However, there is no robust evidence that B12 injections enhance energy, alertness, or performance in individuals whose B12 levels are already adequate
[DOI] [PubMed] [Google Scholar] 5.Koo J, Marangell LB, Nakamura M, et al
According to the National Institutes of Health (NIH) , zinc plays a role in: Immune cell development and signaling Antioxidant activity Wound healing and tissue integrity Cellular growth and repair Even marginal zinc deficiency may impair immune response and prolong recovery from illness
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