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Holy basil (tulsi) review & buying guide

Updated October 2026 · How we review

Latin name: Ocimum tenuiflorumResearch strength: Limited

What it's been studied for

Stress and general well-being in traditional use; human research is limited.

What to look for

Capsules of leaf extract, or tulsi tea.

Plant part and extract ratio or standardization on the label
Amount per serving in milligrams
Third-party testing (USP Verified or NSF)
No claims to cure or treat disease

Cautions

May lower blood sugar and slow blood clotting. Usually avoided during pregnancy or when trying to conceive. Check with a doctor if you take diabetes or blood-thinning medicines.

For general supplement information, see the NIH Office of Dietary Supplements.

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Important: These statements have not been evaluated by the Food and Drug Administration. Products discussed are not intended to diagnose, treat, cure or prevent any disease. This site is for general information only and is not medical advice. Talk with your doctor or pharmacist before starting a supplement, especially if you are pregnant or breastfeeding, take medication, or have a health condition.