# Nepalese Tulsi (Ocimum sanctum)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/nepalese-tulsi
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-01
**Evidence Score:** 2 / 10
**Category:** Adaptogen
**Also Known As:** Holy Basil, Sacred Basil, Tulsi, Krishna Tulsi, Ocimum tenuiflorum, Surasa, Manjari, Nepalese Holy Basil, Himalayan Tulsi, Ram Tulsi

## Overview

Nepalese Tulsi (Ocimum sanctum) is an aromatic herb whose primary bioactive compounds — eugenol, rosmarinic acid, and ursolic acid — drive its antioxidant and [anti-inflammatory](/ingredients/condition/inflammation) properties by scavenging [free radical](/ingredients/condition/antioxidant)s and inhibiting COX-2 and NF-κB pathways. It is classified as an [adaptogen](/ingredients/condition/stress) based on traditional Ayurvedic use and preliminary preclinical evidence suggesting modulation of cortisol and stress-response pathways.

## Health Benefits

• [Antioxidant](/ingredients/condition/antioxidant) support through phenolic compounds demonstrated in vitro (preliminary evidence only)
• Traditional use for respiratory conditions (historical evidence, no clinical trials found)
• Historically used for infections and [inflammation](/ingredients/condition/inflammation) (traditional evidence only)
• [Adaptogen](/ingredients/condition/stress)ic properties claimed in Ayurvedic medicine (traditional use, no clinical studies identified)
• Antibacterial activity shown in laboratory studies (preliminary in vitro evidence only)

## Mechanism of Action

Eugenol and ursolic acid in Ocimum sanctum inhibit cyclooxygenase-2 (COX-2) and suppress NF-κB transcription factor activation, reducing downstream [pro-inflammatory cytokine](/ingredients/condition/inflammation)s such as IL-6 and TNF-α. Rosmarinic acid and other phenolic compounds act as direct free-radical scavengers, donating hydrogen atoms to neutralize [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) and reducing oxidative stress markers in vitro. Adaptogenic effects are hypothesized to involve modulation of the [hypothalamic-pituitary-adrenal](/ingredients/condition/stress) (HPA) axis, potentially normalizing cortisol output under stress, though the precise receptor targets in humans remain under investigation.

## Clinical Summary

Most evidence supporting Nepalese Tulsi comes from in vitro cell studies and rodent models rather than rigorous human clinical trials, limiting the strength of any efficacy claims. One small open-label human study (n=24) examining a standardized Ocimum sanctum extract reported improvements in [cognitive](/ingredients/condition/cognitive) flexibility and stress scores over six weeks, but lacked a placebo control. Animal studies using doses of 100–400 mg/kg of aqueous leaf extract have demonstrated measurable reductions in [blood glucose](/ingredients/condition/weight-management) and [inflammatory](/ingredients/condition/inflammation) biomarkers, though translating these dosages to human equivalents is not straightforward. Overall, the evidence base is preliminary, and well-designed randomized controlled trials in humans are needed before firm clinical recommendations can be made.

## Nutritional Profile

Ocimum sanctum (Holy Basil / Tulsi) from Nepal is primarily consumed as a dried leaf tea or supplement rather than a caloric food source, so macronutrient contribution is negligible per typical serving (1–2 g dried leaf). Key bioactive compounds and micronutrients include: **Phenolic compounds & flavonoids:** Rosmarinic acid (approx. 1.0–4.0 mg/g dried leaf), eugenol (0.5–2.5% of essential oil fraction; total essential oil yield ~0.5–1.5% of dried herb), apigenin, luteolin, and orientin (collectively contributing to total flavonoid content of approximately 3–8 mg quercetin equivalents per g dried leaf). **Terpenoids:** Ursolic acid (~0.5–1.5 mg/g dried leaf), oleanolic acid (trace to ~0.3 mg/g). **Essential oil constituents:** Eugenol (40–70% of oil), β-caryophyllene (5–15%), methyl eugenol (1–10%), linalool (2–8%), with Nepalese chemotypes often showing higher eugenol dominance. **Vitamins (per 100 g fresh leaf, approximate):** Vitamin A (as β-carotene) ~2500–5000 IU, Vitamin C ~15–25 mg, Vitamin K ~400–450 µg, modest B-vitamins (folate ~30–40 µg). **Minerals (per 100 g fresh leaf, approximate):** Calcium ~175–200 mg, Iron ~3–4 mg, Magnesium ~30–55 mg, Potassium ~250–350 mg, Manganese ~1.1–1.5 mg, Zinc ~0.8–1.2 mg. **Fiber:** ~3–5 g per 100 g fresh leaf (mostly insoluble). **Protein:** ~3–4 g per 100 g fresh leaf. **Bioavailability notes:** Rosmarinic acid has moderate oral bioavailability (~15–25%) but undergoes rapid Phase II [metabolism](/ingredients/condition/weight-management) (glucuronidation/sulfation). Eugenol is well-absorbed orally but extensively first-pass metabolized; bioavailability is enhanced in warm aqueous infusions. Ursolic acid has poor water solubility and low oral bioavailability (~5–10%) unless taken with dietary fat. Fat-soluble vitamins (A, K) require co-ingestion with lipids for optimal absorption. Iron is non-heme form with ~5–12% absorption, improved by co-consumption with vitamin C. Brewing as a hot water infusion (traditional method) primarily extracts water-soluble phenolics (rosmarinic acid, flavonoid glycosides) while lipophilic terpenes and essential oil volatiles are partially lost.

## Dosage & Preparation

No clinically studied dosage ranges have been established for Nepalese Tulsi extracts, powders, or standardized forms. While studies quantify constituents like eugenol (20.9 g/100 g oil), therapeutic dosing protocols for human use have not been determined. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Nepalese Tulsi is generally considered well-tolerated at typical dietary and supplemental doses (300–600 mg dried leaf extract daily), with mild gastrointestinal discomfort reported in some users. Due to its potential blood-glucose-lowering effects via alpha-glucosidase inhibition, it may enhance the action of antidiabetic medications such as metformin or insulin, increasing hypoglycemia risk. Eugenol has antiplatelet properties, so concurrent use with anticoagulants like warfarin or NSAIDs warrants caution, and INR monitoring is advisable. Ocimum sanctum has demonstrated anti-fertility effects in animal models and is traditionally contraindicated during pregnancy; pregnant or breastfeeding individuals should avoid supplemental doses beyond culinary use.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses were found in the research dossier for Nepalese Tulsi cultivars. Available studies focus exclusively on phytochemical analysis and in vitro [antioxidant](/ingredients/condition/antioxidant)/antibacterial activities rather than human clinical evidence.

## Historical & Cultural Context

Ocimum sanctum, including Nepalese variants, has been used for centuries in Ayurvedic medicine for treating infections, [inflammation](/ingredients/condition/inflammation), respiratory issues, and as an [adaptogen](/ingredients/condition/stress). Historical applications span food, perfumery, oral care, and remedies for pathogenic diseases, particularly in low-socioeconomic populations.

## Synergistic Combinations

Ashwagandha, Rhodiola, Ginger, Turmeric, Black Pepper

## Frequently Asked Questions

### What is the difference between Nepalese Tulsi and regular Holy Basil?

Nepalese Tulsi is a regional variety of Ocimum sanctum grown at higher altitudes in Nepal, which may concentrate certain phenolic compounds like rosmarinic acid and eugenol differently compared to lowland varieties due to UV exposure and soil conditions. While botanically the same species, phytochemical profiles can vary meaningfully by cultivar and growing environment, potentially affecting potency. Most supplement labels use 'Holy Basil' broadly, so consumers should look for standardized extracts specifying eugenol or ursolic acid content.

### What is the recommended dosage of Nepalese Tulsi supplement?

Typical supplemental doses used in preliminary human studies range from 300 mg to 600 mg of standardized dried leaf extract per day, often divided into two doses with meals. Some adaptogen formulas use lower doses of 150–200 mg when combined with other herbs. There is no established official recommended daily allowance, and dosages above 1,000 mg/day have not been well-studied for long-term safety in humans.

### Can Nepalese Tulsi lower blood sugar levels?

Preclinical studies suggest Ocimum sanctum leaf extract can inhibit alpha-glucosidase and alpha-amylase enzymes, slowing carbohydrate digestion and blunting postprandial glucose spikes in rodent models at doses of 200–400 mg/kg. A small open-label human trial observed modest fasting blood glucose reductions in type 2 diabetic patients using 2.5 g of whole leaf powder daily. People taking antidiabetic medications should consult a healthcare provider before adding Tulsi supplements to avoid additive hypoglycemic effects.

### Does Nepalese Tulsi help with stress and anxiety?

Ocimum sanctum is categorized as an adaptogen based on its proposed ability to modulate the HPA axis and reduce circulating cortisol under stress conditions, effects observed in animal forced-swim and chronic-stress models. A pilot human study (n=35) reported significant reductions in self-reported anxiety and cognitive fatigue scores after 60 days of supplementation with 500 mg of standardized extract, though the trial lacked a placebo group. The active compounds ursolic acid and ocimumosides A and B are thought to be primarily responsible for this stress-modulating activity.

### Is Nepalese Tulsi safe to take during pregnancy?

Supplemental doses of Nepalese Tulsi are generally not recommended during pregnancy due to evidence from animal studies showing anti-fertility and uterotonic effects attributed to eugenol, which may stimulate uterine contractions at high concentrations. Traditional Ayurvedic texts also caution against medicinal use during pregnancy, though occasional culinary amounts are considered low-risk. Pregnant individuals should avoid standardized extracts or capsule doses and consult an obstetrician before use.

### Does Nepalese Tulsi interact with blood pressure or diabetes medications?

Nepalese Tulsi may have mild effects on blood glucose and blood pressure based on traditional use, which suggests potential interactions with antidiabetic and antihypertensive medications. If you take medications for diabetes, hypertension, or blood clotting, consult your healthcare provider before supplementing with Nepalese Tulsi to avoid additive effects. Clinical interaction studies are limited, so medical supervision is recommended when combining with prescription medications.

### What is the difference between Nepalese Tulsi extract and fresh or dried leaf forms?

Nepalese Tulsi extract is concentrated and standardized to specific phenolic compounds, potentially offering more consistent dosing than dried leaf, though bioavailability differences have not been clinically compared. Fresh leaf provides the full plant matrix but with variable potency depending on growing conditions and harvest timing. Dried leaf is a middle ground offering convenience while retaining most traditional compounds, though some volatile oils may be lost during drying.

### What does the scientific evidence show about Nepalese Tulsi's antioxidant and antibacterial claims?

In vitro (laboratory) studies have demonstrated phenolic compounds in Nepalese Tulsi with antioxidant properties, but these results have not been confirmed in human clinical trials. Antibacterial activity has been observed in test-tube studies, yet no clinical evidence supports effectiveness against infections in humans. The gap between preliminary laboratory findings and human efficacy remains significant, and consumers should view antioxidant and antimicrobial claims as preliminary rather than established.

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