Horsetail is a perennial pteridophyte found throughout Europe and in parts of Asia.
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Horsetail is used internally to increase the strength of bones, teeth, nails, and hair. It has also been used internally as an antiinfective, diuretic, and anticancer treatment, as well as to decrease gout, prevent urinary stones, treat menorrhagia, and increase strength. It is used externally to promote wound healing.