Horsetail helps to decrease blood pressure due to its diuretic effect, which increases the elimination of fluid from the body. This results in a reduction is fluid in the blood vessels, which also decreases the force at which the heart has to against to pump blood, decreasing blood pressure. In animal models, horsetail has been shown to have diuretic and antispasmodic activities, and it has been used in traditional medicine for centuries for edema, bladder and renal conditions and to promote healing of wounds
Horsetail contains silicon, which helps strengthen bone. For that reason, some practitioners recommend horsetail as a treatment for osteoporosis. It is also used as a diuretic, and as an ingredient in some cosmetics.