Benefits
Supports Healthy Urinary Function
Horsetail has a long traditional and clinical history as a mild aquaretic, helping support healthy fluid balance and urinary output without disrupting electrolyte status when used at recommended amounts.
Contributes Bioavailable Silica
Silica is involved in the structural integrity of bone, cartilage, hair, skin, and nails. Horsetail provides a plant-based source of silicic acid that supplements the silicon naturally obtained from foods like whole grains and vegetables.
Supports Hair and Nail Strength
The combination of silica and flavonoids has made horsetail a popular component in beauty-from-within formulas aimed at supporting normal hair growth cycles, nail thickness, and skin firmness.
Promotes Bone Wellness
Silica plays a role in collagen cross-linking and bone matrix formation. Horsetail extracts have been explored as a complementary nutrient strategy alongside calcium and vitamin D for bone-health support.
Provides Antioxidant Flavonoids
Isoquercitrin and kaempferol glycosides in horsetail offer free-radical scavenging activity, supporting the body's defense against everyday oxidative stress.
Mechanism of action
Aquaretic Diuretic Action
Horsetail flavonoids and saponins increase urinary water excretion (an aquaretic effect) without major losses of sodium or potassium, distinguishing it from pharmaceutical loop diuretics.
Silica Bioavailability
Plant silica is converted into orthosilicic acid in the gut, which is then absorbed and incorporated into collagen, glycosaminoglycans, and bone matrix proteins.
Connective-Tissue Cross-Linking
Silicon is hypothesized to participate in cross-linking collagen and elastin fibers in skin, hair, cartilage, and bone, supporting structural strength and elasticity.
Antioxidant Flavonoid Activity
Isoquercitrin and kaempferol glycosides scavenge reactive oxygen species and modulate inflammatory signaling, providing cellular-defense support that complements the herb's mineral content.
Clinical trials
Preclinical model of age-related osteosarcopenia using standardized Equisetum arvense extract
Aged murine model with measurements of bone microstructure and muscle mass
Daily oral administration of standardized horsetail extract was associated with preservation of bone microarchitecture and muscle parameters compared with untreated controls, providing mechanistic support for its traditional use in bone wellness.
Animal study using digital radiography to measure bone mineral density
Wistar rats receiving Equisetum arvense extract
Bone mineral density measurements showed favorable changes in the horsetail-treated group versus controls, consistent with silica's role in bone matrix metabolism and supporting interest in further human research.