Fresh garlic has potent antiseptic, nutritive, antiviral and antifungal properties, due to the presence of a sulfur containing chemical compound known as allicin (allicin is also responsible for the strong smell of garlic). These properties make it excellent for both preventing colds and treating them. A recent study conducted by Authority Nutrition found that consuming high doses of garlic (approximately 2.5g of garlic extract per day) while infected can cause a 70% reduction in the duration of cold symptoms. Garlic is known to be effective against salmonella, streptococcus, chicken pox, measles, and scarlet fever among others.
As garlic is healthy, natural and relatively inexpensive, it poses several advantages over traditional antibiotic use. Unlike traditional antibiotics, garlic does not damage the beneficial bacteria in your body. Additionally, harmful bacteria do not develop resistance to garlic in the way in which they do with prescription antibiotics.