Virbac Vetasyl Fiber Supplement Capsules contain 100% natural fiber source, which includes Psyllium and Barley. Encourages natural elimination without the aid of chemicals, while providing a gentle, effective relief from constipation. Convenient, easy-to-administer. Cats spend a significant part of their lives cleaning and grooming. Often swallowing their hairballs and creating a blockage - hairballs. This can interfere with digestion and elimination. VETASYL works wonders! Just sprinkle on your cats food. Directions for Use: For pets 8 to 20lbs, sprinkle one capsule per day over food. For pets under8lbs, use 1/2 capsule per day. SIZE 100 caps SIZE2 Fiber Capsules for hair balls COLOR 500 mg per capsule INFO effective relief from constipationINFO2for use on cats and dogs.