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Notably, endogenous GHK-Cu levels in human plasma are age-dependent, dropping from ~200 ng/mL at age 20 to below 80 ng/mL after age 60
It works for women , men , and most skin types with minimal risk of irritation
Community protocols describing subcutaneous injection at 1-2 mg/day are self-reported and undocumented in peer-reviewed literature
Fatty Acid Synthesis : It helps make fatty acids, important for energy and healthy cells
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