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What Are The Side Effects of Black Garlic?

By Editorial Team (Y)
May 8, 2023

What Is Black Garlic?

Black garlic is a type of garlic that was exposed to fermentation under high heat (60–90°C or 140-194F) and humidity levels (70–90%) during the period of several weeks, resulting in dark-colored, softer, and sweeter garlic. Black garlic recently became popular for its unique taste and potential benefits for health. Although black garlic may have some advantageous effects on the body, it is important to note that it also has some potential side effects.

Potential Side Effects Of Black Garlic

One of the most common side effects of black garlic and its supplements is stomach upset. Consuming black garlic can result in nausea, vomiting, and diarrhea. High sulfur content in black garlic is probably the cause of gastrointestinal distress in some people. It is highly recommended to take black garlic in moderation if you are predisposed to stomach issues or have a sensitive digestive system. Moreover, it is essential to be mindful of how your body reacts and if any signs of discomfort arise. It is strongly recommended that you speak with a medical professional before consuming black garlic or any of its supplements.

Black garlic can also potentially affect blood pressure. Studies revealed that black garlic may contribute to blood pressure decreasing. While this may be helpful for individuals with high blood pressure, it can be dangerous for people with hypotension (low blood pressure). It is important to consult a health practitioner before eating black garlic if you have low blood pressure.

In addition, black garlic can potentially aid in decreasing blood sugar levels. Studies demonstrated that black garlic can help regulate blood sugar levels, and possibly benefit patients with diabetes. However, black garlic poses a risk of significantly lowering blood sugar levels in diabetic patients and can even result in a diabetic coma. Therefore, if you have diabetes, it is essential to consult your doctor before taking black garlic or its supplements.

Also, black garlic has an impact on the immune system. Studies indicated that black garlic has immune-boosting properties, potentially assisting in illnesses and disease prevention. Nevertheless, this effect can be detrimental to patients with autoimmune diseases as it could intensify their symptoms. Therefore, it is critical for those with autoimmune diseases to seek advice from their doctor before consuming black garlic or its supplements.

Finally, it is critical to mention that black garlic may interact with specific drugs. Specifically, black garlic may interact with blood-thinning medications, potentially increasing the risk of bleeding. Moreover, black garlic may interact with antihypertensive drugs (used to manage high blood pressure), drugs metabolized by the liver, medications used to prevent rejection of a kidney, heart, liver, or lung transplant, Isoniazid (an antibiotic used in the treatment of active tuberculosis infections or prevention of active tuberculosis infections in people who may be infected with the bacteria), antidiabetic medications, anticoagulants and antiplatelet drugs, medications used in hepatitis C therapy, and Saquinavir, Atazanavir, and other medications taken for HIV.

If you take the listed medicines, it is necessary to consult with a healthcare provider prior to consuming black garlic or its supplements.


Black garlic may have a number of potential health benefits, but it is important to be aware of its potential side effects, including upset stomach, impact on blood pressure and blood sugar levels, effect on the immune system, and interactions with certain medications. If you are considering consuming black garlic or its supplements, it is highly recommended to seek medical advice, especially if you have any concerns or pre-existing medical conditions. It is essential to take into consideration your overall health and well-being when making decisions about supplements or food, and you should be mindful of how your body is responding.

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