Also known as: Equisetum arvense, Scouring rush, Shavegrass
Horsetail (Equisetum arvense) is one of the richest plant sources of silica and has been used traditionally for bone, hair, nail, and urinary tract health. Preliminary studies support its diuretic properties and potential benefits for connective tissue.
Horsetail (Equisetum arvense) is a primitive vascular plant that has been used medicinally since ancient Greek and Roman times. It is exceptionally rich in silica (silicon dioxide), containing up to 25% dry weight as silicic acid, along with flavonoids (quercetin, kaempferol), phenolic acids, and minerals including potassium and manganese. Silica plays a structural role in connective tissue, and horsetail has been traditionally used to support bone mineralization, hair thickness, and nail strength. Clinical studies, though limited, have demonstrated a significant diuretic effect comparable to hydrochlorothiazide without causing electrolyte depletion. Small trials suggest improvements in nail brittleness and hair growth parameters. Horsetail also shows in vitro antioxidant and anti-inflammatory activity. It is available as dried herb for tea, standardized capsules, tinctures, and topical preparations. Long-term use should be monitored due to the presence of thiaminase, which may deplete thiamine (vitamin B1).
A randomized clinical trial demonstrated that horsetail extract produced a diuretic effect comparable to hydrochlorothiazide without significant electrolyte loss.
The high silica content of horsetail is proposed to support keratin structure. Small clinical trials have shown improvements in nail brittleness and hair growth after supplementation.
Divided into 2–3 doses daily with meals
Supplement with thiamine (vitamin B1) during long-term use due to the thiaminase content of horsetail. Avoid continuous use beyond 2 months without a break.
Consistent silica intake
Diuretic use and traditional preparation
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