) Reach Equine Joint Supplement helps support healthy joints in horses. Helps maintain cartilage, connective tissue and joint mobility. Reach Joint Supplement contains 5000 mg glucosamine sulfate, 1750 mg MSM, 14.5 mg chondroitin sulfate, 1000 mg Ester-C, 37 mg bromelain and 3.5 mg perna mussel per oz. With antioxidants to help remove damaging free radicals. Pellets.