01
Why people use it
An essential nutrient that occurs reliably only in animal-derived foods, making fortified foods or supplementation a genuine requirement -- not an optional add-on -- for anyone eating a fully plant-based diet.
- ✓Preventing and correcting vegan/vegetarian B12 deficiency
- ✓General B12 status maintenance on a plant-based diet
02
What the evidence says
B12 deficiency risk on a vegan diet is well-established and specifically documented by the NIH; this is a genuine nutritional gap requiring a reliable fortified source or supplement, not an area of scientific dispute.
Hover, focus or tap each label for context.
These labels summarize the available context; they are not a clinical recommendation.03
Common forms
Hover, focus or tap a form to see what it means.
Safety note
Know before you use it
The body stores much more B12 than is typically consumed in a day, so deficiency symptoms -- fatigue, weakness, neurological changes -- can take years to appear even without adequate intake, making it easy to underestimate the need for a reliable source. Infants of vegan mothers who are not adequately supplemented are at particular risk. Anyone with digestive conditions affecting nutrient absorption, or taking medications known to reduce B12 absorption (including some acid-reducing drugs and metformin), should discuss B12 status specifically with a clinician.
Sources & review
- Vitamin B12 - Health Professional Fact SheetNIH Office of Dietary Supplements
- Vitamin B12 - ConsumerNIH Office of Dietary Supplements
- A systematic review and meta-analysis of functional vitamin B12 status among adult vegansPubMed