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
None of that means the medication is failing
Our results indicated that neither GHK nor GHK-Cu showed cytotoxic activity at the range of concentrations tested while CuCl 2 and Cu(OAc) 2 showed substantial cytotoxicity to the HaCaT cells at the highest concentration assayed, i.e., at 5800 M, after 30 mins treatment
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These include: Meat Fish Poultry Milk Eggs Fortified breakfast cereals Fortified breads Fortified nutritional yeasts Fortified plant milks If you follow a vegan diet (meaning you don't eat any animal products, including meat, milk, cheese, and eggs) or you're a vegetarian who doesn't eat enough eggs or dairy products, you could be lacking in vitamin B12