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For informational purposes only. Always consult a qualified medical professional before taking any supplement, herb, vitamin, mineral, or bioactive, especially if you use medications or have a medical condition. Read the full disclaimer.
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PromisingReviewed

Herbs & Botanicals

Garlic

Plants used as foods, spices, teas, or traditional supplements. Botanical effects vary by plant part, extract, dose, and medication context.

Page last reviewed: 2026-07-23 - next review due: 2027-01-23

culinaryWestern herbalismTCM

Safety Flags

blood thinners, bleeding risk, surgery, reflux, pregnancy/breastfeeding

Source Coverage

Included: US reference
Review gap: Canadian reference
Add or verify Health Canada context where an official Canadian reference exists.
Review gap: EU reference
Add or verify EFSA or EU health-claim context where an official EU reference exists.
Included: Clinical / safety source

Function

Allium food containing organosulfur compounds studied for cardiovascular and immune-related markers.

Natural Sources

Fresh garlic, roasted garlic, aged garlic preparations.

Food vs Supplement Context

Natural sources describe where this item appears in foods, culinary ingredients, or traditional preparations. Concentrated supplements can differ by dose, extract type, preparation, standardization, and medication context, so they should be evaluated separately.

Testing & Monitoring Context

  • No routine lab test establishes a required daily need for most foods and bioactives; monitoring is usually based on the intended outcome, dose, medical history, and adverse effects.
  • Blood thinner or bleeding-risk context: ask a clinician or pharmacist about INR/bleeding monitoring and surgery timing.

Suggested Guidelines When Purchasing

What to look for: For botanicals, plant part, extract ratio, standardization marker, preparation type, and medication cautions matter more than the herb name alone.

Use caution or avoid: Avoid casual use when these flags apply: blood thinners, bleeding risk, surgery, reflux, pregnancy/breastfeeding.

  • Prefer ordinary food sources first when they provide the intended compound in a practical way.
  • For supplements, require clear labeling of active ingredient, dose per serving, serving size, and other ingredients.
  • Prefer products with third-party testing or transparent contaminant testing, especially for concentrated extracts, algae, mushrooms, minerals, and sports products.
  • Do not let marketing claims override the evidence, safety flags, source coverage, or dose context on this page.

Intake Guidance

No official DRI

No official RDA, AI, or RDI has been established for this bioactive as a required daily intake.

Evidence Summary

Cholesterol, blood pressure, and glucose markers

Promising

NCCIH summarizes garlic supplement evidence as possibly showing small benefits for LDL or total cholesterol, blood pressure in people with high blood pressure, and blood sugar in people with diabetes, while disease-prevention claims are not established.

Dose context: Fresh garlic, aged garlic preparations, oils, powders, and capsules are not interchangeable.

Caution: Garlic supplements may increase bleeding risk and should be reviewed around anticoagulants, aspirin, surgery, pregnancy, and breastfeeding.

Studies/sources: Garlic: Usefulness and Safety (2026-07-26), Mixing Medications and Dietary Supplements Can Endanger Your Health (2026-07-23)

Evidence Legend

Established use: Supported by official guidance, regulatory claim context, strong consensus, or repeated human evidence for a specific use.
Promising: Human studies or reviews suggest benefit for specific outcomes, but evidence is not broad enough to treat as settled general guidance.
Emerging: Early human, mechanistic, or mixed evidence; worth tracking, but not strong enough for confident user-facing claims.
Traditional use: Historically or traditionally used, but modern clinical evidence may be limited, mixed, or product-specific.
Category example: Included to describe a supplement or food category, not because a strong health claim is attached yet.

Sources

FoodData Central

U.S. Department of Agriculture - acquired 2026-07-23 - Food Database