Chondroitin: Everything You Need to Know Chondroitin is a chemical found primarily in joint cartilage. A form of chondroitin, known as chondroitin sulfate, is manufactured from animal byproducts and sold as a dietary supplement to aid in the treatment of osteoarthritis. Chondroitin sulfate is often co-formulated with glucosamine sulfate, a naturally occurring compound found in joint fluid, under the presumption that they can slow or even reverse the loss of joint cartilage. http://www.haiyubiotechnology.com/dietary-supplement/chondroition-sulfate-for-joint-support.html