Garlic is closely related to onions, leeks, shallots, scallions, and chives. For many years, it's been claimed that garlic can help fight cancer and infection. It's also said that garlic may be beneficial for stomach and abdominal problems.

Garlic contains many sulfides, one of which is alliin. When garlic bulbs are crushed, alliin is converted to another compound, allicin. Allicin seems to be one of the main active compounds in garlic and gives the root both its odor and its health benefits....