Alta Sil-X Silica Tabs Silica is an essential trace mineral that plays a biological role in the processes by which bone, cartilage, connective tissue and skin are formed and is a component of collagen. Using the finest quality European Horsetail Extract with bioflavonoids, Alta Health Silica provides the pure organic form of soluble/collodial Silica by means of the special extraction process patented by Prof. Louis Kervran.