Garlic Oil

Pronunciation: GAR-lik.

Generic name: garlic oil
Drug class: Herbal supplement (Allium sativum)
Form: Capsules, tablets, extracts (often enteric-coated); also creams, gels, pastes, mouthwashes
Route: Oral (also topical preparations available)
Legal status: Dietary supplement; not FDA-reviewed as a drug

Availability and supply rules vary by country

Trade names by country: United States

What garlic oil is and how it works

Garlic (Allium sativum) is an herbal supplement used for cardiovascular and metabolic health, including high blood pressure, cholesterol management, atherosclerosis, diabetes, and other conditions. It is not an FDA-approved drug. (1) (2)

The reviewed sources describe garlic generally rather than garlic-oil products specifically; whether the same benefits, dosing, and safety profile apply to garlic-oil formulations is not established. Garlic supplements are taken orally, typically in doses around 2400 mg daily for adults in studied contexts. They are available as tablets, capsules, and extracts. Garlic is not a replacement for prescribed medications; any use should be discussed with a healthcare provider, especially if taking other medicines.

Mechanism of action: how garlic oil works

Garlic may lower cholesterol by reducing liver production of cholesterol and increasing breakdown of LDL. It may also increase insulin production, contributing to blood sugar reduction. The active component allicin is responsible for many effects. (1) (2)

What garlic oil is used for

High blood pressure

Evidence from general garlic research (not garlic-oil-specific): Garlic may reduce systolic blood pressure by 7–9 mmHg and diastolic by 4–6 mmHg in people with hypertension. (1)

Cholesterol management

Evidence from general garlic research (not garlic-oil-specific): Daily garlic for 8 or more weeks may lower total and LDL cholesterol and increase HDL cholesterol. (1)

Atherosclerosis

Evidence from general garlic research (not garlic-oil-specific): Garlic appears to slow the progression of arterial hardening. (1)

Diabetes

Evidence from general garlic research (not garlic-oil-specific): Consistent use for 3 or more months may modestly reduce pre-meal blood sugar. (1)

Endometriosis

Evidence from general garlic research (not garlic-oil-specific): Daily garlic powder tablets for 3 months showed pain improvement in one study cited. (1)

Gum disease (periodontitis)

Evidence from general garlic research (not garlic-oil-specific): Aged garlic extract taken twice daily for 18 months improved mild-to-moderate periodontitis. (1)

Fatty liver disease (NAFLD)

Evidence from general garlic research (not garlic-oil-specific): Garlic may improve liver health in people with non-alcoholic fatty liver disease. (1)

Before taking garlic oil

Do not take / not appropriate for

Medicinal (supplement) amounts of garlic are described as possibly unsafe during pregnancy and while breastfeeding by the reviewed source; discuss use with a healthcare provider before starting. (all products) (1)
Anyone with a known allergy to garlic should discuss use with a healthcare provider before starting; whether allergy to other Allium-genus plants also applies is not established in the reviewed source. (all products) (1)

Tell your clinician about

If you take blood-thinning medications (e.g., warfarin, aspirin), because garlic can increase bleeding risk.
If you take medications for high blood pressure, as garlic may have additive effects.
If you take diabetes medications, as garlic may lower blood sugar.
If you take the HIV medication saquinavir, as garlic may reduce its effectiveness.
If you take medications metabolized by the liver, as garlic may alter drug breakdown.

(1) (2)

How to take garlic oil

In studied contexts, adults have commonly taken 2400 mg of garlic by mouth daily for up to 12 months.
Garlic supplements are often standardized to allicin content (typically 1.1%–1.3%). Follow the product label for specific dosage and enteric coating.
Do not exceed the recommended dose on the product label unless directed by a healthcare provider.
Whether taking garlic with food reduces stomach upset is not established in the reviewed sources.
Topical preparations (creams, gels) exist; the reviewed sources note that raw garlic applied to the skin can cause burn-like skin damage. Specific instructions for topical use are not established and remain unresolved.

(1)

Procedures and treatment changes

Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (1) (2)

Missed dose

Follow the exact product instructions and do not double a dose.

Overdose

Garlic overdose is not known to cause severe adverse effects. Excessive consumption of raw garlic may cause gastrointestinal upset and flatulence. If you suspect a serious reaction, contact a healthcare provider. (2)

Side effects

Garlic is generally well tolerated, but raw garlic and high doses can cause more side effects. These findings describe garlic generally; whether they apply specifically to garlic-oil products is not established in the reviewed sources.

Bad breath

What to notice: Evidence from general garlic research (not garlic-oil-specific): Garlic odor on breath and skin is common.

What to do: Whether enteric-coated supplements reduce odor is not established in the reviewed sources. Inform your healthcare provider if bothersome. (1)

Heartburn, gas, diarrhea

What to notice: Evidence from general garlic research (not garlic-oil-specific): Mild gastrointestinal symptoms are the most common side effects.

What to do: Whether taking with food or using enteric-coated forms reduces these symptoms is not established in the reviewed sources. Contact your healthcare provider if severe. (1)

Signs of bleeding

What to notice: Increased bleeding tendency (specific symptom details are not established in the reviewed sources).

What to do: Seek medical attention promptly if you notice unusual bleeding or bruising, especially if taking blood-thinning medications. (1)

Allergic reaction

What to notice: Signs of an allergic reaction (specific symptom details are not established in the reviewed sources).

What to do: Seek emergency medical care promptly if a severe reaction is suspected; let the clinician you see advise on whether to continue or stop this supplement. (1)

Skin burn from topical raw garlic

What to notice: Burn-like skin damage where raw garlic was applied.

What to do: Seek medical care if the skin reaction is severe or blistering; specific first-aid steps are not established in the reviewed sources. (1)

Serious warnings

Increased bleeding risk — high

Symptoms: Evidence from general garlic research (not garlic-oil-specific): Increased bleeding tendency (specific symptom details are not established in the reviewed sources).

Action: If you experience any signs of unusual bleeding, seek medical attention promptly. Anyone taking blood-thinning medications should consult their prescriber before using garlic supplements. (1)

Additive blood pressure lowering — medium

Symptoms: Evidence from general garlic research (not garlic-oil-specific): Possible additive blood-pressure-lowering effect (specific symptom details are not established in the reviewed sources).

Action: If you are on antihypertensive medications, discuss garlic use with your healthcare provider; a specific monitoring protocol is not established in the reviewed sources. (1)

Low blood sugar when combined with diabetes medicines — medium

Symptoms: Evidence from general garlic research (not garlic-oil-specific): Dangerously low blood sugar is possible (specific symptom details are not established in the reviewed sources).

Action: If you are on diabetes medications, discuss garlic use with your healthcare provider; a specific monitoring protocol is not established in the reviewed sources. (1)

Interactions

Medicine or test	Effect	Action
Blood-thinning medications (anticoagulants/antiplatelets, e.g., warfarin, aspirin)	Evidence from general garlic research (not garlic-oil-specific): Garlic may increase the risk of bleeding when taken with these medications.	Consult your prescriber before starting garlic. (1)
Blood pressure medications	Evidence from general garlic research (not garlic-oil-specific): Garlic may have additive blood-pressure-lowering effects.	Discuss with your healthcare provider before use. (1)
Diabetes medications	Evidence from general garlic research (not garlic-oil-specific): Garlic may lower blood sugar, which could lead to hypoglycemia if combined with diabetes medicines.	Discuss with your healthcare provider before use; any dosage adjustment is a decision for your prescriber. (1)
HIV protease inhibitor saquinavir	Evidence from general garlic research (not garlic-oil-specific): Garlic may reduce the absorption and effectiveness of saquinavir.	Consult your HIV specialist before using garlic supplements if you are taking saquinavir. (1)
Drugs metabolized by the liver (CYP2E1 and P-glycoprotein substrates)	Evidence from general garlic research (not garlic-oil-specific): Garlic may alter the breakdown rate of some medications, potentially reducing effectiveness or increasing side effects.	Inform your healthcare provider of all medicines you take before starting garlic. (2)

Pregnancy, breastfeeding, kidney/liver function, age

Pregnancy and breastfeeding

Garlic is likely safe in food amounts, but medicinal (supplement) amounts are possibly unsafe during pregnancy and breastfeeding. Insufficient data exist regarding topical use. Discuss with a healthcare provider before use. (1)

Children

Pediatric use, safety, and dosing are not established in the reviewed sources and remain unresolved.

People taking blood-thinning medications

Garlic can increase bleeding tendency, particularly when combined with blood-thinning medications. Discuss use with your healthcare provider. Whether garlic use should be discontinued before surgery is not established in the reviewed sources. (1)

Monitoring

Before starting

Review all current medications for potential interactions, especially blood thinners, blood pressure drugs, and diabetes medications.
Assess pregnancy or breastfeeding status.
Check for any known allergy to garlic.
Note: the reviewed sources describe garlic generally, not garlic-oil products specifically; product-specific evidence has not been reviewed.

During treatment

Be alert for signs of bleeding, blood pressure changes, or blood sugar changes if taking relevant medications, and report concerns to a healthcare provider. A specific monitoring protocol or frequency is not established in the reviewed sources.

(1)

Storage

No specific storage information was found in the reviewed sources and remains unresolved.

Professional information

Clinician-facing context only. This information is derived from supplement monographs and aggregated data describing garlic broadly (and garlic extracts/supplements generally), not garlic-oil products specifically, and not from an FDA-approved drug label. Whether garlic-oil formulations share the same allicin standardization, dosing, benefit, adverse-effect, and interaction profile as the garlic preparations described in these sources is not established. Always consult local guidelines and product-specific information.

All regions

Indication: Garlic supplement use

Dose summary: No universal dose is established for garlic-oil products specifically. In studies of garlic generally, adults have commonly used 2400 mg by mouth daily; formulations vary in allicin content, and product labels should be checked. This is not established as a garlic-oil-specific dose.

Renal context: No specific renal dosing guidance was found in the reviewed sources; this remains unresolved. (1)

Mechanism of action

Hepatic guidance

No specific hepatic impairment dosing guidance was found in the reviewed sources; this remains unresolved. Garlic may alter drug metabolism via CYP2E1 and P-glycoprotein substrates.

Overdose note

Overdose is not known to cause severe effects; excess raw garlic may cause gastrointestinal upset and flatulence. A specific treatment/management protocol is not established in the reviewed sources. (1) (2)

Frequently asked questions

Can garlic replace my blood pressure medicine?

Evidence from general garlic research (not garlic-oil-specific): No. Garlic is a supplement and should not replace prescribed medications. Always consult your doctor before making any changes to your treatment plan. (1)

Is it safe to take garlic if I'm on warfarin?

Evidence from general garlic research (not garlic-oil-specific): Garlic can increase the risk of bleeding when combined with warfarin. A person taking warfarin should discuss garlic use with their healthcare provider before using a garlic supplement; a specific monitoring protocol is not established in the reviewed sources. (1)

How much garlic should I take for cholesterol?

Evidence from general garlic research (not garlic-oil-specific): In studies, 2400 mg daily has been used, but the appropriate dose for you should be determined by a healthcare provider, considering the specific product and your health status. (1)

What is the mechanism of action of garlic oil?

What is the generic name of Garlic Oil?

The generic name is garlic oil. (1) (2)

What class of drug is garlic oil?

Garlic Oil is classed as: Herbal supplement (Allium sativum). (1) (2)

References

Garlic - Uses, Side Effects, and MoreWebMD · United States · accessed 2026-08-05 · source 1
Aggregated cross-checked garlic monograph factsWebMD, MedicineNet, Drugs.com, RxList · United States · accessed 2026-08-05 · source 2
CHICKEN DEWORMER POWDER (PEPPER, GARLIC, CHILI FLAKES, OEGANO, LINSEED OIL, WHEAT BRAN) POWDER [PEKOMET INC] — US prescribing information (DailyMed SPL)U.S. National Library of Medicine (DailyMed) · US · accessed 2026-08-14 · source 3
Garlic — patient drug information (MedlinePlus)U.S. National Library of Medicine (MedlinePlus) · US · accessed 2026-08-14 · source 4
garlic oil — RxNorm normalized drug concept (RXCUI 1309210)U.S. National Library of Medicine (RxNorm) · US · accessed 2026-08-14 · source 5

Brand names by country

Single-ingredient garlic oil names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.

Priority countries

United States

Wonder LaboratoriesWonder Laboratories
Puritan's PridePuritan's Pride
NOWNOW
Nature's BountyNature's Bounty
BulkSupplements.comBulkSupplements.com
DCDC
Vitamin WorldVitamin World
Source NaturalsSource Naturals
Sundown NaturalsSundown Naturals
SolgarSolgar

View brands in additional countries.