Achyranthes Bidentata (niu xi) 牛膝

Nature: Neutral and mild; bitter and sour; attributive to liver and kidneys.

Characteristics: Roots of a perennial herb with greenish purple stems and large purple joints that resemble the knee of an ox, hence the Chinese name is "ox-knee". A superior herb highly recommended for bladder and urinary tract problems and menstrual disorders.

Therapeutic effects: Diuretic and relieve edema; promote blood circulation to remove blood clots and bruising; treat menstrual disorders; ease joints and strengthen bones and muscles; relieve pain in knees and lower back.