also warns specifically against depending on seaweed or fermented foods for B12. These foods may contain B12-like compounds, but they’re often analogues — forms that can block the real vitamin from being absorbed.
Supplements: The Reliable Bet
For most vegans, a daily B12 supplement is the most dependable route. The NIH confirms that dietary supplements are an appropriate source for vegetarians and especially vegans.
Two forms matter: cyanocobalamin and methylcobalamin. Cyanocobalamin is the most studied and stable form; methylcobalamin is the active form your body uses directly. Both work for vegans, and your choice between them is a matter of preference rather than effectiveness.
The NIH emphasizes that fortified foods and supplements reduce deficiency risk only when consumed consistently.
If you’re ready to pick one, our tested roundup of the best vegan B12 supplements breaks down the top options by form and price.
FAQs
How much B12 do vegans actually need daily?
General guidance for adults is around 2.4 micrograms per day, a figure most health organizations cite. Meat-eaters often absorb this easily from meals, but vegans relying on fortified foods need to check labels carefully to hit that number.
Can you get B12 from mushrooms or fermented foods instead?
No. Mushrooms may contain B12 analogues, but these aren’t reliably usable by the body. Fermented foods like tempeh and miso fall into the same category. The Academy of Nutrition and Dietetics explicitly warns against depending on seaweed or fermented foods for B12, so neither should replace fortified foods or supplements.
Should vegans get their B12 levels tested?
References & Sources
- National Institutes of Health. “Vitamin B12 – Health Professional Fact Sheet.” Explains plant foods lack natural B12 and identifies vegans as an at-risk group.
- National Institutes of Health. “Vitamin B12 – Consumer Fact Sheet.” Lists fortified foods and supplements as appropriate vegan sources.
- National Library of Medicine. Research article on vitamin B12 in plant-based diets. Supports the Academy’s position that plant foods and fermented items aren’t adequate B12 sources.