Each vegetable-based non‑GMO capsule from New Roots contains 600 mg of premium-quality horsetail extract standardized to 7% silica. horsetail extract is an excellent source of silica (7%) in bioavailable form, essential for building the matrix necessary for strong and healthy bones, nails, hair, skin, and connective tissue. Horsetail is a perennial plant descended from enormous tree-like plants that thrived over 400 million years ago. The abundance of silica that gives strength to their large hollow stems have been recognized and harnessed for centuries for their medicinal value.