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Frysinger, R
IM wastes peptide, increases injection trauma, and requires daily dosing to achieve what SubQ delivers every 34 days
Copper in excess is genuinely toxic, and in a zebrafish model free copper caused heart toxicity (Hsiao et al., 2020) though in that same study the GHK peptide chelated copper and reduced the harm, so GHK-Cu is not equivalent to free copper
Vitamin C is often suggested as a companion because it may help maintain glutathione in its active, reduced form
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