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When taken internally, GHK-Cu may have more severe side effects, from skin irritation to headaches and nausea

By boosting this enzyme, the peptide provides ongoing protection against oxidative damage

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Nevertheless, the female participants included in this study were in the same performance category with similar finishing times and did not noticeably influence the overall results, making it reasonable to present the mixed-sex data

Aging (Albany NY) 7(9):616

This recycling mechanism extends glutathione's functional life at the cellular level, so you get more antioxidant activity from the same daily dose