From wikipedia....
iIn Ayurvedic practices, turmeric is thought to have many medicinal properties and many in South Asia use it as a readily available antiseptic for cuts, burns and bruises. Practitioners of Ayurvedic medicine say it has fluoride which is thought to be essential for teeth. It is also used as an antibacterial agent.
It is taken in some Asian countries as a dietary supplement, which allegedly helps with stomach problems and other ailments. It is popular as a tea in Okinawa, Japan. Pakistanis also use it as an anti-inflammatory agent, and remedy for gastrointestinal discomfort associated with irritable bowel syndrome, and other digestive disorders.
It is currently being investigated for possible benefits in Alzheimer's disease, cancer and liver disorders.
Turmeric rhizome
In the latter half of the 20th century, curcumin was identified as responsible for most of the biological effects of turmeric. According to a 2005 article in the Wall Street Journal, research activity into curcumin is exploding. In that year supplement sales increased 35% from 2004, and the U.S. National Institutes of Health had four clinical trials underway to study curcumin treatment for pancreatic cancer, multiple myeloma, Alzheimer's, and colorectal cancer. Curcumin also enhances the production of brain-derived neurotrophic factor, or BDNF, which supports nerve growth.
There is evidence that piperine, found in black pepper, improves the absorption of turmeric. In 1998 researchers at St. John�s Medical College, Bangalore, India found that curcumin taken with 20 mg of piperine increased the absorption of curcumin by 2000%, with no adverse effects. This means that a low dose of curcumin (or turmeric for that matter) could have a greater effect in terms of health benefits when combined with piperine than a large dose of curcumin or turmeric would.