Your body needs the mineral silicon for healthy development and maintenance of skin, hair, ligaments, tendons, and bones. Silicon is also necessary for the absorption of calcium that supports bone density. Silicon plays a role in the formation of collagen, an important component of connective tissue, such as cartilage and membranes around joints. Dietary sources of silicon include whole grains, green vegetables, fruits, and nuts. Mineral silicon is not well absorbed, making a plant-sourced supplement the preferred choice.