Horsetail (Shavegrass) Herb and Powder Profile

Also known as

Equisetum arvense, scouring rush, shavegrass, and Field Horsetail,

Introduction

Horsetail 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.

Constituents

More 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 Used

The above-ground parts of the plant, dried, cut, and powdered.

Typical Preparations

Usually in tea, tinctures and encapsulations. Universally used in cosmetics.

Summary

Precautions

When taking horsetail powder for its diuretic effect, be sure to drink extra water for maximum benefit. Avoid if there are kidney stones. Don't take horsetail herb if you take an ACE inhibitor for high blood pressure and you have congestive heart failure, as the combination of the herb and the drug can cause accumulation of excessive potassium. Not recommended while pregnant. Toxicity similar to nicotine poisoning has been seen in children who ingest large amounts.