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Garlic extract

Also known as: aged garlic extract, AGE, allicin, Allium sativum

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Garlic extract is taken mainly for heart health — the best-supported benefit is a modest reduction in blood pressure. Aged garlic extract is the most studied and best-tolerated form.

What it is

Concentrated Allium sativum. Its activity comes from organosulfur compounds — allicin (formed when garlic is crushed) and stable derivatives like S-allylcysteine. Aged garlic extract (AGE) has more stable active compounds than powders or oils. Proposed mechanisms include increased nitric oxide, improved endothelial function, and antioxidant effects.1

Commonly used for

Blood pressure: the strongest evidence — meta-analyses show systolic reductions of ~5–8 mmHg and diastolic ~2.5–5.5 mmHg, especially in hypertensives; AGE has performed comparably to first-line medications in some trials.23

Cholesterol: modest, inconsistent reductions in total/LDL cholesterol across studies.13

Typical dosing

Commonly ~600–2,400 mg/day, often standardized to allicin content (~1.1–1.3%). Enteric-coated products help allicin survive stomach acid. Aged garlic extract has been used at 2.4–7.2 g/day in studies.3

Route of administration

Oral, as capsules or tablets (powder, oil, or aged garlic extract), often enteric-coated.

Storage & handling

Store at room temperature, away from heat, light, and moisture.

Common considerations

May lower blood pressure (caution if on BP meds — monitor) and has mild blood-thinning effects (caution with anticoagulants and before surgery). Can cause breath/body odor, GI upset. May reduce effectiveness of certain drugs (e.g. sofosbuvir).

References

  1. 1. Linus Pauling Institute, Oregon State University — Garlic (Micronutrient Information Center) Fact sheet
  2. 2. Garlic and Hypertension: Efficacy, Mechanism of Action, and Clinical Implications (Nutrients, 2024) Review
  3. 3. Merck Manual (Consumer Version) — Garlic Fact sheet

The information on this page is provided for general educational purposes only. It is not medical advice and is not a substitute for consultation with a qualified healthcare provider. Individual needs, contraindications, and responses to supplementation vary, and decisions about starting, stopping, or modifying any supplement or medication should be made in consultation with a physician, pharmacist, or other appropriate professional. References are provided to authoritative sources; STACK Tracker does not endorse any specific product or brand.