Common Name Standardized: horsetailOther: filed horsetail, shavegrass, shavetail grass Botanical Name Equisetum arvense L.Plant Family: Equisetaceae Overview IntroductionHorsetail has a recorded history going back to the Devonian period, almost 350 million years ago. The plant at that time was as tall as a modern palm tree. Horsetail, not to be confused with cat-tail, is possibly the most abundant source of silica in the plant kingdom, so much in fact that the herb can be used for polishing metal. It got the name "scouring rush" from this very application. It has had other uses during the ages including as an ingredient in shampoos, skincare products, and in dietary supplements. The German E commission describes its use for urinary tract problems and as a diuretic.ConstituentsMore than 2/3 in-organic constituents, primarily silica and potassium salts. Horsetail from European sources contains the anti-allergy compound quercetin, but the same herb from North American and Asian sources usually does not. The plant also contains small amounts of nicotine.Parts UsedThe above-ground parts of the plant, dried, cut, and powdered.Typical PreparationsUsually in tea, tinctures and encapsulations. Universally used in cosmetics. Precautions Specific: Not for use in persons with kidney disease.General: We recommend that you consult with a qualified healthcare practitioner before using herbal products, particularly if you are pregnant, nursing, or on any medications. For educational purposes only This information has not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.Your browser does not support JavaScript.To view this page, enable JavaScript if it is disabled or upgrade your browser.