Bio-MSM is a combination nutritional supplement containing MSM (methyl sulphonyl methane) and silica. MSM is a naturally occurring organic sulphur containing substance, which is found in grain products, legumes, eggs and red meat. Vegetal silica, an extract of the herb horsetail grass, is a natural source of the essential trace mineral silicon. Sulphur and silicon are required by the body for the normal growth and development. The level of silica in the body declines with aging.