Our Pharmaceutical Grade Glucosamine sulfate is the finest and purest glucosamine supplement you can give your dog or cat. It is also the most researched joint nutrient available and the most easily and completely utilized. In fact it is the only joint nutrient with a 98% absorbability rate in the body! It is a natural nutrient produced by the body and is often recommended as a joint supplement to prevent future joint damage or assist in new cartilage growth. It is very safe and recommended for puppies and kittens through seniors.