Free radical protection for digestive system health. Protect your digestive system and liver with the natural nutrition of turmeric! Chefs may be most familiar with turmeric as a spice used in curries, but herbalists know it as an outstanding natural tonic for the liver and gastrointestinal system. The key to turmeric's benefits appear to be its high concentration of natural compounds known as curcuminoids, which possess powerful antioxidant capabilities.