Chondroitin: Next to glucosamine, Chondroitin Sulfate is one of the most popular and effective joint support nutrients on the market. Clinical studies demonstrating Chondroitin’s efficacy have utilized bovine-source Chondroitin. However, Chondroitin from pig and chicken sources is more affordable and more readily available. At NOW® we use only bovine-source Chondroitin, and our technical staff developed an analytical method that accurately identifies the source of our Chondroitin. Many brands don’t even identify their source.