Dried or fresh horsetail can be made in to a tea by steeping the bristley leaves in hot water for 20 minutes or more. Horsetail can be dried easily by laying the fresh plant on an oven rack in a dry place for one to two days.
Horsetail contains silica and minerals, it is often is used to strengthen bone, hair, and fingernails — parts of the body that require high mineral levels. You may drink horsetail tea every day — for no longer than a month — if you’ve broken a bone. Horsetail also may be used by those who have wounds that do not heal well. Horsetail is classified as a diuretic, but sources differ as to its strength in this regard. Horsetail tea or tincture may help people who experience edema (fluid buildup) in the legs caused by such conditions as rheumatoid arthritis and circulatory problems.