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Injection protocols circulating online are vendor convention, not research findings The 2007 study found effects at picomolar to nanomolar concentrations (10⁻¹² to 10⁻⁹ M) — millions of times lower than the percentages sold in topical products AHK-Cu is a cosmetic ingredient, not an FDA-approved drug , and it is not on the WADA prohibited list Its better-studied relative GHK-Cu carries substantially more published evidence, and much of what circulates as "AHK-Cu research" is actually GHK-Cu research What AHK-Cu Actually Is AHK-Cu is a three–amino-acid peptide — alanine, histidine, lysine — bound to a copper(II) ion

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That’s what the Harvard study found, too