NaturVet Glucosamine Double Strength liquid is a good maintenance or preventative joint formula. This veterinarian recommended formula provides adequate levels of Glucosamine and Chondroitin to help support and maintain healthy cartilage. Ester-C and Vitamin E help protect against free radicals that cause cellular damage. Maintains joint flexibility and alleviates aches and pains associated with exercise. Tasty natural flavoring that dogs love. Each teaspoon contains 500mg Glucosamine HCI, 23mg Yucca Schidigera Extract, 60mg Chondroitin sulfate, 90mg Ascorbic Acid (Vitamin C) and 3.3 IU d-Alpha Tocopheryl (Vitamin E).