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Deficiency can also be caused by poor absorption
18 Unlike some other copper containing compounds like copper chloride or copper acetate, GHK-Cu has not been found to be cytotoxic or to cause irritation topically, making it an ideal option for delivery of copper into the skin
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Leclerc D, Wilson A, Dumas R, Gafuik C, Song D, Watkins D, Heng HHK, Rommen JM, Scherer SW, Rosenblatt DS, and Gravel RA (1998)
NAC can help, but your body has to convert it, and conversion rates vary wildly from person to person
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