A non-essential mineral. Tissues such as arteries, tendons, skin, connective tissue, cornea and sclera (white of the eye) contain relatively large amounts of silicon. Collagen, the protein glue that holds us together, contains silicon in silanolate form. While vitamin C functions only as a catalyst in the formation of collagen, silicon is actually a structural part of collagen. Silicon containing substances are found in all cartilage and in the material binding cells together. Silicon may be needed for proper bone structure and growth.