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Amino acid metabolism also contributes to this regulation

Small peptides enter the bloodstream within minutes of a subcutaneous injection, and compounds like BPC-157 and GHK-Cu act through gene-signaling cascades that work body-wide rather than only where the needle went

This interpretation is consistent with clinical observations that oral glutathione supplementation has limited bioavailability, favoring approaches that maintain precursor sufficiency instead of direct replacement [117,118,119]

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