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Description
It is not recommended to take vitamin B12 if you are not diagnosed with vitamin B12 deficiency

Mood enhancement Vitamin B12 plays a role in producing serotonin, a hormone that regulates mood
How do I know if I have a vitamin B12 deficiency
Where Phase I or Phase II human trials exist, they are noted in the compound page summary

A lack of vitamin B12 could lead to DNA mutations or impaired cell division
(PubMed) Herbert V