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copper peptide ghk cu hair growth clinical study humans ghk-cu human randomized trial Peptides: 50 Years of Research, Explained ghk-cu hair growth – GHK-Cu Copper Peptides: 50 Years – All products (1) dihexa peptide protocol oral Size:4-pack

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PMID: 15525569 Johansen PB, et al

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The groups most likely to develop B12-related hair and skin changes are the same ones at risk for deficiency generally: vegans and vegetarians, adults over 50, people on long-term metformin or proton pump inhibitors, anyone who's had bariatric surgery, and people on GLP-1 protocols whose reduced appetite has significantly lowered their overall nutrient intake for an extended period