Garlic
Also known as: Allium sativum, Aged garlic extract
Garlic is one of the most widely used food-based supplements, commonly discussed for cardiovascular wellness. Research suggests small effects on cholesterol and blood pressure in some groups, and little else is well established. The most practically important discussion is bleeding: garlic supplements may increase bleeding risk, which matters before procedures and alongside blood-thinning or antiplatelet medication.
Snapshot
What this page can tell you: NCCIH's note that garlic supplements may increase bleeding risk (surgery/anticoagulant context) and its common side effects.
What it cannot: That garlic treats or prevents heart disease or any condition — NCCIH describes benefits as small/mixed. Informational only.
🧩 Stack insights — how this fits into a schedule
Anticoagulants / antiplatelets; surgery — NCCIH: garlic supplements may increase the risk of bleeding, so tell your provider before surgery or if you take anticoagulants or aspirin. A review prompt, not a claim about your risk.
Bleeding / surgery caution category.
Relationship insights are informational only — they describe what is commonly discussed or studied, not what you should take. Not medical advice; review your routine with a clinician or pharmacist.
🕒 Timing
When: With a meal
Food: With food
Commonly taken with food to reduce stomach upset; timing is otherwise flexible.
💊 Common use range
600–1,200 mg
No established upper limit; products (powder, aged extract, oil) vary widely — follow product guidance.
Ranges are informational, not a recommended dose. Talk to a professional about what is right for you.
🤔 Worth considering?
Evidence vs. effort: Mixed evidence relative to burden
Cheap and familiar as a food; supplement effects on cholesterol and blood pressure are small. The main practical issue is bleeding risk — it is commonly flagged before surgery and alongside anticoagulants or aspirin, so it belongs on any list you share with your care team.
A general summary, not a recommendation. Whether something fits your situation is worth discussing with a healthcare professional.
⚠️ Commonly noted interactions (supplements)
None listed.
Often about absorption or timing rather than danger — separating doses is common. This list is not exhaustive.
🧭 Caution level
Ask a clinician or pharmacist before use.
- Bleeding / surgery caution category
- Pregnancy / breastfeeding caution
- Anticoagulant (blood thinner) interaction
- Antiplatelet interaction
Caution level is an informational summary of commonly discussed caution categories and doses — not a safety rating, approval, or medical advice. Low caution does not mean safe for you.
🩺 Medication caution categories
- Blood thinners (anticoagulants)
- Antiplatelet medication
- Pregnancy or nursing (health condition)
🏥 Surgery & procedure caution
Garlic supplements are commonly flagged for bleeding risk before surgery — tell your surgical team about them well before any scheduled procedure.
If you have a procedure scheduled, bring your full supplement list to your surgical and anesthesia team. Do not stop prescribed medication unless your clinician tells you to. Do not start or stop supplements based only on this app.
✅ Quality checklist
- Prefer products with third-party testing or a certificate of analysis (COA).
- Check the label for the exact form and the elemental or active amount per serving.
🧩 Commonly paired with
None listed.
🔁 Alternatives
🗣️ Questions for a professional
- I take a blood thinner or aspirin — is a garlic supplement safe to combine, and should I stop it before my procedure?
🛡️ Safety notes (source-reviewed)
- NCCIH: garlic supplements may increase the risk of bleeding — tell your provider before surgery or if you take anticoagulants or aspirin.
- Common side effects: breath/body odor, abdominal discomfort, gas, nausea.
- Oral garlic may be unsafe in pregnancy in amounts greater than food amounts.
⚖️ Evidence limitations
- NCCIH: effects on cholesterol and blood pressure are small; no disease treatment/prevention claim is made here.
❓ Frequently asked
Does garlic affect bleeding?
NCCIH notes garlic supplements may increase bleeding risk, which is why it is commonly flagged before surgery and with blood thinners or aspirin. Review with a clinician or pharmacist if that applies to you.
🔬 Evidence snapshot
Garlic supplements may produce small reductions in total and LDL cholesterol in people with high cholesterol and may reduce blood pressure to a small extent. Immune-support evidence is minimal, and garlic does not appear to reduce stomach-cancer risk.
🚦 Commonly noted cautions (auto)
Pregnancy / nursing caution category. This item carries a pregnancy/nursing caution category. If you are pregnant, nursing, or planning pregnancy, consider discussing it with a healthcare professional. This is a general caution, not a diagnosis or medical instruction.
🧪 Forms & quality
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
See the supplement glossary for what form names like "L-", chelated, or standardized extract mean.
📏 Dose & monitoring
Evidence vs. burden: Mixed evidence relative to burden
😐 Commonly reported side effects
- Breath and body odor
- Abdominal discomfort, gas, or nausea
- Allergic reactions in some people
Non-exhaustive and individual.
🔄 Cycling & breaks
No established cycling pattern.
📅 Daily use notes
If you take anticoagulants or aspirin, or have a procedure scheduled, discuss garlic supplements with a professional — they may increase bleeding risk. Amounts in normal cooking are a separate, food-level question.
📋 Source review status
Source-reviewed — last reviewed 2026-07-03
Reviewed against the NCCIH garlic page; editorial pass still pending.
Research backlog (queries to verify):
- garlic supplement LDL cholesterol meta-analysis
- garlic bleeding risk surgery anticoagulant case reports
📚 References
- NCCIH — GarlicNCCIH — Verified small cholesterol/blood-pressure effects, bleeding-risk caution (surgery, anticoagulants, aspirin), GI/odor side effects, and the pregnancy note about supplemental amounts.
Verified against the source shown. See the research-status page for how review works.
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