Vitamin B12 — answers to vitamin B12, cobalamin
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A water-soluble B vitamin required for nerve function, DNA synthesis, and red blood cell formation. Supplement forms include cyanocobalamin and methylcobalamin; this label does not specify which.
Why it’s used
Taken to maintain normal B12 status, particularly by people with reduced absorption (older adults, those on certain diets, or with digestive conditions affecting absorption) or low dietary intake.
What the evidence is for
correcting B12 deficiency and its symptoms.
What the evidence says
NIH ODS states that vitamin B12 is well established as essential, and that supplementation reliably corrects deficiency and reverses associated symptoms such as fatigue and nerve problems. Evidence for benefit in people who are not deficient is much thinner.
Dose studied
2.4–2.4 mcg — adult RDA, per NIH ODS.
Context
The adult RDA is 2.4 micrograms per day, higher during pregnancy and lactation, per NIH ODS. No tolerable upper intake level has been set because B12 has low toxicity from oral intake.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.