From the Manufacturer:
Best Curcumin w/Bioperine contains a standardized extract of Curcuma longa root, commonly known as Turmeric. Turmeric is the yellow spice that gives flavor to curried dishes. In the Far East, Turmeric is valued for more than just its culinary uses. The herb has been employed in the Ayurvedic healing tradition for centuries as a folk remedy. The active ingredients in Curcuma longa are a group of plant substances called curcuminoids. Known collectively as curcumin, curcuminoids have demonstrated potent antioxidant properties in scientific studies. Curcuminoids benefit joints and other tissues by helping to neutralize free-radicals.