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Copper may become potential irritants when they are oxidized and causes the formation of free acids

10.1016/j.addr.2021.114083 119 YueX.GuoH.WangG.LiJ.ZhaiZ.WangZ.et al (2025)

That reasoning is legitimate as a hypothesis, but it is worth flagging early that the body makes less of it with age is not by itself evidence that adding it back least of all by injection produces a cosmetic benefit

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But they are not a replacement for proven hair loss treatments such as minoxidil, finasteride, dutasteride, PRP in the right patient, or a well-planned hair transplant