NOW Foods Silica Supplement is a vegetarian supplement that will help build strong and healthy hair, skin and nails. Silica is a naturally occuring non-metallic element, also known as silicon. Silica is a component of certain bodily polysaccharide structures such as hair, skin, and nails. Our Silica is derived from Horsetail Extract and is throughly screened for potency and purity. We have complexed the silica in this supplement with other synergistic ingredients for a truly effective dietary supplement.