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Human studies require extensive ethical approval before proceeding

Do they actually work

If a product doesn't disclose its concentration on the label, treat the claim as marketing, not evidence

I dont think of this as a performance-enhancing drug in the same way as EPO or an anabolic steroid, McGuire says

Studies using the Broad Institute Connectivity Map show that GHK peptide modulates expression of multiple genes, resetting pathological gene expression patterns back to health

Blood work tracking your liver enzymes and imaging studies monitoring liver fat content give us objective data about what's actually working