Garlic has a long history of use as a food and medicine. From Roman times through World War I, topical garlic preparations helped prevent war-wound infections. After running out of penicillin during World War II, Russian soldiers used it as an antibiotic. Purported uses in the present day include fighting infection, lowering blood pressure and cholesterol, and boosting the immune system. Many studies have produced mixed results, and whether it truly offers medicinal value has not been established, according to the Beth Israel Deaconess Medical Center. Using larger amounts for medicinal purposes might cause some adverse effects, and the more you take, the greater the chance they will occur. Talk to your doctor before using garlic therapeutically.
What is Too Much Garlic?
Unlike some foods and supplements, garlic does not have a documented safe upper limit that you should not exceed.This does not imply, however, that you can just take unlimited quantities without risk. Some dosing recommendations exist based on studies, and they can serve as a guide. Consuming mega-quantities of a food or supplement does not always translate to increased benefit. Ultimately, your doctor can determine the appropriate dose for your needs.
The suggested dose depends on the form: 2 g to 5 g fresh garlic, aged garlic extract 600 mg to 1,200 mg; freeze-dried garlic standardized to contain 0.6 percent alliin or 1.3 percent allicin at 400 mg three times a day.
Increased Bleeding Risk
Garlic possesses anti-clotting properties. On the positive note, this might decrease the risk of stroke and benefit the heart. This action, however, could pose a problem if you combine it with warfarin or other anticoagulant medications or if you have a bleeding disorder. Stop taking garlic at least one week before a surgical procedure.
Gastrointestinal Upset
Garlic, particularly in larger quantities, can cause nausea, bloating, gas, a burning feeling in the stomach and other gastrointestinal issues. Taking it with food might reduce these effects.
Other Adverse Effects
Other adverse effects associated with garlic include bad breath, body odor, fatigue, dizziness, headache, sweating, lightheadedness, low blood sugar, muscle aches and loss of appetite. The Memorial Sloan-Kettering Cancer Center notes case reports of individuals suffering kidney hematomas, life-threatening allergic reactions and chemical burns in the mouth.
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