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 1 citation row for the Garlic Extract + Telmisartan 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 + Telmisartan

Q: Can I take Garlic Extract and Telmisartan together?

Possibly, but with caution. Garlic Extract and Telmisartan have a documented caution-tier interaction. Garlic extract has modest blood-pressure-lowering and vasodilatory effects. When combined with telmisartan, the antihypertensive effects can be additive, potentially producing excessive blood pressure reduction, dizziness, or symptomatic hypotension, especially at higher garlic doses or when telmisartan therapy is being titrated.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

Caution Moderate evidence

Garlic extract has modest blood-pressure-lowering and vasodilatory effects. When combined with telmisartan, the antihypertensive effects can be additive, potentially producing excessive blood pressure reduction, dizziness, or symptomatic hypotension, especially at higher garlic doses or when telmisartan therapy is being titrated.

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 Telmisartan

Pair type

Caution

Evidence

Moderate

Source citations

Scope

Supplement × Prescription

Last verified

June 4, 2026

CautionModerate evidence

What is happening. Garlic extract has modest blood-pressure-lowering and vasodilatory effects. When combined with telmisartan, the antihypertensive effects can be additive, potentially producing excessive blood pressure reduction, dizziness, or symptomatic hypotension, especially at higher garlic doses or when telmisartan therapy is being titrated.

Mechanism. Garlic-derived organosulfur compounds promote nitric-oxide-mediated vasodilation and may modestly inhibit ACE activity, adding to the antihypertensive effect of angiotensin receptor blockade.

Recommendation. If using garlic extract supplements alongside telmisartan, monitor blood pressure at home and watch for lightheadedness or fainting, particularly on standing. Tell your clinician so antihypertensive dosing can be adjusted if needed. Stop garlic supplements before surgery given additive effects and a theoretical bleeding risk.

Stack Score

How it moves the number.

Effect on the composite score

If both Garlic Extract and Telmisartan 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. Effect of garlic on blood pressure: a systematic review and meta-analysis. BMC Cardiovascular Disorders. 2008.Needs sourceNo link

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