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The two dominant community concentrations are 2.5 mg/mL (for peptides with wide dose ranges) and 5 mg/mL (for peptides dosed in the 250-500 mcg range)
Elkon K, Casali P
Endogenous GHK is found in human plasma, where its concentration declines significantly with age a pattern that has driven sustained interest in GHK-Cu as a research compound
Then try the escalation again
Cell suspensions were serially diluted and plated on TSA with 0.4% activated charcoal (Sigma) to neutralize residual antibiotics, allowing enumeration of surviving bacteria
Studied effects in research literature include modulation of extracellular matrix components (collagen, elastin, glycosaminoglycan synthesis markers), antioxidant pathway markers, and cellular response to oxidative stress in fibroblast and keratinocyte research models (Pickart, Biomed Res Int, 2015
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