Thanks Just Thinking. Oh! The zinc and copper don't have to be within the same product. So I can go back to taking zinc picolinate (Swanson) and copper (Swanson)? I think the former fits the bill as picolinic acid is a "catabolite of amino acid tryptophan." The latter is in the form of copper chelate, but chelated to an amino acid? Doesn't look like it. The skin seems to have worsened since I stopped them. :(
I've also been taking Zn and Cu in the wrong ratio, 44:2. But picolinate is supposed to be most bioavailable. How critical is 15:2? Would something like 22:3 be alright or better not risk it?