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doi: 10.1007/s12282-020-01090-3

(2016) in the Journal of Cosmetic Dermatology tested GHK-Cu in nanocarrier formulations on facial volunteers

Their berberine is 500mg HCl per capsule, GMP-certified, hypoallergenic (no gluten, dairy, or common allergens), and the label is refreshingly straightforward

The lower dosage minimizes interference with the exogenous testosterone while providing enough hCG to keep the testes working
