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Garlic for Blood Pressure: What the Meta-Analyses Show

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Meta-analyses find garlic supplements were associated with modest reductions in blood pressure — on the order of about...

Meta-analyses find garlic supplements were associated with modest reductions in blood pressure — on the order of about 5 mmHg systolic overall, and larger (around 8 mmHg systolic) in people with hypertension. Garlic may be a supportive option alongside diet and lifestyle, but it is not a replacement for prescribed blood-pressure medication.

Key Findings

  • An updated meta-analysis (20 trials, 970 participants) found garlic supplementation was associated with a meaningful reduction in systolic and diastolic blood pressure versus control.
  • Reductions were larger in people who were hypertensive at baseline (roughly 8 mmHg systolic) than in those with normal blood pressure.
  • Aged garlic extract and standardized garlic powder were the commonly studied preparations.
  • Mild side effects (such as breath odor, burping, or reflux) were reported by roughly a third of participants, but were generally minor.

Study Details

Garlic Lowers Blood Pressure in Hypertensive Individuals, Regulates Serum Cholesterol, and Stimulates Immunity: An Updated Meta-analysis and Review
Ried K — The Journal of Nutrition (2016)
Garlic supplementation (20 trials, 970 participants) was associated with reduced systolic and diastolic blood pressure, with larger effects in hypertensive participants.
970 participantsModerate

Practical Takeaway

Garlic supplements have been studied for supporting healthy blood pressure, with meta-analyses showing modest reductions — most notably in people with hypertension. Studied preparations included aged garlic extract and standardized garlic powder, commonly around 600–1,200 mg/day. Garlic can mildly thin the blood, so check with a clinician if you take anticoagulants, and never use it to replace prescribed blood-pressure medication. This is supportive information; blood pressure should be monitored and managed with your healthcare provider.

Summary

Meta-analyses report that garlic supplements were associated with modest reductions in blood pressure, with larger effects in people who have hypertension.

Related Supplements

Garlic

Related Conditions

Immune Function

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Frequently Asked Questions

Does garlic lower blood pressure?

Meta-analyses found garlic supplements were associated with modest reductions in blood pressure — about 5 mmHg systolic on average, and more in people with hypertension. It is a supportive option, not a substitute for prescribed treatment.

What kind of garlic and how much was studied?

Trials commonly used aged garlic extract or standardized garlic powder, often around 600–1,200 mg/day. Aged garlic extract is among the better-studied forms for blood pressure.

Can I take garlic with blood-pressure medication?

Talk to your clinician first. Garlic can mildly thin the blood and may add to the effects of some medications. It should complement, not replace, prescribed blood-pressure treatment, and your blood pressure should still be monitored.

Are there side effects to garlic supplements?

The most common effects are breath or body odor, burping, and occasional reflux, reported by roughly a third of users and generally mild. People on blood thinners or due for surgery should check with a clinician.

Continue Reading

Supplement Guide

Garlic

Bottom line: Garlic is a proven immune booster with antimicrobial and immune-enhancing effects. Aged garlic extract is best for daily use; raw garlic for maximum allicin antimicrobial activity.

Condition Guide

Immune Function

References

  1. Ried K (2016). Garlic Lowers Blood Pressure in Hypertensive Individuals, Regulates Serum Cholesterol, and Stimulates Immunity: An Updated Meta-analysis and Review. The Journal of Nutrition. DOI PubMed
  2. Ried K, Frank OR, Stocks NP, Fakler P, Sullivan T (2008). Effect of garlic on blood pressure: a systematic review and meta-analysis. BMC Cardiovascular Disorders. DOI PubMed