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Manufacturers assess the bioavailability and stability of the ingredients along with the clinical studies and research done
Gershtein and Dovedova 1999
If you are getting enough antioxidants in your diet, then you will be protecting your skin from damage
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GHK-Cu activates lysyl oxidase and prolyl hydroxylase enzymes, important for cross-linking collagen fibers and maintaining skin structure (Pickart, Biochemical Pharmacology, 2008)
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