Field horsetail (Equisetum arvense) is a primitive vascular plant exceptionally rich in organic silica (monosilicic acid, 5 to 8% of dry matter)—a biologically active, water-soluble, and highly bioavailable—distinct from mineral silica (silicon dioxide), which is poorly absorbed. This silica is an essential cofactor in the synthesis of type I collagen (the main component of bones, cartilage, skin, and tendons) and elastin—it stimulates fibroblasts to produce these essential structural proteins. Horsetail also contains flavonoids (quercetin, kaempferol), phenolic acids, vitamin C, calcium, and potassium. Organic silicon as a dietary supplement is the most concentrated form of bioavailable silica—it should be combined with horsetail to meet significant structural needs.
Horsetail is the go-to plant in herbal medicine for bone remineralization. Its organic silica stimulates the synthesis of bone collagen and improves the binding of calcium and phosphorus in the bone matrix—an action that complements calcium and vitamin D3 supplements. Arko Organic Horsetail Remineralization Capsules and Be-Life Organic Horsetail 800 (60 capsules) are formulated for post-fracture remineralization treatments and for the prevention of osteoporosis. Joint pain associated with osteoarthritis also benefits from horsetail—its silica stimulates the synthesis of cartilage collagen (type II) and proteoglycans, the two essential components of cartilage. A treatment course lasts 4 to 8 weeks and should be repeated 2 to 3 times a year.
Organic silica is a structural component of the keratin in hair and nails—horsetail improves their strength and reduces breakage after a 6- to 8-week course of treatment. Naturactive Elusanes Field Horsetail, EFG PhytoFrance Organic Horsetail, and Ladrôme EPP are the best-standardized forms for this use. For optimal results, the recommended combinations are:
Horsetail and bamboo (tabashir or exudate, 70–80% silica) are the two main plant-based sources of silica available in health food stores. Bamboo has a higher silica concentration, but its bioavailability varies depending on the dosage form. Horsetail (5–8%, monosilicic acid) is less concentrated but is immediately bioassimilable without special extraction. Horsetail is generally preferred for bone and joint applications, while bamboo is preferred for cosmetic hair applications. These two plants are complementary and are often combined in multi-active remineralization formulas.
Horsetail is one of the few plants that combines remineralizing and diuretic-draining effects. Its flavonoids and saponins promote the elimination of uric acid through the kidneys—which is beneficial for inflammatory rheumatism and gout. Horsetail herbal tea (IPHYM Cut Herb, 1 tablespoon per 250 ml of simmering water, steeped for 15 minutes) is the most economical form for joint-draining action. Herbalgem Organic Horsetail Mother Tincture (30 ml, 1DH gemmotherapy) utilizes the developing shoots, which are more concentrated in silica and growth factors than the mature plant.
