Garlic contains a wide spectrum of organic sulfur compounds that are thought to play important roles in health. The most important garlic sulfur compound appears to be allicin. Allicin is formed from the precursor alliin by the enzymatic action of allinase. Allicin and the other organosulfur compounds of garlic can support many functions in the body. For example, a number of clinical studies show that garlic supplements help support healthy cardiovascular function. Research also shows that garlic supports normal immune function, and that most of the organosulfur compounds in garlic have potent antioxidant properties. Garlic may be a useful dietary adjunct for individuals who wish to supplement their diet with this important herb.