Horsetail is an herbal remedy that dates back to ancient Roman and Greek times. It was used traditionally to stop bleeding, heal ulcers and wounds, and treat tuberculosis and kidney problems.
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.
It contains silica, which is thought to improve hair growth speed and strength along with potentially reducing dandruff.