My son has mouth sores from chemo and radiation. The dr. suggested a supplement from GNC (General Nutrition Center) called glutamine. It is a powder that you mix in a liquid and drink. They also have capsules, but got the powder instead. It is an amino acid supplement, which a friend who is a body builder said you need to heal the sores. We use 1/2 tsp. in 4 oz of water, 3 times a day. It seems to be helping. I happened to be in Walmart, and they carried it there as well. Good luck to you and God bless