Garlic

This fact sheet provides basic information about garlic -- uses, potential side effects, and resources for more information. Garlic is the edible bulb from a plant in the lily family. It has been used as both a medicine and a spice for thousands of years.

What Garlic Is Used For

  • Garlic's most common uses as a dietary supplement product that contains vitamins, minerals, herbs or other botanicals, amino acids, enzymes, and/or other ingredients intended to supplement the diet. The U.S. Food and Drug Administration has special labeling requirements for dietary supplements and treats them as foods, not drugs. are for high cholesterol, heart disease, and high blood pressure.
  • Garlic is also used to prevent certain types of cancer, including stomach and colon cancers.

Using Garlic

Garlic, the cousin of the onion, enhances the taste of many foods. When cooking, break apart the head of garlic and remove the skin from individual cloves before chopping.

The smaller you chop garlic, the stronger the flavor. Chopping or pressing releases more of its essential oils, giving the strong garlic aroma.

Garlic cloves can be eaten raw or cooked. They may also be dried or powdered and used in tablets and capsules. Raw garlic cloves can be used to make oils and liquid extracts.

What Science Says About Garlic

Some evidence indicates that taking garlic can slightly lower blood cholesterol levels; studies have shown positive effects for short-term (1 to 3 months) use. However, an NCCAM-funded study on the safety and effectiveness of three garlic preparations (fresh garlic, dried powdered garlic tablets, and aged garlic extract tablets) for lowering blood cholesterol levels found no effect.

Preliminary research suggests that taking garlic may slow the development of atherosclerosis (hardening of the arteries), a condition that can lead to heart disease or stroke.

Evidence is mixed on whether taking garlic can slightly lower blood pressure.

Some studies suggest consuming garlic as a regular part of the diet may lower the risk of certain cancers. However, no clinical trials have examined this.

NCCAM is supporting studies looking at how garlic interacts with certain drugs and how it can thin blood.

Side Effects and Cautions for Garlic

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