While garlic is generally safe for most people, it can cause side effects in some individuals. Common side effects include bad breath, body odor, gastrointestinal discomfort, and allergic reactions. Additionally, high doses of garlic supplements may interact with certain medications, such as anticoagulants, leading to increased risk of bleeding. It is crucial to consult a healthcare provider before using garlic as a treatment, especially for those with underlying health conditions or those taking medications.