Field horsetail (Equisetum arvense) is a medicinal plant known for its high silica content. The silica helps strengthen bones, hair, and nails, and is also thought to improve skin health. Its mechanism of action involves promoting tissue repair and acting as a diuretic, aiding in fluid balance and urinary tract health. It is commonly used to treat conditions like edema, kidney stones, and urinary infections, as well as to promote wound healing. Additionally, field horsetail is sometimes used to strengthen connective tissues and improve joint health.