Copper in its metallic state has no effect on the skin and it becomes a potential irritant or allergen when it is corroded to become soluble through the action of exudates encountered on the skin surface, or in a relatively corrosive physiological environment such as the oral cavity or the uterus 3
Additional studies suggest CoQ10 may support sperm parameters, though outcomes vary by population and baseline fertility status
284, E390E398
However, for topical results, applying diluted ACV externally gives more direct skin benefits
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Zhao L, Zhang C, Cao G, et al