Natural Source of Silica. Food-grade diatomaceous earth is composed of approximately 85% silica. Trace mineral assists in strengthening tendons, cartilage, blood vessels, and bones. Diatomaceous Earth may offer positive benefits for cholesterol levels and encourage heart health. Nutrients such as silicon, calcium, sodium, magnesium, iron, and other trace minerals are available in diatomaceous earth, giving rise to a practically endless supply of health benefits. Most of these nutrients play a role in building and repairing of muscles and bones.