What kind of interaction is it?

Caution: an interaction that may reduce efficacy or raise side-effect risk and warrants monitoring.

Is this interaction backed by published research?

Yes. NutriStack lists 2 citation rows for the Garlic Extract + Nebivolol pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Prescription·a caution·Moderate evidence

Garlic Extract + Nebivolol

Q: Can I take Garlic Extract and Nebivolol together?

Possibly, but with caution. Garlic Extract and Nebivolol have a documented caution-tier interaction. Garlic extract has a modest antihypertensive effect, particularly aged garlic extract, and may add to the blood-pressure-lowering action of nebivolol. The combination is generally well tolerated but can occasionally produce additive hypotension.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

Caution Moderate evidence

Garlic extract has a modest antihypertensive effect, particularly aged garlic extract, and may add to the blood-pressure-lowering action of nebivolol. The combination is generally well tolerated but can occasionally produce additive hypotension.

Supplement × Prescription

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

Garlic Extract and Nebivolol

Pair type

Caution

Evidence

Moderate

Source citations

Scope

Supplement × Prescription

Last verified

June 4, 2026

CautionModerate evidence

What is happening. Garlic extract has a modest antihypertensive effect, particularly aged garlic extract, and may add to the blood-pressure-lowering action of nebivolol. The combination is generally well tolerated but can occasionally produce additive hypotension.

Mechanism. Garlic-derived organosulfur compounds enhance nitric-oxide-mediated vasodilation and reduce vascular resistance, an effect that can be additive with nebivolol's own nitric-oxide-mediated vasodilatory and beta-blocking actions.

Recommendation. The combination is acceptable and may be intentional for blood-pressure support. Monitor blood pressure when starting or increasing garlic extract, and report dizziness or lightheadedness. No dose separation is required.

Stack Score

How it moves the number.

Effect on the composite score

If both Garlic Extract and Nebivolol are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).

The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Ried K, Frank OR, Stocks NP, et al. Effect of garlic on blood pressure: a systematic review and meta-analysis. BMC Cardiovasc Disord. 2008.Needs sourceNo link
2Ried K. Garlic lowers blood pressure in hypertensive individuals, regulates serum cholesterol, and stimulates immunity: an updated meta-analysis and review. J Nutr. 2016.Needs sourceNo link

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