Sacred basil
StarOcimum tenuiflorum
Synonyms: Ocimum scutellarioides, Ocimum monachorum, Plectranthus monachorum, Ocimum hirsutum, Ocimum inodorum, Moschosma tenuiflorum, Ocimum tenuiflorum f. villicaulis, Ocimum sanctum, Ocimum sanctum var. hirsutum, Ocimum villosum, Ocimum subserratum, Ocimum sanctum var. cubensis, Geniosporum tenuiflorum, Lumnitzera tenuiflora, Ocimum flexuosum, Ocimum tomentosum
Western Herbalism Properties
Traditional Uses
Tulsi is among the most revered herbs of Ayurveda, classified as a rasayana (rejuvenative/adaptogenic tonic) and used for promoting resilience to physical, chemical, metabolic and psychological stress. Traditional Ayurvedic and broader South and Southeast Asian folk practice employs the leaves and whole plant for respiratory complaints (coughs, colds, bronchitis, asthma), fevers, digestive upset, and to support immunity and general vitality; the seeds are also used (Cohen, 2014; Warrier et al., 1995). Modern pharmacological review supports its classification as an adaptogen.
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Botanical Description
Ocimum tenuiflorum (synonym O. sanctum; holy basil or tulsi) is an aromatic, erect, much-branched subshrub or perennial herb of the Lamiaceae, 30–60 cm tall, with hairy quadrangular stems and ovate, often purplish, toothed leaves bearing a strong clove-like scent. Small purplish to white flowers are borne in elongated terminal racemes of whorled verticillasters, followed by tiny nutlets. Native to the Indian subcontinent and widely cultivated across tropical Asia, it is grown around homes and temples.
Active Constituents
Eugenol
Phenylpropanoid (volatile phenol)Concentration: Major constituent of leaf essential oil, commonly 40-70% of the oil
The principal aromatic and bioactive component of tulsi leaf oil, responsible for the clove-like scent. Eugenol has documented anti-inflammatory, antioxidant, analgesic and antimicrobial activity, inhibits COX-mediated prostaglandin synthesis, and contributes to the herb's reputed gastroprotective and hypoglycaemic effects.
Rosmarinic acid
Phenolic acid (caffeic acid ester)Concentration: Abundant water-soluble phenolic of leaves and aerial parts
A potent antioxidant and free-radical scavenger with anti-inflammatory and immunomodulatory activity. Contributes to the antioxidant capacity of tulsi aqueous extracts and infusions.
Ursolic acid
Pentacyclic triterpenoidConcentration: Present in leaf; a characteristic triterpene marker
Investigated for anti-inflammatory, anti-hyperlipidaemic, hepatoprotective and chemopreventive activity in preclinical models. Contributes to lipid-lowering effects reported for tulsi.
Ocimumosides A and B
Cerebroside / phenolic glycosidesConcentration: Minor constituents isolated from leaves
Identified as anti-stress principles that normalise stress-induced changes in corticosterone and neurotransmitter levels in animal models, supporting tulsi's traditional use as an adaptogen.
beta-Caryophyllene
SesquiterpeneConcentration: Notable component of the essential oil
A dietary CB2 cannabinoid-receptor agonist with anti-inflammatory and gastroprotective activity; contributes to the aroma and pharmacology of the volatile oil.
Apigenin and luteolin
FlavonesConcentration: Minor flavonoid constituents of leaves
Antioxidant and anti-inflammatory flavonoids that contribute to radical-scavenging and enzyme-modulating activity of tulsi extracts.
Methyl eugenol
PhenylpropanoidConcentration: Variable minor-to-moderate fraction of leaf oil (chemotype dependent)
Contributes to aroma and antimicrobial activity; of toxicological note because methyl eugenol is a rodent hepatocarcinogen at high exposures, so intake from concentrated oils should be moderate.
⚠ Drug Interactions
Antidiabetic drugs (insulin, metformin, sulfonylureas)
Tulsi lowers fasting and post-prandial blood glucose in human trials; combined with pharmacological hypoglycaemic agents this additive effect could precipitate hypoglycaemia.
Clinical note: Monitor blood glucose when tulsi is used alongside antidiabetic therapy; dose adjustment may be needed.
Anticoagulant and antiplatelet agents (warfarin, aspirin, clopidogrel)
Eugenol inhibits platelet aggregation in vitro, so concurrent use with drugs affecting haemostasis may theoretically increase bleeding tendency.
Clinical note: Use cautiously with anticoagulants/antiplatelets and around surgery; watch for bruising or bleeding.
CNS depressants / sedatives (pentobarbital, benzodiazepines)
Animal studies show tulsi extracts can potentiate barbiturate-induced sleeping time, suggesting a theoretical additive CNS-depressant effect.
Clinical note: Be aware of possible enhanced drowsiness if combined with sedatives.
Preparation Methods
Herbal infusion (tea)
Parts: leaf, aerial parts
Steep about 1-2 teaspoons of fresh or dried leaves in a cup of just-boiled water, covered, for 5-10 minutes; taken 1-3 times daily as a daily wellness and adaptogenic tonic.
Leaf powder
Parts: leaf
Dried leaf powdered and taken in roughly 1-2.5 g daily doses (as used in metabolic trials), mixed with water, honey or food.
Fresh leaf / chewed leaves
Parts: leaf
A few fresh leaves chewed or added to food in traditional Ayurvedic practice; also expressed juice used for respiratory and digestive complaints.
Tincture / hydroalcoholic extract
Parts: leaf, aerial parts
Alcohol-water extract of aerial parts used for standardized dosing. Avoid concentrated essential oil internally in pregnancy; the oil is rich in eugenol/methyl eugenol and should not be used undiluted.
Clinical Studies
The Clinical Efficacy and Safety of Tulsi in Humans: A Systematic Review of the Literature
Review of 24 human studies found tulsi produced favourable clinical effects on metabolic parameters (blood glucose, lipids, blood pressure), immunity and neurocognition, with no significant adverse events reported across trials.
Holy basil (tulsi) lowers fasting glucose and improves lipid profile in adults with metabolic disease: A meta-analysis of randomized clinical trials
Pooled analysis of randomized trials showed tulsi significantly reduced mean fasting blood glucose and, in older patients at higher doses, lowered total, LDL and VLDL cholesterol in adults with metabolic disease.
A randomized, double-blind, placebo-controlled trial investigating the effects of an Ocimum tenuiflorum (Holy Basil) extract (Holixer) on stress, mood, and sleep in adults experiencing stress
An O. tenuiflorum extract improved self-reported stress, mood and sleep outcomes versus placebo in stressed adults over 8 weeks, supporting adaptogenic and anxiolytic uses of tulsi.
Effect of Tulsi (Ocimum sanctum Linn.) Supplementation on Metabolic Parameters and Liver Enzymes in Young Overweight and Obese Subjects
Tulsi supplementation in overweight/obese subjects improved BMI, plasma lipids and insulin sensitivity and was well tolerated, providing controlled human evidence for metabolic benefits.
Historical Texts
Charaka Samhita and Sushruta Samhita
Classical Ayurvedic era (c. 1st millennium BCE - early CE)Puranas and Hindu devotional literature
Ancient to medieval IndiaReferences
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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