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Working with fibroblast cultures, they demonstrated that GHK-Cu stimulated collagen synthesis at concentrations beginning between 10 picomolar and 100 picomolar, with peak stimulation at 1 nanomolar

Brady, K., Dickinson, S

Circulation 133(8):698705 Ritterhoff J, Tian R (2017) Metabolism in cardiomyopathy: every substrate matters

Why it's not available in the US: Despite global approval, thymosin alpha-1 was never FDA-approved in the United States

Title 21, Code of Federal Regulations (CFR), section 809.3(a). This product may not be used or formulated in any agricultural, pesticidal, veterinary or animal products, food additives or household chemicals or any other unspecified use