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📰Read the full Holy Basil (Tulsi) evidence review on GMJ News →Complete clinical article, references and updates on news.gmj.ge. This page is the structured safety summary.⚠ Patient trying to conceive using daily Tulsi — animal anti-fertility effects; disclose [1]
⚠ Patient on warfarin using Tulsi — eugenol has antiplatelet activity [1]
⚠ Patient on metformin starting Tulsi — additive glucose lowering; monitor [2]
⚠ Patient confusing Tulsi with sweet basil — different species, different effects [1]
🥗 Food first — build your daily Typical 300–600 mg
Check the foods you regularly eat — the bar fills toward your daily target.
Fresh Tulsi leaves (10 leaves)30 mg total phenolics (approximate)
Tulsi tea (1 cup)20 mg total phenolics (approximate)
Tulsi pesto (1 tbsp)15 mg total phenolics (approximate)
Check your regular foods above
🔬 Lab interpreter
Recommended test
No routine monitoring required
No routine monitoring required
Reference range / target
N/A
N/A
When to test
N/A
N/A
Monitor glucose if diabetic [2].
Full lab monitoring ↓⚕ For professionals — confirm ranges against your local laboratory.
Clinical verdict
Tulsi is a genuine broad-spectrum adaptogen with RCT support for stress reduction, glucose lowering, and cognitive improvement — though individual study quality is moderate. The critical safety teaching: animal anti-fertility effects are consistent and should be communicated to patients of reproductive age. Three chemotypes (Krishna/Rama/Vana) have different profiles; commercial products rarely specify which [1] [2].
1 How much do I need?
👤 Adults: Specific dosage data under clinical review
👴 Elderly: Specific dosage data under clinical review
🤰 Pregnancy: See guidance
Avoid in pregnancy and when trying to conceive. Animal studies show anti-implantation and anti-estrogenic effects [1].
👦 Pediatric: See guidance
Tulsi tea is traditionally given to children in India for colds and fever. No formal pediatric dosing for concentrated extracts [1].
🏃 Athletes: Standard dose
⚖️ Obesity: Standard dose
Fat-soluble compounds may require dose adjustment in obesity.
🩺 Renal: Consult specialist
Dose adjustment may be needed in renal impairment.
🌱 Vegan: Standard dose
How to take
🍽 Timing: BID, morning and evening. Tea: 2–3 cups/day. Fresh leaves: on empty stomach [1].
💊 With food: Extract with food. Tea on its own. Fresh leaves on empty stomach (traditional) [1].
🚫 Avoid: Use during pregnancy or fertility attempts. Combining with anticoagulants without monitoring. Large doses before surgery [1].
2 Which form?
| Form | Bioavailability | Vegan | Cost |
|---|---|---|---|
| ['Tulsi leaf extract (standardized)', 'preferred', 'Standardized to eugenol or ursolic acid content. 300–600 mg BID [1].'] | Standard | Check label | |
| ['Tulsi tea (dried leaf)', 'popular', '2–3 cups/day. Widely consumed in India. Mild effect compared with extracts [1].'] | Standard | Check label | |
| ['Tulsi powder (whole leaf)', 'traditional', '1–3 g/day in warm water or honey. Traditional Ayurvedic preparation [1].'] | Standard | Check label | |
| ['Fresh Tulsi leaves', 'culinary', 'Chewed fresh (traditional) or added to food. 5–10 leaves/day [1].'] | Standard | Check label |
3 Common questions
Is Tulsi the same as sweet basil? ▼
No. Tulsi (Ocimum tenuiflorum) and sweet basil (O. basilicum) are different species. Tulsi has a more peppery, clove-like taste (eugenol) and is used medicinally. Sweet basil is the culinary herb in Italian cuisine. Their phytochemical profiles and clinical effects are different [1].
Can Tulsi affect fertility? ▼
Animal studies consistently show anti-fertility effects — reduced sperm count in males and anti-implantation effects in females. While human fertility data are lacking, the preclinical signal is strong enough to recommend avoidance when trying to conceive [1].
How does Tulsi compare with Ashwagandha as an adaptogen? ▼
Is Tulsi safe long-term? ▼
Traditional use spans thousands of years with an excellent safety profile. However, long-term clinical trial data (>12 weeks) are limited. The main concern is the anti-fertility effect — avoid in reproductive-age individuals trying to conceive [1].
4 Clinical evidence
Strong
No single endpoint has Cochrane-level evidence. The breadth of moderate evidence across multiple endpoints is the notable feature [2]. HIGH
Moderate
Stress/anxiety: 2 RCTs (total n=135) found Tulsi extract (300–600 mg BID) significantly reduced stress scores (PSS), anxiety (HAM-A), and improved sleep quality vs placebo over 6–8 weeks [2]. Blood glucose: a meta-analysis of studies found significant FBG reduction; one RCT (n=60) showed 250 mg leaf extract BID reduced FBG by 17.6% in T2DM patients over 4 weeks [2]. Lipids: modest TC and LDL reduction in 2 small RCTs [2]. Cognition: 1 RCT (n=40) showed improved reaction time and attention with 300 mg/day × 4 weeks [2]. MODERATE
Insufficient
Cancer prevention: extensive preclinical data (COX-2/LOX inhibition, NF-κB modulation); no human trials [1]. Immunomodulation: animal data showing enhanced immune response; human evidence limited to open-label studies [1]. Radiation protection: preclinical only [1]. Hepatoprotection: animal models show benefit; no RCTs [1]. LOW
5 Safety, toxicity & adverse events
Relative
⚠ Anticoagulants/antiplatelets — possible additive effect
⚠ Antidiabetics — additive glucose lowering
⚠ May reduce fertility (animal data) — caution if trying to conceive
⚠ Pregnancy — avoid
⚠ Discontinue before surgery
🚩 Red flags
● Reproductive-age patient using Tulsi daily and trying to conceive — disclose anti-fertility data [1]
● Diabetic patient on sulfonylurea reporting dizziness after starting Tulsi — check glucose [2]
● Patient scheduled for surgery still taking Tulsi — discontinue 2 weeks before due to antiplatelet effects [1]
6 Interactions
Drug interactions
Anticoagulants/antiplatelets Moderate
Mechanism: Eugenol inhibits platelet aggregation [1].
Effect: Additive bleeding risk [1].
Action: Monitor INR if on warfarin. Discontinue 2 weeks before surgery [1].
Antidiabetics Moderate
Mechanism: Tulsi reduces FBG independently [2].
Effect: Additive hypoglycemia [2].
Action: Monitor blood glucose more frequently [2].
Supplement synergies
Ashwagandha · 300 mg each, standardized extracts
Classic Ayurvedic adaptogen combination. Complementary HPA axis modulation [1].
Classic Ayurvedic adaptogen combination. Complementary HPA axis modulation [1].
Turmeric / Curcumin · Standard doses of each
Synergistic anti-inflammatory: Tulsi (COX-2/eugenol) + Curcumin (NF-κB) [1].
Synergistic anti-inflammatory: Tulsi (COX-2/eugenol) + Curcumin (NF-κB) [1].
7 Regulatory
India (Ayush): Classified as a traditional Ayurvedic medicine. Listed in the Ayurvedic Pharmacopoeia of India [1].
United States (FDA): Available as dietary supplement. GRAS for food use. No FDA-approved health claims [1].
European Union: Available as food supplement and herbal tea [1].
8 Cite this page
Vancouver: Pkhakadze G. Holy Basil (Tulsi) — safety profile [Internet]. Tbilisi: PHIG; 2026 [cited 2026 Aug 15]. Available from: https://supplement.ge/ingredients/holy-basil-tulsi/
APA 7th: Pkhakadze, G. (2026). Holy Basil (Tulsi) — Safety profile. Public Health Institute of Georgia. https://supplement.ge/ingredients/holy-basil-tulsi/
📋 Editorial information
Author: Prof. G. Pkhakadze, MD, MPH, PhD
Institution: Public Health Institute of Georgia (PHIG)
Affiliation: David Tvildiani Medical University (DTMU)
First published: January 2026
Last reviewed: 2026-05-29
Next review: February 2027
References: 4 cited sources
COI: SupplementIndex receives no funding from supplement manufacturers. All content independently authored by PHIG.
Process: Systematic literature review
📄 License & reuse
Published under Creative Commons Attribution 4.0 International (CC BY 4.0). You may share and adapt for any purpose with attribution.
Pkhakadze G. "Holy Basil (Tulsi) — Safety Profile." SupplementIndex, PHIG, 2026. https://supplement.ge/ingredients/holy-basil-tulsi/ CC BY 4.0.
GP
Prof. G. Pkhakadze, MD, MPH, PhD
Professor of Public Health · Head of Department, DTMU
Editor-in-Chief, Georgian Medical Journal (ISSN 3088-4322)
Chair, Public Health Institute of Georgia · UEMS Public Health Section
Educational and public health purposes. CC BY 4.0. Consult your healthcare provider before starting any supplement. Corrections: info@accreditation.ge. Publisher: PHIG