Turmeric is a spice that comes from the root of the curcuma longa plant, which is a perennial in the ginger family. Its major active ingredient is curcumin. Curcumin has antioxidants and anti-inflammatory properties.
Turmeric has a warm, bitter taste and is frequently used to flavor or color curry powders, mustards, butters, and cheeses. Because curcumin and other chemicals in turmeric might decrease swelling, it is often used to treat conditions that involve pain and inflammation. People commonly use turmeric for osteoarthritis.