Horsetail, or shavegrass, is valuable for its high silica content, which makes it useful for strengthening and regenerating connective tissues. A number of commercial preparations containing horsetail extract are recommended for strengthening the hair and nails, and for speeding healing of bones and connective tissue. It is also beneficial for urinary tract infections, and although it is considered a mild diuretic (aquaretic), because of its astringency, horsetail is used for incontinence and bedwetting in children. Horsetail helps reduce inflammation or benign enlargement of the prostate. It is commonly used in Chinese medicine to reduce irritation and redness of the eyes. Externally, horsetail poultices are applied for bleeding wounds, rheumatism, fractures, and sprains.
