Effective Natural Products Canine Glucosamine Concentrate Gallon Glucosamine Concentrate for Joint Health Our concentrated formula for large breed dogs and multiple pet households. Glucosamine, MSM and Chondroitin blend to support healthy joints, bone, ligaments and tendons. Boron supports calcium absorption for overall bone health. EASILY DIGESTIBLE LIQUID FORM THAT DOGS ENJOY! LIQUID = BETTER ABSORPTION Available in 32 oz. (quart), and gallon sizes. A gallon nearly equals buy three quarts get one free. Refrigeration not required. If product freezes and thaws it may create crystallization. Even if this occurs, the product is still safe for consumption. Product can withstand some heat so delivery in hot summer months should not be a concern. Made in the USA in a GMP certified safe facility. 