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10.1186/s12916-022-02582-z 84 MeczekalskiB.NiwczykO.KostrzakA.Maciejewska-JeskeM.BalaG.SzeligaA
Immune function: Important for immune cell function
serum levels average roughly 200 ng/mL at age 20 and decline to approximately 80 ng/mL by age 60
The only way to really know if you've taken too much vitamin B12 Apparently, there are, in fact, some things that can go wrong if you take too much vitamin B12, from a minor headache to a severe allergic reaction, depending on your own personal risk profile
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