Supplements wise, the only thing I give them is what they really need. I give one of my TBs For-A-Flex Biotein Formula for he has very soft crumbly feet and it helps with his feet as well as gives him a nice coat. My other TB, I give Pure Gluasime (sp?) Powder, for he has soundness issues and this helps in his recovery. They are just fed Oat Hay and beet pulp and I only do the beet pulp for added weight and hydration. I don't really believe in giving a horse everything out there on the market, most of it is just fillers anyways.