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GHK-Cu should be avoided during pregnancy or breastfeeding, in active cancer or untreated solid tumors, in Wilson's disease or other copper-handling disorders, and in known copper allergy

Investigations comparing topical GHK-Cu with common dermatologic comparators reported indications of higher dermal procollagen, along with observations consistent with thicker and more elastic skin architecture over multi-week intervals

Strong positive reactions for PCNA in lymphoid follicles and follicle-associated epithelium were seen in the OTA group

Understanding the different types can help you choose the right skincare products for your needs

I'd tried vitamin C, retinol, you name it