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Mild soreness at the injection site can happen and usually resolves fast
Concentrations used: In cosmetics, GHK-Cu concentrations generally range from 0.1% to 3%
Topical delivery applies the compound directly to the area being treated, so patients can focus on skin firmness, texture, scalp support, or hair wellness without turning to risky online sources
That mechanism is plausible, but a copper complex acting in cell models does not automatically prove the same outcome in human patients
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