Garlic Oil Ingredients & Drug Interactions
by Source Naturals
What is this page for?
First and foremost: checking Garlic Oil against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
Garlic Oil is a dietary supplement by Source Naturals with 1 active ingredient. Its ingredients are commonly taken for high blood pressure, high cholesterol, heart health.Based on those ingredients, 989 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Garlic oil. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Garlic Oil by Source Naturals
Ask about any prescription or over-the-counter medication and we check it for interactions with Garlic Oil by Source Naturals — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Garlic Oil by Source Naturals
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
This product contains a single active ingredient: garlic oil. It's softgel capsule made with soybean oil, gelatin, glycerin, silica, and purified water as inactive ingredients.
Does it work?
Moderate evidence
The evidence we hold suggests garlic oil is possibly effective for several conditions: diabetes, hypertension (high blood pressure), periodontitis (gum disease), atherosclerosis (narrowed arteries), and nonalcoholic fatty liver disease. That means there's some research showing benefit, but the evidence isn't yet strong or complete enough for us to call it proven.
Talk with your doctor about whether this fits your health goals.
How safe is it?
Well-documented data
Taken by mouth, garlic is generally well tolerated, though it commonly causes stomach upset, gas, bloating, nausea, body odor, and bad breath. Allergic reactions occur in sensitive people.
Rare but serious concerns include an increased bleeding risk, which matters if you already have a bleeding disorder or take blood thinners. The safety data shows pregnancy ratings of both "Likely Safe" and "Possibly Unsafe" — there isn't enough consistent information to know either way.
Lactation is rated Likely Safe. Because pregnancy safety is mixed, talk with your doctor or pharmacist about whether this is right for you if you're pregnant, trying to become pregnant, or breastfeeding.
Meds to double-check
Moderate interaction found
Before taking this product, check with your doctor or pharmacist if you take blood thinners or warfarin (Coumadin), blood pressure medications, diabetes medications, HIV protease inhibitors, tacrolimus (an immunosuppressant), or drugs metabolized by liver enzymes CYP3A4 or CYP2E1. Garlic may change how these drugs work or raise your bleeding risk.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.
Source Naturals Garlic Oil may help with blood sugar control, blood pressure, or liver health, though the evidence is still developing. The big caution is its interaction with blood thinners and other major medication classes — if you take any prescription drugs, especially for your heart, blood pressure, diabetes, or immune system, check with your doctor or pharmacist before starting.
Otherwise, expect common side effects like stomach upset and garlic breath.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Dec 22, 2019.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about Garlic Oil, straight from the product label.
| Brand | Source Naturals |
|---|---|
| Barcode (UPC) | 021078002130 |
| Net contents | 100 Softgel(s) |
| Market status | On market |
| Date entered into DSLD | Dec 22, 2019 |
| DSLD ID | 211665 |
| Product type | Botanical |
| Supplement form | Softgel Capsule |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar Free |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for Garlic Oil by Source Naturals, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Garlic oil | 10 mg | -- |
Other ingredients: Soybean Oil, Gelatin, Glycerin, Silica, purified Water
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
FDA Statement of Identity
Dietary Supplement
Formulation
Tasteless & Odorless
Contain no yeast, dairy, egg, gluten, corn or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.
Precautions
Contains soy.
Do not use if either tamper-evident seal is broken or missing.
Keep out of the reach of children.
Note: If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.
General Statements
Garlic and its key constituents have been the subject of hundreds of scientific studies. Garlic has been used worldwide for thousands of years for nutrition and health.
Formula
Source Naturals Garlic Oil contains true oil of garlic extracted from whole fresh garlic bulb, and suspended in pure soybean oil. It is a convenient way to receive the benefits of garlic in concentrated form, without the taste and odor.
Suggested/Recommended/Usage/Directions
Suggested Use: 1 softgel 1 to 2 times daily with meals.
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Garlic Oil by Source Naturals label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in Garlic Oil by Source Naturals
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size2 Softgel(s) Dosage formSoftgel Capsule Servings per container50 Amounts shown are per serving.
Garlic oil
Interacts with989 drugs
Garlic is a common food and supplement that may modestly help with blood pressure and cholesterol, though the evidence is mixed and effects are usuall...
Garlic oil monograph & interactionsOther (inactive) ingredients: Soybean Oil, Gelatin, Glycerin, Silica, Purified Water. These complete the product’s ingredient list but are not active constituents.
Garlic Oil by Source Naturals Drug Interactions
HelloPharmacist Interaction Report
Source Naturals Garlic Oil contains garlic oil, which has documented interactions with multiple medication types.
The most serious concern is with blood thinners (anticoagulant or antiplatelet drugs) and warfarin specifically — garlic may increase bleeding risk by interfering with how your blood clots.
Read the full breakdown — every affected drug type, severity by severity
Garlic also interacts with blood pressure medications (antihypertensive drugs), diabetes medications, and several others through different mechanisms. It may lower blood pressure and blood sugar on its own, which could compound the effect of your medications.
Additionally, garlic can affect how your body processes certain drugs through liver enzymes (CYP3A4 and CYP2E1 substrates), potentially raising or lowering their levels. Protease inhibitors (HIV medications) and tacrolimus (an immunosuppressant) are also of concern — garlic may decrease protease inhibitor levels or raise tacrolimus levels, in one case causing liver injury.
Altogether, these interactions span 990 individual medications. Before you start this product, check your exact medications with the tool on this page, and talk it over with your doctor or pharmacist — especially if you take any blood thinners, blood pressure pills, diabetes medications, or HIV or transplant drugs.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Garlic Oil?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Garlic Oil interact with 989 drugs. Click any drug to see the details.
1 of the 1 ingredient in Garlic Oil interact with drugs. Each result below shows which ingredient is responsible. Garlic oil
Acetaminophen, Chlorpheniramine, Dextromethorphan, PseudoephedrineChildren's Tylenol Cold Plus Cough, Tylenol Cold Ex Strength
How Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interactionAcetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, SalicylamideRhinogesic GG
How Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, Salicylamide interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Theoretically, garlic products containing allicin might induce intestinal CYP3A4 and inhibit hepatic CYP3A4.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, Salicylamide interactionAcetaminophen, Chlorpheniramine, PhenylephrineAlka-Seltzer PLUS, Histex SR, Protid
How Acetaminophen, Chlorpheniramine, Phenylephrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Phenylephrine interactionAcetaminophen, Chlorpheniramine, Phenylephrine, SalicylamideRhinogesic, Rhinogesic JR
How Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interactionAcetaminophen, Chlorpheniramine, PhenylpropanolamineAlumadrine, Conex, Sinadrin Max Strength, Sinulin
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Theoretically, garlic products containing allicin might induce intestinal CYP3A4 and inhibit hepatic CYP3A4.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Phenylpropanolamine interactionAcetaminophen, Chlorpheniramine, Phenylpropanolamine, OpiumHista-Derfule
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Opium interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Opium interactionAcetaminophen, Chlorpheniramine, Phenylpropanolamine, PhenyltoloxamineNorel Plus
How Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Phenyltoloxamine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Phenylpropanolamine, Phenyltoloxamine interactionAcetaminophen, Chlorpheniramine, PseudoephedrineAlka-Seltzer PLUS Liquid Gels, Children's Tylenol Cold, Codimal, Comtrex, Extra Strength Tylenol Allergy Sinus, Lorsin +3 more
How Acetaminophen, Chlorpheniramine, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Theoretically, garlic products containing allicin might induce intestinal CYP3A4 and inhibit hepatic CYP3A4.
Read the full Garlic Oil + Acetaminophen, Chlorpheniramine, Pseudoephedrine interactionAcetaminophen, ChlorzoxazoneAcetazone Forte, Extra Strength Tylenol Aches & Strains, Parafon Forte
How Acetaminophen, Chlorzoxazone interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Chlorzoxazone interactionAcetaminophen, Chlorzoxazone, CodeineAcetazone Forte C8, Parafon Forte C8
How Acetaminophen, Chlorzoxazone, Codeine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Chlorzoxazone, Codeine interactionAcetaminophen, CodeineTylenol No.3, Tylenol w/ Codeine
How Acetaminophen, Codeine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Codeine interactionAcetaminophen, Codeine, DoxylamineMersyndol
How Acetaminophen, Codeine, Doxylamine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Codeine, Doxylamine interactionAcetaminophen, Codeine, MethocarbamolAcetaminophen, Codeine, Methocarbamol, Robaxacet 8
How Acetaminophen, Codeine, Methocarbamol interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Codeine, Methocarbamol interactionAcetaminophen, Dexbrompheniramine, PseudoephedrineSinadrin Plus
How Acetaminophen, Dexbrompheniramine, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dexbrompheniramine, Pseudoephedrine interactionAcetaminophen, DextromethorphanTylenol Cough Ex Strength
How Acetaminophen, Dextromethorphan interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dextromethorphan interactionAcetaminophen, Dextromethorphan, Doxylamine, PseudoephedrineVicks NyQuil
How Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Theoretically, garlic products containing allicin might induce intestinal CYP3A4 and inhibit hepatic CYP3A4.
Read the full Garlic Oil + Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine interactionAcetaminophen, Dextromethorphan, Guaifenesin, PhenylephrineConar-A
How Acetaminophen, Dextromethorphan, Guaifenesin, Phenylephrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dextromethorphan, Guaifenesin, Phenylephrine interactionAcetaminophen, Dextromethorphan, Guaifenesin, PhenylpropanolamineAnatuss
How Acetaminophen, Dextromethorphan, Guaifenesin, Phenylpropanolamine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Theoretically, garlic products containing allicin might induce intestinal CYP3A4 and inhibit hepatic CYP3A4.
Read the full Garlic Oil + Acetaminophen, Dextromethorphan, Guaifenesin, Phenylpropanolamine interactionAcetaminophen, Dextromethorphan, Guaifenesin, PseudoephedrineRobitussin Cold, Severe Cold, Suphedrine Cold/Cough
How Acetaminophen, Dextromethorphan, Guaifenesin, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dextromethorphan, Guaifenesin, Pseudoephedrine interactionAcetaminophen, Dextromethorphan, Phenylpropanolamine, PyrilamineTheracaps
How Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine interactionAcetaminophen, Dextromethorphan, PseudoephedrineAlka-Seltzer PLUS Flu Liquid Gels, Non Aspirin Cold Caps, Tylenol Cold, Tylenol Flu Daytime Ex Strength, Tylenol Flu Ex Strength
How Acetaminophen, Dextromethorphan, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 3a4 (cyp3a4) Substrates, Cytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Theoretically, garlic products containing allicin might induce intestinal CYP3A4 and inhibit hepatic CYP3A4.
Read the full Garlic Oil + Acetaminophen, Dextromethorphan, Pseudoephedrine interactionAcetaminophen, Dichloralantipyrine, IsomethepteneAmidrine, Midchlor, Migquin, Migratine
How Acetaminophen, Dichloralantipyrine, Isometheptene interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dichloralantipyrine, Isometheptene interactionAcetaminophen, Dichloralphenazone, IsomethepteneMidrin
How Acetaminophen, Dichloralphenazone, Isometheptene interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dichloralphenazone, Isometheptene interactionAcetaminophen, Dichlorophenazone, IsometheptaneIsocom
How Acetaminophen, Dichlorophenazone, Isometheptane interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Dichlorophenazone, Isometheptane interactionAcetaminophen, DiphenhydramineTylenol PM, Tylenol PM Ex Strength
How Acetaminophen, Diphenhydramine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Diphenhydramine interactionAcetaminophen, Diphenhydramine, PseudoephedrineChildren's Tylenol Allergy, Cold Control, Contac Night Allergy Relief
How Acetaminophen, Diphenhydramine, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Diphenhydramine, Pseudoephedrine interactionAcetaminophen, Doxylamine, PseudoephedrineEx Strength Tylenol Sinus Nighttime
How Acetaminophen, Doxylamine, Pseudoephedrine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Doxylamine, Pseudoephedrine interactionAcetaminophen, HydrocodoneAnexsia, Anodynos DHC, Azdone, Co-Gesic, Doucet, Lorcet +9 more
How Acetaminophen, Hydrocodone interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates, Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Hydrocodone interactionAcetaminophen, IbuprofenCombogesic
How Acetaminophen, Ibuprofen interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilAnticoagulant/antiplatelet Drugs, Cytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Garlic Oil + Acetaminophen, Ibuprofen interactionAcetaminophen, MeperidineDemerol APAP
How Acetaminophen, Meperidine interacts with Garlic Oil — through 1 ingredient. Tap an ingredient for the detail:
Garlic OilCytochrome P450 2e1 (cyp2e1) Substrates Moderate
Interaction Summary
Garlic might increase levels of drugs metabolized by CYP2E1.
Read the full Garlic Oil + Acetaminophen, Meperidine interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Garlic Oil with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.
Garlic oil
Anticoagulant/Antiplatelet Drugs
Garlic may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Raw garlic and a variety of garlic extracts have antiplatelet activity and can increase prothrombin time.
Antidiabetes Drugs
Theoretically, taking garlic with antidiabetes drugs might increase the risk of hypoglycemia.
Clinical research suggests that garlic and garlic extract lower blood glucose levels in healthy and diabetic individuals.
Antihypertensive Drugs
Theoretically, taking garlic with antihypertensive drugs might increase the risk of hypotension.
In human research, both garlic and garlic extracts have blood pressure-lowering effects.
Atazanavir (Reyataz)
Theoretically, garlic might decrease levels and effects of atazanavir.
In a case report, a patient consuming six stir-fried garlic cloves three times weekly developed suboptimal atazanavir levels and increases in HIV viral load. While the exact cause of this interaction is unclear, there is speculation that garlic might decrease the intestinal absorption of atazanavir or increase its metabolism by inducing cytochrome P450 3A4 (CYP3A4). Until more is known, advise patients not to consume large amounts of garlic while taking atazanavir.
Cytochrome P450 2E1 (Cyp2E1) Substrates
Garlic might increase levels of drugs metabolized by CYP2E1.
Clinical research suggests garlic oil can inhibit the activity of CYP2E1 by 39%. Use garlic oil cautiously in patients taking drugs metabolized by these enzymes.
Cytochrome P450 3A4 (Cyp3A4) Substrates
Theoretically, garlic products containing allicin might induce intestinal CYP3A4 and inhibit hepatic CYP3A4. This may increase or decrease levels of drugs metabolized by CYP3A4.
Some human research suggests that garlic may induce INTESTINAL CYP3A4, reducing levels of drugs metabolized by this enzyme. This is primarily based on a study showing that taking a specific allicin-containing garlic product (GarliPure Maximum Allicin Formula, Natrol Inc.) twice daily for 3 days reduces saquinavir levels by approximately 50%. It is speculated that the allicin constituent induced CYP3A4 in the gut mucosa. Another study shows that giving docetaxel intravenously, bypassing the CYP3A4 enzymes in the gut mucosa, along with the same specific garlic product for 12 consecutive days, does not affect docetaxel levels. Conversely, there is concern that garlic may inhibit HEPATIC CYP3A4. In a single case report, increased tacrolimus levels and liver injury occurred in a liver transplant patient after taking a specific garlic supplement (Garlicin Cardio, Nature's Way) at up to three times the manufacturer recommended dose for 7 days. Several other studies have evaluated the impact of other garlic formulations on CYP3A4 substrates and have found no effect. Most of the products in these studies provided little or no allicin.
Isoniazid
Theoretically, garlic might decrease levels of isoniazid.
Animal research suggests that an aqueous extract of garlic reduces isoniazid levels by about 65%. Garlic reduced the maximum concentration (Cmax) and area under the curve (AUC), but not the half-life, of isoniazid. This suggests that garlic extract might inhibit isoniazid absorption across the intestinal mucosa; however, the exact mechanism of this potential interaction is not known.
Protease Inhibitors (Pis)
Theoretically, garlic products containing allicin might decrease levels of PIs.
Protease inhibitors are metabolized by cytochrome P450 3A4 (CYP3A4) isoenzymes. There is concern that garlic products containing allicin might induce intestinal CYP3A4, reducing plasma levels of protease inhibitors. This is primarily based on a study showing that taking a specific garlic product (GarliPure Maximum Allicin Formula, Natrol Inc.) twice daily for 3 days reduces levels of saquinavir, a PI, by approximately 50%. It is speculated that the allicin constituent induce CYP3A4 in the gut mucosa. Several studies have evaluated the impact of other garlic formulations on CYP3A4 substrates and have found no effect. Most of the products in these studies provided little or no allicin.
Saquinavir (Fortovase, Invirase)
Theoretically, garlic containing allicin might decrease levels of saquinavir.
Saquinavir is a substrate of cytochrome P450 3A4 (CYP3A4) isoenzymes. There is concern that garlic products containing allicin might induce intestinal CYP3A4 and cause subtherapeutic levels of saquinavir. This is primarily based on a pharmacokinetic study showing that taking a specific garlic product (GarliPure Maximum Allicin Formula, Natrol Inc.) twice daily for 3 days reduces saquinavir levels by approximately 50%. It is speculated that the allicin constituent induces CYP3A4 in the gut mucosa. Several pharmacokinetic studies have evaluated the impact of other garlic formulations on CYP3A4 substrates and have found no effect. Most of the products in these studies provided little or no allicin. Until more is known about this potential interaction, use garlic containing allicin cautiously in patients taking saquinavir.
Sofosbuvir (Sovaldi)
Theoretically, taking garlic with sofosbuvir might decrease its effectiveness.
Animal research in rats shows that giving aged garlic extract 120 mg/kg orally daily for 14 days decreases the area under the concentration time curve (AUC) after a single sofosbuvir dose of 40 mg/kg by 36%, increases the clearance by 63%, and decreases the plasma concentrations at 1 and 8 hours by 35% and 58%, respectively. This interaction is hypothesized to be due to induction of intestinal P-glycoprotein expression by garlic.
Tacrolimus (Prograf)
Theoretically, garlic might increase levels of tacrolimus.
In one case report, a liver transplant patient taking tacrolimus experienced increased tacrolimus levels and liver injury after taking a specific garlic supplement (Garlicin Cardio, Nature's Way) at up to three times the manufacturer recommended dose for 7 days. It is speculated that garlic inhibited hepatic cytochrome P450 3A4 (CYP3A4), which increased plasma levels of tacrolimus.
Warfarin (Coumadin)
Theoretically, garlic might increase the risk of bleeding with warfarin.
Raw garlic and a variety of garlic extracts have antiplatelet activity and can increase prothrombin time. In addition, there is a report of two patients who experienced an increase in a previously stabilized international normalized ratio (INR) with concomitant garlic and warfarin use. However, this report has been subsequently debated due to limited clinical information. Other clinical studies have not identified an effect of garlic on INR, warfarin pharmacokinetics, or bleeding risk. More evidence is needed to determine the safety of using garlic with warfarin.
Brand information
Manufacturer and brand details for Garlic Oil, from the product label.
Source Naturals
- Name
- Source Naturals, Inc.
- Street Address
- P. O. Box 2118
- City
- Santa Cruz
- State
- CA
- ZipCode
- 95062
- Web Address
- www.sourcenaturals.com
Garlic Oil by Source Naturals: Common Questions
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Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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The Full Monographs Behind Garlic Oil’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
Garlic Oil's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 154 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
Garlic 154 references
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