Vitamins
Vitamin B12
A vitamin needed to build red blood cells and to maintain nerves.
Unit pg/mLTypical adult range 211–911 pg/mL
What it is
A vitamin needed to build red blood cells and to maintain nerves.
Why it matters
Deficiency causes an anemia with enlarged red cells, and nerve symptoms that may not fully reverse if it is left long enough.
Reading the number
The blood level can look normal while tissue levels are low. Supplements taken shortly before the draw raise it without telling you anything about your stores.
What moves it
supplementsmetforminstomach acid blockersvegetarian or vegan diet
Read alongside
When to raise it
Worth discussing a low-normal value if you have tingling, numbness or unexplained fatigue.
Also known as
On a report in another language.
A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under Vitamin B12.
Vitamina B12B12-vitamiinCobalaminaCyanocobalaminCobalamine
Catalog entry last updated 2026-08-27. Browse all 165 metrics.