Eating too much garlic can be a concern for some people. This is why garlic, as well as all herbs, should be taken with care and under the supervision of a qualified, botanical medicine healthcare provider.
In addition to possible medication interactions, side effects of garlic include bloating, bad breath and upset stomach. Garlic acts as a blood thinner and may increase the risk of bleeding. Garlic can increase or decrease the potency of some prescription medications.
The United States Food and Drug Administration has classified garlic as Generally Recognized as Safe, or GRAS. Some studies show that it can prevent heart disease. Moderate consumption of a few garlic cloves daily is considered safe for most people.