Horsetail (Equisetum arvense)

Horsetail (Equisetum arvense) is a primitive perennial plant with hollow, segmented stems—first producing spore-bearing yellowish fruiting stems in spring, then green, needle-like sterile stems reaching about 2 ft (60 cm). Rich in silica, it is valued for aiding connective tissue, bone, hair, and nail health, as well as for its mild diuretic and astringent qualities.

Mineral-Rich & Connective Tissue Support: High in silica, strengthening bones, hair, nails, and skin. Diuretic & Hemostatic: Helps flush out excess fluid and can control minor bleeding (e.g., blood in urine). Astringent & Vulnerary: Encourages wound healing and tissue repair; a decoction in baths or compresses soothes slow-healing sprains or fractures. Kidney & Bladder Aid: Mildly assists in kidney stone prevention, UTIs, and incontinence support due to antiseptic and diuretic properties.

Long-Term Use: Can deplete vitamin B1 (thiamine), so combining with a B-vitamin supplement is advised if taken for extended periods. Children: The powdered herb is not recommended, though a weak tea can be safe in mild cases. General: Large amounts or prolonged usage should be monitored by a healthcare professional.

An isolated case of lithium toxicity has been reported in a patient who took a herbal diuretic containing horsetail among other ingredients

Found across Europe, North Africa, northern Asia, and the Americas, horsetail typically grows in damp soils, near marshes and along riverbanks. The sterile stems are harvested in summer, carefully dried, discarding discolored parts.