Prairie Naturals Ultra Silica - Silicon is essential to almost all parts of the human body, and is available from many unprocessed grains and vegetables. Unfortunately, processing and refining removes almost all silicon from these foods, making it difficult to replenish the body's silicon stocks through regular diet. Prairie Naturals Ultra Silica is an excellent source of natural vegetable silica (aqueous extract of Spring Horsetail), and trace minerals necessary for its proper assimilation. Silica supplementation encourages strong, elastic joints and connective tissue, cell metabolism and formation, and healthy skin, hair, nails and organs.