Contains 400 mg of MSM per tablet. MethylSulfonyMethane (MSM), a food supplement that has anti-inflammatory properties for reducing joint inflammation and allergic responses. Has been found to help in skin allergies and asthmatic problems. Dose is variable but starts at 500 mg per 30 lbs. Can be increased to effect. Comes in tablets and chewable form. Ingredients: MSM and natural flavoring.