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Comparison With Minoxidil A well-cited comparative study reported that the compound produced hair follicle enlargement effects comparable to minoxidil in animal models, while displaying a different side effect profile

They synthesize peptides for laboratory studies and clearly state the substance is not for human consumption

doi: 10.3906/biy-2005-102 2 AliN

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A number of clinical studies established that GHK-CU stimulates the synthesis of collagen, the production of selected glycosaminoglycans (like hyaluronic acid), and modulates matrix metalloproteinases (MMPs)

If you are prone to melasma, keep sun exposure low and ask a clinician before heat-based procedures