Nature's Sunshine Kidney Activator (formally known as Nature's Sunshine K) is formulated with herbs that have been used traditionally to support the urinary system, with targeted support to the bladder and kidneys. Kidney Activator helps to strengthen and tone the urinary system, helps to relieve muscle spasms, soothe the nerves, stimulate urine flow to reduce lactic and uric acid build up, and helps to increase circulation to promote healing of tissues damaged by infection or inflammation.