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Vitamins, including A and C, and minerals like zinc and magnesium are often marketed for helping immunity, and according to Hancock, "in most of those cases there is a very, very good body of evidence that suggests that they're beneficial." Hancock says he takes a multivitamin every day

GHK-Cu is a small, naturally occurring copper peptide (a tripeptide, meaning three amino acids: glycine, histidine, lysine) bound to a single copper ion

Comparative studies have found GHK-Cu to be as effective as retinol and vitamin c in improving visible signs of aging, but with significantly lower rates of skin irritation

While rare, some individuals may experience minor digestive changes such as mild diarrhea after a B12 shot