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Maybe all that free radical stress from exercise is a good thing, and increased consumption of some antioxidant nutrients might interfere with these necessary adaptive processes. So, if you decrease the free radical tissue damage, maybe you dont get that increase in activity of those antioxidant enzymes

Phytochemistry 66(2):187194

For example, studies suggest that GHK is present in the alpha 2(I) chain of type I collagen , which suggests that the tripeptide might be liberated by proteases at the site of a wound and exert in situ healing

Samples each containing approximately 500 g of protein in SDC lysis buffer (100 mM 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid [HEPES], 1% sodium deoxycholate [SDC], pH 8.1) were reduced and alkylated using 10 mM tris(2-carboxyethyl)phosphine (TCEP Sigma Aldrich) and 40 mM of chloroacetamide (CAA) at 95 C for 5 min