Synovi-MSM Granules, 720 Gram Container Veterinarian recommended A combination of MSM glucosamine HCl perna canaliculus vitamin C and minerals in a palatable chewable tablet. Canine joint supplement containing methylsulfonylmethane (msm) In clinical tests use of msm produced significant relief of pain and stiffness along with reduced swelling and inflammation. MSM prevents pressure build up in cells permitting nutrients in and pushing toxins