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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

(PubMed) Safety depends heavily on product purity, sterile technique, dosing, and supervision by licensed medical professionals

This signaling axis is central to BPC-157s ability to restore endothelial function following insult/damage to the human body

In short, Epitalon doesnt act on one aging lever