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Copper itself is a comparatively weak skin sensitizer a 2014 review (PMID 25098945) reported positive copper patch-test reactions in roughly 3.8% of tested subjects so contact allergy is possible but uncommon
Glutathione is a naturally occurring antioxidant that is already present in the human body and plays a key role in protecting cells from damage caused by free radicals
Research supports: Reduced joint inflammation in arthritis models with daily use, showing long-term benefits up to one year
Source: ScienceDirect abstract / PDF Review summarizing skin remodeling & regenerative effects of GHK/GHK-Cu
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