Sand Free for Horses by NaturVet

99.6% Pure Husk. Husk (not seed) is the most effective part of the psyllium to help remove sand from the horse. The apple flavoring insures that your horse will eat our tasty supplement. Psyllium is a terrific source of fiber and the number one prevention of sand colic. Sand Free is the most palatable psyllium on the market and will not cause weight gain when fed properly.