GRAND FLEX 20LB, Grand Flex - powdered joint supplement for horses and dogs. Unique powdered joint supplement provides a powerfully effective formula that matches the right nutrients at the right levels to provide long-term support and therapeutic nutrition for optimal healthy joint function. Each 1 oz dose contains 5,000 mg glucosamine HCl, 5,000 mg vitamin C, 3,000 mg methionine, 250 mg manganese gluconate, 200 mg zinc gluconate, 200 mg lysine, 150 mg niacinamide, 100 mg citrus bioflavonoids, 100 mg yucca, 80 mg proline and 50 mg copper gluconate. Dosage: Horses - 2 oz daily for 3-4 wks, then 1 oz daily for maintenance; Dogs (50 lbs) - 1 tsp daily for 3-4 wks, then 1/2 tsp daily for maintenance. 3.75 lbs = 60 doses.