50 mg of zinc is alot. It may interfere with copper and other minerals absorption.i have lots of bad experiances with zinc in higher doses like 50mg. Try taking it out for a few days and see if you don't feel better overall because of it. also, having too many minerals in the blood like zinc, copper, and iron which is unbound to any carrier proteins to guide them in the right places can contribute to free radical generation leading to premature aging.
i wouldnt exceed the RDA of zinc or even perhap slightly below that like 50% in a supp. i do realize there is some studies that may have shown benefits for acne in higher doses, but, even if it may slightly improve your acne, the other effects must be weighed in.
Do you think I should just take my 15 mg of zinc then?