Lexi has been diagnosed as being zinc deficient. Her dermatologist assumed she was when she had her first visit but wanted to clear up her yeast and fungal infections first. We are now to buy zinc to supplement her diet. I was told that it too much zinc can be harmful. I am worried about supplementing for this reason. Do any of you use zinc as a supplement and what exactly is it for? She has recurrent fungal infections in her nail beds and her nails break very easily and are brittle. I guess this clued them in to check for this???