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I.MarceauG.BernardM.BourbonnireL.et al (2011)
Unlike harsh chemical ingredients that can cause irritation or damage, GHK-Cu is gentle enough for all hair types, including sensitive scalps, and has been proven safe and effective in numerous clinical studies
Bigger studies need to be done
Well, compared to retinoids or acids, most peptides dont cause too much irritation, peeling, or sun sensitivity
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