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Is GHK Cu actually worth it? is genuinely one of the most common questions in my comments, so let me finally answer it properly., The short version: copper peptides have real research behind them, GHK Cu Scalp Serum for Hair Copper Peptide GHK Cu for hair growth does it actually work? Short answer: no. GHK Cu can be great for skin but when it comes to hair growth, the evidence just isn't there. And this GHK Cu Peptide, GHK Cu & AHK Cu Lightweight Texture, Non Greasy, 1 oz : Beauty & Personal Care

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