OPTI-MSM is a type of Sulfuric Compound that is naturally present in the body. It is used to reduce inflammation and to lessen the severity of seasonal allergies. MSM is sometimes used to alleviate the symptoms experienced from hangovers. The sulphur provided in MSM is an important constituent in skin, hair and nails and it is also used to boost collagen.Ingredients: Please see image.Directions for Use: Please see image.