An herbal formula containing burdock root (Arctium lappa), Turkey rhubarb root (Rheum palmatum), sheep sorrel (Rumex acetosella), and slippery elm bark (Ulmus fulva) with potential immunostimulating, anti-inflammatory and anti-tumor activities. The exact chemical profile, their respective concentrations and the mechanism of action of Essiac are largely unknown due to the proprietary nature of the formula and product inconsistency. Several chemical classes in Essiac are consistently represented and may attribute to its therapeutic effect, including anthraquinone derivatives such as rhein and emodin, high molecular polysaccharides, and lignans such as arctigenin. However, all these chemicals are unlikely to occur in high concentrations in Essiac, and its potential therapeutic effect may be attributed to a potential synergistic effect of these various compounds. Check foractive clinical trials using this agent. OR An herbal tea mixture that contains burdock root, Indian rhubarb root, sheep sorrel, and slippery elm bark. It has been claimed to remove toxins from the body, make the immune system stronger, relieve pain, control diabetes, treat AIDS, reduce tumor size, increase cancer survival, and improve quality of life. No clinical trial using Essiac in humans has been reported in a peer-reviewed, scientific journal, and the FDA has not approved the use of Essiac for the treatment of any medical conditions.