I've used Cowboy Magic on mine. The other things I've used are animalintex, various horse wound creams, aloe vera gel and also wormer. The wormer was an accident, He spat some of it out and I had my mouth open and I actually swallowed some! Ugh!!!
When I trained for my BHSAI food wasn't very abundant at the training school so we all used to eat horse food, flaked maize being the favourite.