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How We Chose The Best Vitamin C Serums To narrow down this list of the best vitamin C serums, we tapped into our teams deep market knowledge and extensive testing experience, highlighting products and brands that make innovative, effective formulas

rare sensitivities are possible

Is the product FDA-approved, a dietary supplement, or a compounded drug

Who should avoid GHK-Cu entirely Wilson's disease or any copper metabolism disorder Active malignancy until more evidence exists Pregnancy and breastfeeding Known copper sensitivity Anyone unable to maintain sterile technique for injection When unsure, talk to us before starting anything

It can be used for oral, topical, or injectable applications, depending on the formulation and regulatory needs