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GHK-Cu (glycyl-L-histidyl-L-lysine bound to copper(II)) has been used for decades in low-concentration topical cosmetics with a generally favorable tolerability record, but there is almost no published human adverse-event data especially for injectable or systemic research use
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Cell Tissue Res., 377 (2):153-159
Anyone taking prescribed medication for conditions such as hypothyroidism, epilepsy, or kidney disease should also seek medical advice before starting supplementation
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