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Because the GHK-Cu complex is sensitive to oxidation, light and pH extremes, the container and the supporting chemistry can matter as much as the headline percentage

Scaglia F, Sutton VR, Bodamer OA, Vogel H, Shapira SK, Naviaux RK, Vladutiu GD

Stability and Handling# Dihexa is relatively stable due to its non-natural modifications (N-hexanoic acid cap, aminohexanoic amide C-terminus), which protect it from typical peptidase degradation

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10.1016/j.bcp.2009.08.025 Biochem Pharmacol