ARTHOGEN FOR HORSES, 1400 GRAM (Petlabs360) Arthogen for Horses is a specially formulated supplement designed to promote healthy joints. Contains 2000mg of Glucosamine HCI 99+%, Sodium Chondroitin Sulfate, Ascorbate and Maganese in an apple-flavored base. Can be added directly to feed or mixed to be administered through an oral syringe.