Silica is a necessary for the formation of collagen needed for the bones and connective tissue, it is often recommended for the maintenance of healthy, hair, skin and nails. Natural Factors Silica extract is derived Horsetail (Equisetum arvens) and is guaranteed minimum 2% organic silicon. With regular supplementation of Silica many people often notice an improvement in the strength of nails, texture of hair and elasticity if their skin. An ideal supplement for long lasting good health and beauty.