A catalyst is a chemical that helps one molecule turn into a slightly different molecule. In the human body, these catalysts are called enzymes. Each chemical reaction has a unique enzyme. For example, Estradiol (brand name Estrace) turns into Estriol with the help of the enzyme Indole-3-Carbinol. This reaction is important because women who are low in Estriol have been found to be more likely to get breast cancer. This important enzyme was discovered in broccoli, and is also in cauliflower and cabbage. You can also buy Estriol at a compounding pharmacy.
Estradiol ----------Indole-3-Carbinol----------> Estriol