does ghk cu cause diarrhea can A Dermatologist's Take on the Copper Peptide (GHK- Cu) Trend GHK-Cu: The Powerhouse Copper Complex
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For most people the single best copper peptide serum is a stable 12% GHK-Cu formula with a low, non-irritating pH and minimal competing actives concentration alone is not a reliable measure of quality

Inoue M, Taketani N, Sato T, Nakajima H

Di Tommaso N, Gasbarrini A, Ponziani FR
