Jean - thank you so very very much for responding to my email with your personal email,. I am sending your husband good wishes and positive thoughts, I was told by my ocologist nurse to take 220 mg of zinc sulfate 3 x a day! That that was the requirement - it seems like a lot but I did some surfing on the web and found that that is the dosage. Maybe your husband wants to up his? Cancer is a terrible thing for the whole family. I use to cook supper every night for my husband who drives from our farm in northwestern NJ into Manhattan to his office every day! Now I have no desire, esp, no taste, to cook any meal. But he is my rock and we will get through this nightmare of sorts.