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Body weight is the most obvious: weight-based protocols scale the dose to body mass, so a heavier individual using a per-kilogram protocol would use proportionally more
How This Compares to Other Research This foundational 2007 study has been built upon by a growing body of copper peptide research: Pickart & Margolina (2018) In their comprehensive review of GHK-Cu regeneration science, the authors confirmed that copper peptide hair-stimulating effects appeared comparable to 2% minoxidil, with a superior safety profile
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Xavier da Silva TN, Schulte C, Alves AN, Maric HM, Friedmann Angeli JP
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The NHS advises that taking up to 2mg (2000 micrograms) daily of vitamin B12 supplements is unlikely to cause harm, with no established upper limit in the UK
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