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Frequently asked questions about vitamin B12 Vitamin B12 contributes to normal energy metabolism, supports normal nervous system function, supports normal psychological function, and helps reduce tiredness and fatigue

For boosting testosterone B vitamins are sometimes included in testosterone-boosting supplements and are thought to increase testosterone levels in men, which naturally decrease with age

Some research suggests that high-dose oral B12 supplements work just as well as B12 shots for raising B12 levels in people with a deficiency

Fewer healthy red cells means less oxygen delivered to muscles and organs, which compounds fatigue further