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PubMed, Zhao, Bao, et al
Natural GHK-Cu levels in your body peak around age 20 (approximately 200 ng/ml in plasma) and decline to roughly 80 ng/ml by age 60
Without biomarker context, supplementation may represent unnecessary expense and potential metabolic interference rather than targeted intervention
Glutathione injections are more effective than oral supplements for delivering this vital antioxidant
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