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Cosmetic copper peptide formulations typically contain GHK-Cu at very low concentrations (0.05-0.2%) in topical bases optimized for skin penetration
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Some users take higher doses up to 2000 mcg daily without reported issues
Genetic factors, hormonal imbalances, and medical conditions may still require targeted treatments
With proper sterile technique, you can continue sampling from the same vial for 3+ months the standard "discard after 28 days" disclaimer is an FDA bacteriostatic labeling requirement, not a reflection of peptide efficacy
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