Garlic reduces high blood pressure, helps to prevent hardening of the arteries, or atherosclerosis, reduces the risk of developing rectal and colon cancers, and may lower stomach cancer risks, according to MedlinePlus. Consuming large amounts of garlic over several months often results in fewer tick bites.
MedlinePlus reports that high doses of aged garlic extract taken daily for 12 months lowers the number of new colon or rectal tumors. Some individuals taking a garlic powder to treat high blood pressure see an 8 percent reduction. A chemical in garlic called ajoene has antifungal properties, so it is used in a gel to treat ringworm, jock itch and athlete’s foot. While some studies show that diabetics who take Allicor, a garlic product, with their diabetes medication for up to 24 weeks see reductions in blood sugar, triglycerides and cholesterol, results are mixed.
The active ingredient in garlic that gives it odor is called allicin, explains WebMD. The amount of this unstable substance in garlic supplements is dependent upon how the supplement is prepared and varies from manufacturer to manufacturer. If the garlic is aged to mask the strong odor, the amount of available allicin is reduced, lowering the efficacy of the product. Garlic supplements that do not have enteric coatings may be damaged by stomach acid.