Doctor’s Best Curcumin C3 Complex(R) is a potent antioxidant that protects cells and tissues by fighting free radicals. It is also proven to support healthy joint function. Curcumin C3 Complex(R) contains a standardized extract of Curcuma longa root and supplies 95% total curcuminoids, including curcumin, bisdemethoxy curcumin and demethoxy curcumin. As curcumin is difficult to absorb we add, BioPerine(R), an extract of Black Pepper fruit that contains 95-98% piperine, as a natural bioenhancer.