Holy Basil (Tulsi)

Also known as: Ocimum sanctum, Ocimum tenuiflorum, tulsi, sacred basil

Grade B — Moderate Evidenceherbadaptogen
300–600 mgWith meals. Consistent daily use for adaptogenic effects.

Holy Basil (Ocimum tenuiflorum), known as Tulsi in Ayurvedic tradition, is a potent adaptogen that modulates cortisol and supports the stress response through multiple pathways including COX-2 inhibition and antioxidant activity. Clinical trials show reductions in stress, anxiety, and depression scores, along with improvements in blood glucose and lipid profiles. It also demonstrates antimicrobial and immunomodulatory properties.

TL;DR: Ayurvedic adaptogen with evidence for stress reduction and blood glucose stabilization. Gentle daily-use herb.

🧘Stress & Anxiety🛡️Immunity
Last reviewed: 2026-03-12

Quick Facts

Evidence

Grade B

Studies

2

Interactions

3

Forms

1

Evidence Rating: Grade B — Moderate Evidence

Some RCTs with positive results, or strong observational evidence. More research may refine our understanding.

Cycling Protocol

8 weeks on/2 weeks off

Adaptogen cycling prevents tolerance and maintains stress-response modulation

Interaction Warnings

Antidiabetic medicationsModerate

Blood glucose lowering; may potentiate insulin or metformin

WarfarinLow

Mild antiplatelet/anticoagulant from eugenol; monitor at high doses

Thyroid medicationsLow

May interact with thyroid hormone metabolism

Important Notes

  • Avoid therapeutic doses in pregnancy (uterine stimulant)
  • May have anti-fertility effect (animal data)
  • Very safe at culinary doses

Clinical Evidence (2 studies)

Tulsi extract reduced stress and anxiety

Bhattacharyya D et al. (2008) — J Clin Diagn Res

Significantly reduced stress and anxiety in healthy adults; RCT

View on PubMed

Tulsi: comprehensive review of evidence

Cohen MM (2014) — J Ayurveda Integr Med

Comprehensive review of adaptogenic, cognitive, metabolic, and immunological evidence

View on PubMed

Alternatives to Consider

These supplements target similar goals and may be worth considering alongside or instead of Holy Basil (Tulsi).

Reishi

Grade B

Calming medicinal mushroom with immune-modulating and cancer-fatigue benefits. Best taken evening for sleep support.

🧘 Stress & Anxiety🛡️ Immunity

Ashwagandha

Grade A

Ayurvedic adaptogen with strong clinical evidence for cortisol reduction (15-30%), stress relief, and exercise performance.

🧘 Stress & Anxiety

Ginger

Grade A

Excellent evidence for anti-nausea effects (pregnancy, chemotherapy, post-op). Also anti-inflammatory with COX-2 inhibition.

🛡️ Immunity

Related Supplements

Reishi

Grade B — Moderate Evidence

Calming medicinal mushroom with immune-modulating and cancer-fatigue benefits. Best taken evening for sleep support.

Ashwagandha

Grade A — Strong Evidence

Ayurvedic adaptogen with strong clinical evidence for cortisol reduction (15-30%), stress relief, and exercise performance.

Rhodiola Rosea

Grade B — Moderate Evidence

Adaptogenic herb with strong evidence for reducing stress-related fatigue. Comparable to low-dose antidepressants for mild depression.

Schisandra

Grade B — Moderate Evidence

Adaptogen with liver-protective properties and military/Olympic athlete research for stress performance. CYP3A4 interactions are significant.

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⚕️ Important Disclaimer

This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.

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