This herb contains an active ingredient that, once metabolized in the body, closely resembles the active ingredient in aspirin. This herb is predominantly used as a natural anti-inflammatory for symptomatic relief of gouty arthritis and as a pain-reliever for mild nerve-related pain such as headaches and toothaches. The German Commission E has approved this herb for rheumatic ailments, headaches, and diseases accompanied by fever. In fact, randomized, double-blind studies have found standardized extracts of this herb to be far more effective than placebo for treating chronic low back pain and osteoarthritis. What is this herb?