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Abstracts, June 2021:856-7

Safety Considerations and Who Should Consult a Provider GHK copper is generally well-tolerated at physiologic doses, but individuals with copper metabolism disorders, Wilson disease, or elevated serum copper should avoid supplementation without medical clearance

Antioxidant capacity in the lung is substantially reduced and oxidative stress can persist long after the cessation of cigarette smoking or an acute exacerbation of COPD owing to continued production of ROS from endogenous sources [9, 12]

Reputable brands will often make these Certificates of Analysis (COAs) available upon request or host them directly on their website