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Vitamin B12 for Vegetarians & Vegans: Deficiency Signs & Sources
Clear, shame-free guidance on meeting B12 needs without meat: fortified nutritional yeast, plant milks, and sublingual supplement protocols.
By Nourish By Nutrients Editorial Team •
Updated: October 2026
Key Evidence Takeaways:
- B12 (cobalamin) is produced solely by bacteria and does not exist naturally in unfortified plant foods.
- Unfortified spirulina, nori, and seaweed contain inactive pseudo-B12 analogues that do not support human nerve function.
- Reliable options include B12-fortified nutritional yeast/plant milks or a weekly 1,000-2,000 mcg sublingual B12 supplement.