This invention relates to a dietary supplement which is a phytochemical composition. This composition is capable of controlling inflammatory conditions and preventing and curing cancer in mammals. The composition comprises a synergistic mixture of standardized Boswellia extract, salts of glucosamine, and curcuminoids optionally containing bromelain, chondroitin, methylsulphonylmethane, resveratrol, extracts of white Willow and ginger, and quercetin.