Too Much Garlic: Side Effects, How Much to Eat, and More (2024)

Eating 1-2 garlic cloves daily can have health benefits, but more can cause bad breath, heartburn, stomach issues, and other unpleasant side effects. It’s best to enjoy it in moderation.

For many home chefs, garlic is a favorite spice to cook with, thanks to its pungent taste and aroma. It works especially well in stews, sauces, pizzas, and pasta dishes.

This powerful ingredient is linked to several health benefits due to its medicinal properties. However, despite its versatility and health benefits, some garlic lovers wonder if it’s possible to go overboard (1).

This article examines the research to determine whether you can eat too much garlic.

Too Much Garlic: Side Effects, How Much to Eat, and More (1)Share on Pinterest

Although garlic is a healthy addition to a balanced diet, eating too much may cause several side effects.

Increased risk of bleeding

One of the most serious side effects of eating too much garlic is an increased risk of bleeding, especially if you’re taking blood thinners or undergoing surgery.

This is because garlic has antithrombotic properties, meaning that it may prevent blood clots from forming (2).

Although garlic-induced bleeding is uncommon, one report detailed a case in which a person experienced increased bleeding after they regularly ate 12 grams of garlic — approximately 4 cloves — per day before surgery (3).

In another case study, a person experienced excessive discoloration and bruising after surgery. The possible cause was a dietary supplement the person had been taking, which contained fish oil and 10 mg of garlic concentrate, both of which affect blood clot formation (4).

Thus, it’s important to talk with your healthcare professional before using garlic supplements. If you’re taking any medications or set to have surgery, you should also consult a healthcare professional before adding garlic to your diet.

Garlic breath

Garlic contains a variety of sulfur compounds, which are often credited with its many health benefits (1).

However, these compounds may cause bad breath, especially when eaten in large amounts. This is especially true for raw garlic, as cooking decreases the content of these beneficial sulfur compounds (5, 6).

Still, you can try several home remedies to get rid of garlic breath.

Digestive issues

Like onions, leeks, and asparagus, garlic is high in fructans, a type of carb that may cause bloating, gas, and stomach pain in some people (7).

In fact, when those with a fructan intolerance eat a high fructan food, it isn’t fully absorbed in the small intestine. Instead, it travels to the colon intact and is fermented in your gut, a process that may contribute to digestive issues (7).

As such, people following a low FODMAP diet — an elimination diet intended to identify specific foods that trigger digestive issues — are often encouraged to limit their garlic intake (8).

Heartburn

If you have gastroesophageal reflux disease (GERD), you may want to consider lowering your garlic intake.

GERD is a common condition that occurs when stomach acid flows back up into your esophagus, causing symptoms like heartburn and nausea (9).

Garlic may decrease lower esophageal sphincter (LES) tone, which is the ability of the muscles at the bottom of your esophagus to close and prevent acid from entering. In turn, this may trigger acid reflux (10).

However, certain foods affect people with GERD differently. If you find that eating a lot of garlic doesn’t cause symptoms, it’s likely unnecessary to limit your intake (11).

Summary

Eating large amounts of garlic may cause garlic breath, digestive issues, and heartburn. In rare instances, it may increase your risk of bleeding, particularly during surgery or if you’re taking blood thinners.

Although no official recommendations exist for how much garlic you should eat, studies show that eating 1–2 cloves (3–6 grams) per day may have health benefits (1).

If you notice any side effects after eating more than this amount, consider reducing your intake.

Cooking garlic before eating it may also help prevent side effects like garlic breath, digestive issues, and acid reflux (11).

If you have any underlying health conditions or are taking medications, it’s best to talk with your doctor before making any changes to your diet or using any herbal supplements.

Summary

Although there are no official guidelines for how much garlic is too much, it’s best to stick to a few cloves per day and decrease your intake if you notice any side effects. Cooking it may also help prevent side effects.

Garlic is highly nutritious and associated with a variety of health benefits.

However, if you eat too much of it, it may cause side effects like bad breath, acid reflux, digestive issues, and an increased risk of bleeding.

Therefore, it’s best to enjoy this delicious spice in moderation and reduce your intake if you start to experience any adverse effects.

Just one thing

Try this today: If you can’t tolerate garlic, there are plenty of tasty garlic substitutes you can use. Try experimenting with other herbs and spices, such as peppercorn, fennel, horseradish, or ginger.

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Too Much Garlic: Side Effects, How Much to Eat, and More (2024)

FAQs

Too Much Garlic: Side Effects, How Much to Eat, and More? ›

Eating 1-2 garlic cloves daily can have health benefits, but more can cause bad breath, heartburn, stomach issues, and other unpleasant side effects. It's best to enjoy it in moderation. For many home chefs, garlic is a favorite spice to cook with, thanks to its pungent taste and aroma.

What should I do if I ate too much garlic? ›

If you're having a particularly garlic-heavy meal, eat apples for dessert or chew on fresh mint leaves. One study indicated that the chemical makeup of raw or heated apples, lettuce, and mint helped deodorize garlic breath. Hot green tea and lemon juice may also help.

Is there a limit to how much garlic you can eat? ›

Raw garlic also retains more allicin, which is the sulfur-containing compound responsible for many of garlic's beneficial health effects. For best results, aim for around 1–2 cloves per day and reduce your intake if you experience any side effects, such as heartburn, acid reflux, or increased bleeding.

How much garlic per day is safe? ›

Dosages generally recommended in the literature for adults are 4 g (one to two cloves) of raw garlic per day, one 300-mg dried garlic powder tablet (standardized to 1.3 percent alliin or 0.6 percent allicin yield) two to three times per day, or 7.2 g of aged garlic extract per day.

How do you fix too much garlic? ›

Certain ingredients can help to balance or neutralize the garlic taste. Acidic ingredients like lemon juice or vinegar can help to cut through the strong flavors of garlic. Adding dairy products like milk, cream, or yogurt can also help to mellow the taste and create a more balanced dish.

How is garlic toxicity treated? ›

If ingestion occurred within a few hours of treatment, the veterinarian may induce vomiting. Once vomiting is controlled, medical-grade activated charcoal may be administered. This can decrease absorption of the poisons from the gastrointestinal tract. Activated charcoal should only be administered by a veterinarian.

How much is too much garlic in one day? ›

You shouldn't add too much garlic to your diet, too quickly. "One to two cloves a day should be the maximum consumed by anyone," says Tracey Brigman, a food and nutrition expert at the University of Georgia. Eating more than that may cause upset stomach, diarrhea, bloating, or bad breath.

Why do I feel sick after eating too much garlic? ›

Garlic contains fructan, a compound that causes many problems for the stomach and intestines. Eating too much garlic will directly stimulate the digestive tract, which can damage the stomach lining. From there can cause symptoms of nagging, heartburn, flatulence even peptic ulcers.

How long does garlic stay in your system? ›

Science Of Stink: Blame Sulfur Compounds For Your Garlic Breath : The Salt A sulfur compound in garlic can linger in the body for up to two days, stinking up your breath, sweat and pee. Milk, parsley or citrus might help break it down more quickly or mask the stench.

Can too much garlic damage the liver? ›

1.0, 2.5 and 5.0 g/kg body weight/day of garlic showed significant (P<0.001) deterioration in liver function tests (LFT's) after 21, 14 and 7 days respectively. A 1.0 g/kg body weight/day dose of garlic was associated with marked histological damage in liver after 21 days.

Is 10 cloves of garlic a day too much? ›

How much should you eat? Although no official recommendations exist for how much garlic you should eat, studies show that eating 1–2 cloves (3–6 grams) per day may have health benefits ( 1 ). If you notice any side effects after eating more than this amount, consider reducing your intake.

Is it safe to take 1000mg of garlic a day? ›

Dosing. Suggested average daily doses include 2 to 5 g of fresh raw garlic; 0.4 to 1.2 g of dried garlic powder; 2 to 5 mg of garlic oil; 300 to 1,000 mg of garlic extract (as solid material); and 2,400 mg/day of aged garlic extract (liquid).

Is 5000 mg of garlic too much? ›

The most common dosage size is between 500-1500mg – up to 2500mg could be considered a large dose. However, 5,000mg garlic extract supplements do exist and can be safely taken in accordance to their instructions, if you're looking for the most effective supplement.

What neutralizes garlic? ›

Add lemon juice

This works particularly well with crushed garlic. The acid in lemon juice neutralizes alliinase, an enzyme produced by crushing garlic that causes our unfortunate odor situations.

How do you reverse eating too much garlic? ›

Garlic Can Cause Gastrointestinal Upset

This is especially likely if you are eating more garlic than you normally do or if you consume raw garlic. If you have an upset stomach after eating garlic, you can try eating bland foods such as rice, bananas or bread.

What happens if you eat too much garlic in one sitting? ›

A few words of caution

And, despite garlic's many health benefits, don't add too much to your diet too quickly. Overdoing it can cause discomfort, including upset stomach, bloating, diarrhea, body odor and bad breath.

How to stop stomach pain after eating garlic? ›

If you have a food intolerance to garlic, your doctor may recommend that you stop eating it. They may also suggest medications, such as over-the-counter antacids, to help with your symptoms.

What happens when you eat excess garlic? ›

Eating too much garlic will directly stimulate the digestive tract, which can damage the stomach lining. From there can cause symptoms of nagging, heartburn, flatulence even peptic ulcers. Allicin in garlic can cause hemolysis, leading to anemia.

What is the antidote for garlic? ›

Chewing parsley after eating is an age-old remedy for garlic or onion breath. This herb cleanses the palate and masks unpleasant odors. Mint leaves have also been shown to significantly reduce garlic breath.

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