55 different natural anti-cancer substances were tested on breast cancer cells – and one substance was the most effective: Piperine, the active compound in black pepper! That’s from the American Association for Cancer Research. In studies, they found piperine prevents cancer development. It basically forces pre-cancerous cells to die – and blocks the flow of blood that feeds cancerous cells. And you can get the benefits simply by adding a meager quarter teaspoon of black pepper to your meals every day. To get the biggest anti-cancer punch: Use freshly ground whole black peppercorns. They contain the highest levels of piperine.