Prairie Naturals Ultra-Silica is a natural source of silica that nourishes hair, skin and nails while supporting the skeletal system. Ultra-Silica provides a superior source of organic silica from the aqueous extract of Spring Horsetail (Equisetum arvense). Specially processed to provide a readily assimilated and abundant source of trace minerals, Ultra-Silica strengthens and beautifies hair, skin, nails and, most importantly, bones!