Preparation also effects garlic supplements. Conference presentations noted that these products include powders, oils and aged extracts, and different methods of preparation may yield different results. Garlic's numerous compounds are transformed into other substances, some of which have protective effects, and some that do not. Research studies have reported no direct link between cancer risk and the amount of garlic consumed, and experts believe that daily use of garlic is not necessary to derive its cancer prevention benefits. Garlic is also under study for possible heart-health benefits.
Studies also show that garlic decreases the tendency for blood cells to form undesirable clots.
Experts at this latest conference on garlic repeated earlier warnings that studies on garlic use should be interpreted carefully. For example, some population studies showing that people who eat more garlic have less cancer or heart disease fail to adjust the statistics for the effects of subjects' vegetable consumption. Since garlic use often goes along with vegetables, some of the benefits claimed for garlic could actually be due to greater vegetable consumption. Experts like the American Institute for Cancer Research emphasize that one of the most important steps we can take to lower risk of cancer is to eat a plant-based diet with a wide variety of vegetables. Open 9 a.m. to 5 p.m. EST, Monday-Friday, this free service allows you to ask a registered dietitian your questions regarding diet, nutrition and cancer.