The skincare industry has embraced GHK-Cu with considerable commercial enthusiasm, incorporating it into serums, creams, masks, and microneedling treatments at concentrations ranging from 0.01% to 1%
Because they work on a cellular level, a "more is better" approach doesn't apply here
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Clinical and experimental evidence confirms a U-shaped relationship between copper levels and blood pressure, indicating that both copper deficiency and excess are associated with a higher prevalence of hypertension [213]
Journal of cardiovascular translational research
Category 1 These substances were under review and the FDA generally exercised enforcement discretion, meaning pharmacies were often allowed to compound them while evaluation was ongoing