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The 1% concentration in this GHK-Cu serum matches the doses used in published human clinical trials, providing researchers with a well-characterized reference concentration Koji White - Kojic Acid & Glutathione Skin Brightening Soap | YesStyle Bottle Size:250 mL https://cdn.shopify.com/s/files/1/2461/7623/files/what-are-the-potential-side-effects-and-risks-of-bpc-157.png?v=1784826345 P80W
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