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View GHK-Cu (Copper Peptide) Bioavailability Oral bioavailability of GHK-Cu is significantly lower than injection
Peptides containing cysteine, methionine, asparagine, glutamine, or tryptophan may be especially sensitive
Cons: limited clinical trial data specifically on S-acetyl form in humans, lower dose per tablet, fewer published studies than Setria reduced glutathione or liposomal delivery
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