I have been drinking horsetail for my torn ligaments and bad knees due to missing cartridge and horsetail healed me. I bought the tea in a local health food store for a very affordable price (20 teabags for $2.60). In the summer I pick my own horsetail, wash it, dry then crush and keep in jars (that's good for 1 year). Drink the tea for medicinal use 2-3 times daily for a month then take a break for 2 weeks and start again. I noticed the benefits right away. If you are pregnant or nursing, don't take it internally (use the hair wash or bath instead). Horsetail also strengthens your immune system. It is known for its anti-inflammatory, antibacterial, antimicrobial, antioxidant, coagulant, demulcent, diuretic and astringent activity.