Garlic Water Side Effects: Risks and Who Should Avoid It

DetoxWater Editorial Team•Published November 5, 2026

Garlic water can cause bad breath and body odor, stomach upset, and allergic reactions; it may also increase bleeding risk. The risks of garlic water depend partly on how much garlic is used and whether you eat it as well as drink the water.

Is garlic water safe? 4 possible side effects to know

There are 4 possible side effects to consider, although their frequency specifically from garlic water is not known. For other infusion ideas, use the ai infused water generator.

Garlic in ordinary food amounts is generally well tolerated by most people. Garlic water is less predictable: its concentration can vary with the amount of garlic, how it is prepared, and how long it steeps. Eating the garlic as well adds to your exposure.

The evidence below concerns garlic or garlic supplements, not specifically garlic water. A review of garlic adverse effects found that breath and body odor were the best-documented complaints; its discussion of serious reactions and interactions also included case reports. The order of the less common effects below is not a reliable ranking of their frequency in garlic water.

Can garlic water cause bad breath or body odor?

1. Breath and body odor

Garlic contains sulfur-containing compounds that contribute to its characteristic smell. After garlic is consumed, odor can persist on the breath and may also be noticeable in body odor. The strength of the smell can vary with how much garlic you consume and how it is prepared.

If the odor bothers you, use less garlic, avoid eating the pieces, or stop drinking garlic water. Brushing your teeth and cleaning your mouth may help with food particles, but it cannot necessarily eliminate odor caused by compounds absorbed into the body.

Evidence: Breath and body odor are well-documented effects of garlic intake in clinical trials, according to the review above. That evidence does not establish how often they occur after drinking strained garlic water.

Can garlic water upset your stomach?

2. Stomach discomfort

Garlic can cause digestive complaints such as stomach discomfort, gas, bloating, or diarrhea in some people. Garlic also contains fermentable carbohydrates, which may contribute to gas and bloating in people who are sensitive to them. Some components can move into the water during steeping, although the amount is not established here.

If garlic water upsets your stomach, stop drinking it and see whether the discomfort settles. Using less garlic or avoiding the garlic pieces may reduce exposure, but it is not a guarantee that symptoms will stop. People who already notice symptoms after eating garlic may prefer to avoid garlic water altogether.

Evidence: Digestive complaints are recognized with garlic, but the available studies listed here do not establish a dose or frequency for these symptoms from garlic water. Persistent or severe symptoms should not be assumed to be caused by the drink.

Can garlic water cause an allergic reaction?

3. Allergic reactions

A garlic allergy is an immune reaction and is different from an upset stomach or an aversion to the smell. Reactions can include hives, swelling, or, rarely, a severe reaction affecting breathing. The garlic does not have to be eaten as a solid for a reaction to be possible.

If you have a known garlic allergy, avoid garlic water; straining out the pieces does not make it reliably safe. If you develop a suspected reaction, stop consuming it and seek medical advice rather than testing it again yourself. Trouble breathing, throat swelling, or fainting requires emergency care.

Evidence: The garlic adverse-effects review describes allergic reactions reported in people, including rare severe reactions. Case reports cannot tell us how often garlic water causes an allergy.

Can garlic water increase bleeding risk?

4. Increased bleeding risk

Garlic can affect platelet function, which is involved in blood clotting. This creates a possible bleeding concern, particularly when garlic is consumed in concentrated amounts or alongside medicines that affect clotting. Unusual bruising or bleeding is a reason to contact a clinician.

If you take a blood thinner or an antiplatelet medicine, ask your clinician or pharmacist before regularly drinking garlic water. Tell your care team about it before surgery or a dental procedure as well. Do not stop or change a prescribed medicine on your own.

Evidence: The review reports possible effects on platelet function and coagulation and a potential interaction with anticoagulants such as warfarin. It does not establish that a particular amount of garlic water causes bleeding or define a safe amount with these medicines.

Who should avoid garlic water or be careful with it?

Avoid garlic water if you have a known garlic allergy. If garlic consistently causes uncomfortable digestive symptoms, avoiding the drink is a reasonable choice; a clinician can help assess persistent symptoms rather than assuming garlic is the only cause.

Ask a clinician or pharmacist before making garlic water a regular habit if you take warfarin, another anticoagulant, or an antiplatelet medicine such as aspirin or clopidogrel. Garlic may also interact with other medicines: the adverse-effects review raises concern about reduced effectiveness of the HIV medicine saquinavir. A medication review is especially useful if you are planning a procedure or have a bleeding disorder.

If you take medicine for high blood pressure, check before using concentrated garlic preparations regularly. A review of trials and meta-analyses found blood-pressure reductions with garlic supplements; it did not establish the effect of garlic water or prove an interaction with a particular medicine.

Garlic in ordinary meals is generally different from using concentrated garlic water as a daily health preparation. If you are pregnant or breastfeeding, ask your clinician about regular concentrated use because its safety as a drink is not well established. For children, ask a pediatric clinician before offering garlic water as a health preparation, especially if the child has an allergy or takes medication.

How much garlic water is safe to drink daily?

There is no established safe daily amount of garlic water in cups, milliliters, or garlic cloves. The evidence provided does not define a dose for the drink, and a single measure would not account for differences in preparation, medications, or individual sensitivity. More garlic is not necessarily better.

If you choose to drink it and have no reason to avoid garlic, keep the amount of garlic modest, in line with how you would normally use it in food. Stop if it causes discomfort, and ask a clinician for individual advice if you have a relevant condition or take medication. These precautions are not a guarantee against an allergic reaction or interaction.

For handling, keep infused water refrigerated while it steeps; general infused-water guidance suggests 2–4 hours for flavor. Keep it refrigerated and drink it within 24 hours for best flavor; discard it after 2–3 days, or sooner if it becomes cloudy, slimy, or sour-smelling. These storage times do not establish a safe garlic dose.

When should you see a doctor?

Get emergency help for trouble breathing, throat or tongue swelling, fainting, severe bleeding, vomiting blood, or black, tarry stools. These symptoms need urgent assessment regardless of whether garlic water seems responsible.

Contact a clinician promptly for unusual bruising or bleeding, a suspected allergic reaction, severe or persistent abdominal pain, or diarrhea that does not settle. Also seek advice if you feel dizzy or notice substantially reduced urination, which can accompany dehydration.

When you speak to a clinician, mention the garlic water, roughly how it was prepared, when you drank it, and whether you ate the garlic pieces. Bring a list of your medicines and supplements so possible interactions can be considered.

Frequently asked questions

Does straining garlic water make it safe for someone with a garlic allergy?

No. Straining removes the pieces but does not reliably remove everything from garlic that could cause a reaction.

Is garlic water safer than a garlic supplement?

There is not enough direct evidence to make a general comparison. Garlic preparations vary in concentration, and garlic water can still pose risks for someone with an allergy or a medication interaction.

Can drinking extra water get rid of garlic breath?

Water can help with hydration, but it is not a proven way to eliminate garlic breath. Some odor comes from compounds absorbed into the body, not just garlic left in the mouth.

Sources

  1. Garlic (Allium sativum L.): adverse effects and drug interactions in humans. Molecular nutrition & food research (2007). PubMed 17918162
  2. Garlic and Heart Disease. The Journal of nutrition (2016). PubMed 26764327