Vitamin
Vitamin B12
The NIH Office of Dietary Supplements publishes a recommended amount of Adults 2.4 mcg. Read 2026-08-16.
What is Vitamin B12?
NIH's fact sheet for Vitamin B12 carries no line we quote here under this heading.
How much Vitamin B12 does NIH publish?
| Life stage | Amount | Printed table |
|---|---|---|
| Adults | 2.4 mcg | Recommended Amount |
| Birth to 6 months | 0.4 mcg | Recommended Amount |
| Breastfeeding teens and women | 2.8 mcg | Recommended Amount |
| Children 1–3 years | 0.9 mcg | Recommended Amount |
| Children 4–8 years | 1.2 mcg | Recommended Amount |
| Children 9–13 years | 1.8 mcg | Recommended Amount |
| Infants 7–12 months | 0.5 mcg | Recommended Amount |
| Pregnant teens and women | 2.6 mcg | Recommended Amount |
| Teens 14–18 years | 2.4 mcg | Recommended Amount |
Children and teens
Rows for children and teens appear in the table above, in NIH's own wording.
Pregnancy and breastfeeding
Rows for pregnant and breastfeeding life stages appear in the table above, in NIH's own wording.
What upper limit does NIH publish for Vitamin B12?
NIH publishes no upper limit for Vitamin B12.
Which foods contain Vitamin B12?
NIH's fact sheet for Vitamin B12 carries no line we quote here about foods.
Where these numbers come from
Every quote and every amount on this page comes from National Institutes of Health, Office of Dietary Supplements. Vitamin B12 — Consumer. Public domain (U.S. Government work). LAFYA read the sheet 2026-08-16.
Read the full fact sheet at NIH Office of Dietary SupplementsWhat LAFYA does not say about Vitamin B12
LAFYA publishes no claim that vitamin b12 does anything in the body, because we cannot prove one.