Equisetum Hyemale

Scientific Summary

Equisetum hyemale, known as horsetail, is a tall, jointed plant with a woody stem that grows in damp habitats. It is traditionally used as a diuretic, haemostatic, and astringent to support urinary tract and skin health, and sometimes applied externally to help wound healing. Because it contains high levels of silica and can increase urine production, it should be used in moderation, avoided by people with kidney problems or those taking other diuretics, and is not recommended for pregnant women.

Source: https://en.wikipedia.org/wiki/Horsetail, Trease & Evans Pharmacognosy 16th ed