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📰Read the full Garlic Extract evidence review on GMJ News →Complete clinical article, references and updates on news.gmj.ge. This page is the structured safety summary.⚠ Pre-surgical patient — stop garlic supplements 2 weeks before surgery (antiplatelet) [1]
⚠ Patient on anticoagulants — additive bleeding risk [1]
⚠ Patient on saquinavir (HIV) — garlic significantly reduces drug levels [1]
⚠ Fresh garlic tip: crush and wait 10 min before cooking [1]
ℹ️ Not obtained from food. Not applicable — this is not obtained from food in meaningful amounts; supplementation is the practical route.
🔬 Lab interpreter
Recommended test
Lipid panel
Lipid panel
Reference range / target
Per cardiovascular guidelines
Per cardiovascular guidelines
TC reduction ~17 mg/dL expected [2].
Full lab monitoring ↓⚕ For professionals — confirm ranges against your local laboratory.
Clinical verdict
Garlic is one of the best-evidenced herbal cardiovascular supplements — meta-analysis: TC −17 mg/dL, SBP −5 mmHg. Aged garlic extract (Kyolic) is the preferred form (standardized, odorless, best evidence). Fresh garlic: crush and wait 10 min before cooking. Antiplatelet effects — stop 2 weeks before surgery. Commission E and EMA approved for lipids [1] [2] [3].
1 How much do I need?
👤 Adults: Specific dosage data under clinical review
👴 Elderly: Specific dosage data under clinical review
🤰 Pregnancy: See guidance
Culinary garlic safe. Supplemental: antiplatelet concern near delivery [1].
👦 Pediatric: See guidance
Culinary garlic is safe. Supplemental extract data in children is limited [1].
🏃 Athletes: Standard dose
⚖️ Obesity: Standard dose
Fat-soluble compounds may require dose adjustment in obesity.
🩺 Renal: Consult specialist
Dose adjustment may be needed in renal impairment.
🌱 Vegan: Standard dose
How to take
🍽 Timing: With food to reduce GI upset [1].
💊 With food: With meals [1].
🚫 Avoid: 2 weeks before surgery (antiplatelet). Anticoagulants without monitoring [1].
2 Which form?
| Form | Bioavailability | Vegan | Cost |
|---|---|---|---|
| ['Aged garlic extract (AGE/Kyolic)', 'preferred', 'Aged 20+ months. Contains S-allylcysteine (SAC). Odorless. Most clinical evidence. Well-standardized [3].'] | Standard | Check label | |
| ['Garlic powder (allicin-standardized)', 'common', 'Contains alliin → converted to allicin by alliinase when dissolved. Must be enteric-coated to survive stomach acid [1].'] | Standard | Check label | |
| ['Garlic oil', '', 'Steam-distilled. Contains diallyl sulfides. Different chemical profile [1].'] | Standard | Check label | |
| ['Fresh garlic', '', '1–2 cloves/day. Contains allicin. Compliance limited by odor and GI effects [1].'] | Standard | Check label |
3 Common questions
Is aged garlic extract better than fresh garlic? ▼
For supplementation: yes. AGE (Kyolic) is standardized, odorless, and has the most clinical evidence [3]. Fresh garlic is effective but causes odor and GI issues. They contain different active compounds (AGE: S-allylcysteine; fresh: allicin).
Does cooking destroy garlic's benefits? ▼
Partially. Cooking destroys alliinase, preventing allicin formation. TIP: crush garlic and wait 10 minutes before cooking — this allows allicin to form first [1]. S-allylcysteine (the AGE compound) is heat-stable.
Can garlic lower blood pressure? ▼
Yes — meta-analysis shows ~5 mmHg SBP reduction in hypertensive individuals [2]. This is a meaningful effect, though not sufficient alone for moderate-severe hypertension.
Is garlic a blood thinner? ▼
Garlic has real antiplatelet effects. Ajoene and allicin inhibit platelet aggregation. Discontinue garlic supplements 2 weeks before surgery. Monitor with anticoagulants [1].
4 Clinical evidence
Strong
Cholesterol reduction: meta-analysis of 39 RCTs — TC −17 mg/dL with garlic supplementation [2]. Blood pressure: meta-analysis — SBP −5 mmHg (in hypertensive individuals) [2]. Allicin antimicrobial activity against bacteria, fungi, and viruses in vitro [1]. HIGH
Moderate
Arterial stiffness: AGE improved pulse wave velocity and coronary artery calcium progression in several trials [3]. Common cold: one RCT showed reduced cold incidence with AGE [1]. Antiplatelet: ajoene and allicin inhibit platelet aggregation [1]. MODERATE
Insufficient
5 Safety, toxicity & adverse events
Relative
⚠ Concurrent anticoagulants (warfarin) — garlic has antiplatelet effects; case reports of increased INR
⚠ Surgery — discontinue 7–10 days before (bleeding risk)
⚠ Concurrent saquinavir/HIV protease inhibitors — garlic induces CYP3A4, reducing saquinavir levels by 50%
⚠ Concurrent cyclosporine — CYP3A4 induction may reduce levels
🚩 Red flags
● Pre-surgical patient on garlic supplements — stop 2 weeks before [1]
● Patient on warfarin + garlic — monitor INR [1]
● HIV patient on saquinavir + garlic — drug level reduction [1]
6 Interactions
Drug interactions
Anticoagulants/antiplatelets Moderate
Mechanism: Ajoene and allicin inhibit platelet aggregation. [1]
Effect: Additive bleeding risk. [1]
Action: Monitor for bleeding. Discontinue 2 weeks before surgery [1].
Saquinavir Major
Mechanism: Garlic induces CYP3A4 and possibly P-glycoprotein, reducing saquinavir levels significantly. [1]
Effect: Subtherapeutic saquinavir levels; HIV treatment failure. [1]
Action: Avoid concurrent use [1].
CYP3A4 substrates (general) Moderate
Mechanism: Garlic may induce CYP3A4 metabolism. [1]
Effect: Potentially reduced drug levels. [1]
Action: Monitor drug efficacy if on narrow TI CYP3A4 drugs [1].
Supplement synergies
Omega-3 fatty acids · 1–2 g EPA+DHA
Complementary lipid-lowering and anti-inflammatory effects [1].
Complementary lipid-lowering and anti-inflammatory effects [1].
7 Regulatory
United States (FDA): GRAS as food. Dietary supplement [1].
Germany (Commission E): Approved for lipid elevation and atherosclerosis prevention [1].
European Union (EMA): 'Well-established use' for lipid management and atherosclerosis [1].
South Korea: Available as food and dietary supplement.
8 US supplement products
1
on-market products containing Garlic Extract (NIH DSLD)
Brands carrying Garlic Extract (1)
Click a brand to see its Garlic Extract products.
9 Frequently paired with
10 Cite this page
Vancouver: Pkhakadze G. Garlic Extract — safety profile [Internet]. Tbilisi: PHIG; 2026 [cited 2026 Aug 15]. Available from: https://supplement.ge/ingredients/garlic-extract/
APA 7th: Pkhakadze, G. (2026). Garlic Extract — Safety profile. Public Health Institute of Georgia. https://supplement.ge/ingredients/garlic-extract/
📋 Editorial information
Author: Prof. G. Pkhakadze, MD, MPH, PhD
Institution: Public Health Institute of Georgia (PHIG)
Affiliation: David Tvildiani Medical University (DTMU)
First published: January 2026
Last reviewed: 2026-05-29
Next review: February 2027
References: 3 cited sources
COI: SupplementIndex receives no funding from supplement manufacturers. All content independently authored by PHIG.
Process: Systematic literature review
📄 License & reuse
Published under Creative Commons Attribution 4.0 International (CC BY 4.0). You may share and adapt for any purpose with attribution.
Pkhakadze G. "Garlic Extract — Safety Profile." SupplementIndex, PHIG, 2026. https://supplement.ge/ingredients/garlic-extract/ CC BY 4.0.
GP
Prof. G. Pkhakadze, MD, MPH, PhD
Professor of Public Health · Head of Department, DTMU
Editor-in-Chief, Georgian Medical Journal (ISSN 3088-4322)
Chair, Public Health Institute of Georgia · UEMS Public Health Section
Educational and public health purposes. CC BY 4.0. Consult your healthcare provider before starting any supplement. Corrections: info@accreditation.ge. Publisher: PHIG