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Most patients report SubQ as virtually painless when technique is correct, whereas IM commonly produces discomfort lasting 1224 hours

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They concluded that while GHK-Cu does demonstrate anti-wrinkle effects in cellular studies, "there is a surprising absence of clinical studies using them." The review identified skin permeation as the central challenge: GHK's high aqueous solubility and low partition coefficient work against transdermal absorption

For administration and dosing guidance, consult your healthcare provider