Equisetum hyemale Tea made from this herb has been used in Austria and Germany for its actions as an astringent, depurative, diaphoretic and diuretic. The high silica content of this herb is believed to make it particularly effective in treating pulmonary consumptions. It improves the texture and tone of hair, nails, and skin and greatly strengthens bones and teeth. Some believe that this herb-has a hidden "youth factor" .