The 100% pure horsetail tea, or shavegrass, has been used in traditional medicine mainly for removing stones from the excretory system and for improving bone health. Strong Bones Shavegrass is a natural and gentle diuretic and is used as a natural remedy for excess fluid retention, kidney stones, bladder stones and urinary tract infections. It is traditionally used to speed up the excretion of kidney stones. Prior to using any herb to treat a condition, please consult a licensed health care provider.