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GHK-Cu is compatible with most ingredients, including niacinamide and hyaluronic acid, but should not be combined with alpha hydroxy acids (AHAs) or strong acids in the same formula, as these may reduce efficacy ZForm_Tablets Fulfillment Location:UK GHK-Cu + AHK-Cu Copper Peptide Shampoo, 4000mg https://www.tiktok.com/api/img/?itemId=7544151756238900536&location=0&aid=1988

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