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Longevity pathways activated NAD+-dependent enzymes like SIRT1, tied to DNA repair and stress response, become more active
Deficiency may lead to brittle nails, hair loss, or dry, damaged skin
Also, patients should be warned about the danger of taking folic acid in place of vitamin B12, because the former may prevent anemia but allow progression of subacute combined degeneration
Additionally, athletes, individuals on restrictive diets, and those seeking an energy boost may also find B-12 injections helpful
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