- A large-scale study, called the Iowa Women's Health Study, looked at the garlic, fruit, and vegetable consumption in 41,000 middle-aged women. Results showed that women who regularly consumed garlic, fruits, and vegetables had a 35% lower risk of developing colon cancer.
- Garlic may help the immune system function more effectively during times of need such as in cancer. In a study of 50 patients with inoperable colorectal, liver, or pancreatic cancer, immune activity improved after they were given aged garlic extract for 6 months.
- Studies also suggest that aged garlic supplementation may reduce the side effects of chemotherapy, including fatigue and anorexia (lack of appetite). Further, results found that aged garlic decreased heart and intestinal damage commonly seen with certain chemotherapy agents.
- Laboratory studies suggest that large quantities of fresh, raw garlic may have antiparasitic properties against the roundworm, Ascaris lumbricoides, which is the most common type of intestinal parasite. Garlic for this purpose, however, has not been tested in people.
- Fresh garlic contains allicin, which is reported to have antibacterial, antiviral, and antifungal properties. Some studies have reported that garlic consumption may kill bacteria known to cause ulcers, but there are also studies that report no effect on this bacteria. Several studies report that topical application of garlic may help treat fungal skin conditions, such as Tinea cruris and Tinea corporis.
- Preliminary studies show that garlic may help combat fatigue. More research is needed.