Supaveda · Ingredient Spotlight
Tulsi
Ocimum tenuiflorum L. — Holy Basil
Also known as: Ocimum sanctum · Vrinda · Vishnu Priya · Surasa · Bhutaghni · Sacred Basil · The Elixir of Life
Of all the herbs used in Ayurveda — and there are thousands — none occupies a position quite like Tulsi. It is simultaneously the most sacred plant in Hindu tradition, the most widely consumed medicinal herb in India, and the subject of more peer-reviewed human clinical studies than almost any other Ayurvedic herb. In Ayurveda it is called "the Elixir of Life." In science it is called one of the most comprehensively studied adaptogens in existence.
A perennial aromatic shrub found growing in virtually every Indian household courtyard, temple garden, and village square, Ocimum tenuiflorum has been described in Ayurvedic texts since the Rigveda — India's oldest sacred text, composed approximately 3,500 years ago. The 2017 PMC systematic review by Jamshidi and Cohen synthesised 24 human clinical studies, concluding that Tulsi demonstrates "therapeutic actions including adaptogenic, antimicrobial, anti-inflammatory, cardioprotective, and immunomodulatory effects" — a breadth of validated properties matched by almost no other single plant. 1 A 2022 double-blind, placebo-controlled RCT published in Frontiers in Nutrition confirmed improvements in stress (p=0.003), sleep quality (p=0.025), and hair cortisol (p=0.025) over 8 weeks — the most rigorous clinical trial on Tulsi's adaptogenic properties to date. 2
⚠ Pregnancy — Use with Caution
Tulsi has traditional classification as an anti-fertility and emmenagogue herb — animal studies have confirmed anti-implantation and abortifacient effects at high doses. At culinary food amounts, Tulsi is widely consumed during pregnancy in India without apparent harm. Therapeutic doses (500 mg+ extract supplements) should be avoided during pregnancy and while trying to conceive. Breastfeeding mothers should consult a healthcare provider. See Safety section for full detail. 3
Sacred Identity — The Incomparable One
The Sanskrit name Tulsi means "the incomparable one." Vishnu Priya — "beloved of Vishnu" — reflects the plant's supreme status in Hindu tradition, where it is considered the most sacred of all plants, grown in the courtyard of virtually every observant Hindu household as both a spiritual offering and a living pharmacy. Surasa — "of excellent essence" — describes its aroma. Bhutaghni — "destroyer of demons" — describes its antimicrobial and purifying properties. 4
This spiritual centrality is not incidental to its medical significance — it is the reason Tulsi has been continuously observed, cultivated, and studied for 3,500 years. No other plant in Ayurveda has been grown in as many homes, consumed by as many people daily, or observed across as many conditions and generations. The accumulated clinical wisdom encoded in Ayurvedic texts about Tulsi represents perhaps the largest and longest-running observational medical dataset in human history. Modern science has spent the last century attempting to catch up with what Indian physicians observed over three and a half millennia. 4
At a Glance — Key Evidence-Backed Benefits
The Three Varieties — Rama, Krishna & Vana
Tulsi is not a single uniform plant — three botanically distinct varieties are recognised in Ayurveda and confirmed by modern phytochemistry, each with a different appearance, aroma profile, and therapeutic emphasis. Understanding which variety is being used is important for interpreting both traditional prescriptions and modern research. 4
- Higher eugenol content — strongest anti-inflammatory and antimicrobial
- Primary clinical trial variety in most human studies
- Best for daily teas, tinctures, and general adaptogenic use
- Most widely available and cultivated
- Higher anthocyanin content — more potent antioxidant
- Preferred for respiratory and throat conditions classically
- Stronger pungent flavour and aroma
- Rich in clove-like compounds — strong antimicrobial profile
- Highest thymol content — potent antimicrobial action
- Strongest diaphoretic (fever-reducing) action
- Used for more severe infections and fevers classically
- Less available commercially; primarily wild-harvested
Traditional Ayurvedic Uses
In the Charaka Samhita, Tulsi is classified in the Surasadi group and described as Kaphavataghna (destroyer of Kapha and Vata excess), Deepana (digestive fire-stimulating), and Vishaghna (antidote to poisons). It is described as acting on virtually every major physiological system — a breadth of application that would seem implausible for a single plant if not supported by the PMC systematic review confirming exactly this across 24 human studies. 1
The comprehensive 2014 PMC review by Cohen — titled "Tulsi - Ocimum sanctum: a herb for all reasons" — catalogued over twenty distinct pharmacological properties confirmed by scientific research, including: antimicrobial, antioxidant, anti-inflammatory, chemopreventive, radioprotective, liver-protective, neuroprotective, cardioprotective, antidiabetic, anti-hypercholesterolaemia, anti-hypertensive, analgesic, antipyretic, anti-allergic, immunomodulatory, memory enhancement, anti-asthmatic, and adaptogenic. 4
Ayurvedic Properties (Guna)
Conditions Traditionally Treated
- Respiratory conditions — cough, cold, bronchitis, asthma; the foremost Ayurvedic respiratory herb
- Fever (Jwara) — diaphoretic; reduces fever by promoting perspiration and eliminating toxins
- Stress and anxiety — classified as an adaptogen (Rasayana); calms the nervous system
- Digestive disorders — flatulence, diarrhoea, and intestinal infections
- Skin conditions — acne, infections, eczema; topical antimicrobial and anti-inflammatory
- Dental health — dental caries, gum disease, mouth ulcers; oral antimicrobial
- Ear infections — fresh leaf juice traditionally applied for earache
- Eye disorders — anti-inflammatory and antimicrobial properties applied topically
- Snake and insect bites — classified Vishaghna (antidote to poison)
- Cardiac disorders — heart tonic properties; reduces blood pressure and cholesterol
Key Active Compounds
Tulsi's extraordinary breadth of pharmacological activity arises from an unusually rich and diverse phytochemical profile — with eugenol dominating the volatile oil (up to 72%), alongside a suite of terpenoids, flavonoids, phenolic acids, and unique chromone compounds. The 2022 bibliometric review confirmed that five primary thematic clusters dominate current research: traditional medicine, phytochemistry, pharmacology, nanotechnology, and dermatology — reflecting the herb's expanding modern applications. 5
Primary Bioactive Constituents
Tulsi as an Adaptogen — How It Addresses Modern Stress
The designation of Tulsi as an adaptogen — a substance that non-specifically increases resistance to stress and promotes homeostasis — is the classification most supported by modern human clinical evidence. The PMC review (Cohen, 2014) described Tulsi as possessing a "unique combination of pharmacological actions that fulfil the definition of an adaptogen." 4 These are the four independent mechanisms through which it achieves this:
Tulsi's Four Adaptogenic Mechanisms
What the Research Says
The most rigorous clinical evidence for Tulsi's adaptogenic effects comes from the double-blind, placebo-controlled RCT by Lopresti et al. (2022), published in Frontiers in Nutrition (PMC9524226). One hundred volunteers aged 18–65 received either 125 mg of standardised O. tenuiflorum extract (HolixerTM) twice daily or placebo for 8 weeks. Compared to placebo, the Tulsi group showed significantly greater improvements in Perceived Stress Scale (PSS, p=0.003), Athens Insomnia Scale (AIS, p=0.025), and hair cortisol concentrations (p=0.025). 2 The hair cortisol finding is particularly important — unlike blood cortisol (which fluctuates dramatically hour to hour), hair cortisol represents cumulative cortisol exposure over 8 weeks, providing objective physiological evidence of genuinely reduced chronic stress hormone burden rather than merely subjective reported improvement. The study also found improvements in mood and sleep as secondary outcomes. The extract used (HolixerTM) had been specifically characterised for its HPA axis effects in a separate mechanistic study.
A double-blind, placebo-controlled RCT by Mondal et al. (2011) published in the Journal of Ethnopharmacology specifically evaluated Tulsi's immunomodulatory effects in 24 healthy volunteers. Participants received 300 mg/day of O. sanctum leaf extract for 4 weeks. The treatment group showed significantly enhanced immune function: increased IFN-γ (interferon-gamma, a key anti-viral cytokine), increased NK (natural killer) cell activity, increased total T-cell counts, and improved Th1/Th2 cytokine balance — all statistically significant compared to placebo. 6 The combination of IFN-γ elevation, NK cell activation, and T-helper cell enhancement suggests Tulsi stimulates both innate and adaptive immunity through complementary pathways. The systematic review (Jamshidi and Cohen, 2017) classified this as one of the highest-quality clinical trials in the Tulsi literature. 1
A meta-analysis by Jamshidi and Cohen (2017, cited in the systematic review, PMC5376420) pooled randomised clinical trials evaluating Tulsi's effects on metabolic parameters. The analysis confirmed statistically significant improvements in fasting blood glucose and lipid profiles in adults with metabolic disease, diabetes, or metabolic syndrome. 1 Individual clinical studies reviewed include a trial in T2DM patients where Tulsi leaf powder (2.5 g/day for 2 months) significantly reduced fasting and post-prandial blood glucose alongside LDL cholesterol, and a clinical study in metabolic syndrome patients where 300 mg/day extract significantly reduced blood glucose, BMI, and inflammatory markers. The mechanisms involve eugenol's α-glucosidase inhibitory activity (reducing post-meal glucose), ursolic acid's insulin-sensitising PPARγ activity, and the anti-inflammatory effects on pancreatic beta cells. Together these replicate a pattern seen across multiple herbs in this series: multi-mechanism antidiabetic activity that addresses both glucose control and the underlying metabolic inflammation. 4
Eugenol — the dominant compound in Tulsi's volatile oil at up to 72% concentration — is one of the most thoroughly studied natural COX-2 inhibitors in pharmacology. Multiple peer-reviewed studies have confirmed that eugenol inhibits cyclooxygenase-2 (COX-2) — the enzyme that catalyses prostaglandin synthesis and drives inflammation, pain, and fever — at concentrations comparable to some pharmaceutical NSAIDs in cell-based assays. 4 In addition to COX-2 inhibition, eugenol also inhibits lipoxygenase (LOX), NF-κB, and iNOS (inducible nitric oxide synthase) — providing a multi-pathway anti-inflammatory mechanism. Ursolic acid from the leaf adds complementary NF-κB inhibitory activity through a distinct molecular pathway. The combination of eugenol + ursolic acid provides anti-inflammatory activity through three independent mechanisms simultaneously, explaining the consistent anti-inflammatory benefits seen clinically across respiratory conditions, dental health, and metabolic inflammation. 4
Tulsi's radioprotective properties are among its most distinctive and surprising validated activities. The aqueous extract of Tulsi leaves, and specifically the flavonoid glycosides orientin and vicenin isolated from it, have been shown to protect mice against gamma radiation-induced sickness and mortality in multiple peer-reviewed studies. 7 A study in Radiation Research found that Tulsi leaf extract (given intraperitoneally before irradiation) significantly improved survival rates in lethally irradiated mice, with orientin and vicenin identified as the primary active compounds. These compounds selectively protect normal tissues from radiation-induced oxidative damage while appearing to sensitise cancer cells to radiation — a combination of properties that would be of genuine clinical interest in the context of radiotherapy if confirmed in human trials. The radioprotective mechanism involves free radical scavenging, induction of DNA repair enzymes, and upregulation of antioxidant systems (SOD, catalase, GSH). Tulsi joins Triphala as one of the two Ayurvedic medicines in this series with confirmed radioprotective preclinical evidence. 4
Tulsi's antimicrobial activity is among its most broadly validated properties — confirmed across antibacterial, antiviral, antifungal, antiprotozoal, and antimalarial domains. 4 Eugenol is the primary antibacterial compound — with confirmed activity against Staphylococcus aureus (including MRSA strains), E. coli, Pseudomonas aeruginosa, and a broad range of respiratory and dental pathogens. Antiviral activity has been demonstrated against dengue virus, influenza (H1N1), and herpes simplex — with rosmarinic acid and several terpenoids identified as the primary antiviral compounds. In the context of respiratory health, the combination of antibacterial (eugenol against respiratory pathogens), antiviral (rosmarinic acid, terpenoids), bronchodilatory (β-caryophyllene), and anti-inflammatory (COX-2 inhibition, NF-κB inhibition) properties makes Tulsi a genuinely comprehensive respiratory herb — explaining its primary classical classification as an anti-cough and respiratory herb and its central role in SupaBreathe alongside Trikatu and Vasa. 4
Tulsi's chemopreventive and anticancer properties have been documented across multiple preclinical studies and are summarised in the landmark 2013 PubMed review by Baliga et al. 7 Key findings include: eugenol, rosmarinic acid, apigenin, myrtenal, luteolin, β-sitosterol, and carnosic acid from Tulsi have been shown to prevent chemical-induced skin, liver, oral, and lung cancers in animal models. The mechanisms involve increased antioxidant enzyme activity (SOD, catalase, GSH), altered gene expression affecting cancer-related pathways, induction of apoptosis in cancer cells, and inhibition of angiogenesis and metastasis — a multi-mechanistic anticancer profile consistent with the pattern seen across this ingredient series. The selective radioprotective properties of orientin and vicenin — protecting normal tissues while potentially sensitising cancer cells — represent an additional dimension of particular clinical interest. All anticancer evidence is preclinical and does not constitute a clinical claim. 7
The 2022 RCT — Key Results at a Glance
The Lopresti et al. (2022) Frontiers in Nutrition RCT is the most recent and methodologically rigorous human clinical trial on Tulsi's adaptogenic properties, using standardised extract at a conservative 250 mg/day total dose. 2
Lopresti et al. (2022) — Double-Blind RCT Results (Front. Nutr., PMC9524226)
Traditional Use & Modern Dosage
Tulsi is one of the most versatile herbs in terms of form and vehicle — it can be consumed as a fresh leaf, dried powder, tea, tincture, essential oil, or standardised extract, with different forms best suited to different therapeutic applications. The fresh leaf taken daily is the most traditional form; the standardised extract is the most studied in clinical trials.
| Form | Traditional Preparation | Primary Use |
|---|---|---|
| Fresh Leaves (Daily) | 4–5 fresh leaves chewed or swallowed whole in the morning — the most traditional daily practice in India; or added to food | General immune and adaptogenic maintenance; daily wellness; antimicrobial; the classical Nitya (daily) practice |
| Tea (Tulsi Kwath) | 5–10 leaves simmered in water for 5 min with ginger; strained; taken warm — with honey for cough, with milk for stress | Respiratory conditions, fever, cold and flu, stress relief; 1–2 cups daily |
| Powder (Churna) | Dried leaf powder in warm water or honey; classical concentrated preparation | 2–3 g/day in warm water; antidiabetic, anti-inflammatory, general Rasayana |
| Standardised Extract | Phytochemically standardised extract; form used in clinical trials including Lopresti et al. (2022) | 250–500 mg/day (125–250 mg twice daily); stress, sleep, and immune support — the clinically studied dose range |
| Essential Oil | Steam-distilled Tulsi oil; used topically diluted or as aroma; not for internal use | Topical antimicrobial and anti-inflammatory; skin conditions, wound healing; diffused for respiratory and mood support |
Tulsi is a Nitya Rasayana — safe and beneficial for daily long-term use. Traditional guidance specifies morning use on an empty stomach for Rasayana purposes, and as a warm tea through the day for respiratory conditions. Honey is the preferred vehicle for cough and Kapha conditions; warm milk for stress and Vata conditions. Tulsi also pairs well with ginger (for respiratory), with Trikatu (for digestion and bioavailability), and with Ashwagandha (for a comprehensive adaptogenic stack).
Supaveda Products with Tulsi
Tulsi features in three Supaveda products — addressing respiratory health, skin care, and daily vitality:
Tulsi (Tulasi) is the immunomodulatory and antimicrobial anchor of SupaBreathe — working alongside Trikatu (the warming respiratory formula) and Vasa (Adhatoda vasica, the bronchodilatory herb). While Trikatu clears Kapha and opens airways and Vasa relaxes bronchial smooth muscle, Tulsi's eugenol and rosmarinic acid address the infection and inflammation that underlie most respiratory conditions at the source. Its β-caryophyllene contributes additional bronchodilatory action; its IFN-γ-stimulating immunomodulatory activity builds the respiratory immunity that prevents recurrence. Together, the three herbs cover all three Ayurvedic dimensions of respiratory disease: warming and clearing (Trikatu), opening and relaxing (Vasa), and cleansing and immune-strengthening (Tulsi).
A cold-processed Ayurvedic bar soap combining Tulsi's potent antimicrobial and skin-toning eugenol with Ashwagandha's adaptogenic and skin-nourishing properties. Tulsi's COX-2 inhibitory and antibacterial activity makes it one of Ayurveda's premier topical acne and skin-clarifying herbs — confirmed by multiple preclinical studies on its activity against Cutibacterium acnes. The wheatgerm oil base and vitamin E-rich almond oil nourish while Tulsi cleanses — a balanced formula for face and body.
Our organic, vegan Chyawanprash — 16 Ayurvedic herbs including Tulsi. In the classical Chyawanprash formula, Tulsi plays its dual role of Deepana (stimulating digestive fire to ensure proper assimilation of all other herbs) and Bhutaghni (clearing microbial and toxic accumulations from the channels). Its antimicrobial, immunostimulant, and adaptogenic properties contribute to the overall rejuvenative and protective action of the formula — appropriate for the herb that has been found growing in the courtyard of every Chyawanprash-taking household for three thousand years.
Safety & Precautions
Tulsi has an excellent safety record across centuries of daily food-level consumption by hundreds of millions of people. The 2017 systematic review found no significant adverse effects reported across 24 human studies. The following precautions apply primarily at therapeutic supplement doses: 1
Please note
- Pregnancy and fertility — caution advised: Animal studies have confirmed anti-implantation and abortifacient effects of Tulsi seed oil at high doses. At culinary amounts (a few fresh leaves daily), no harm has been demonstrated and Tulsi is widely consumed by pregnant women in India. However, therapeutic supplement doses (standardised extracts, large powder doses) should be avoided during pregnancy and when actively trying to conceive. 3
- Blood-thinning medications: Eugenol has mild antiplatelet (anti-clotting) activity. Those on anticoagulants (warfarin, aspirin, clopidogrel) should maintain consistent Tulsi intake rather than suddenly changing doses, and inform their healthcare provider. 4
- Antidiabetic medications: Tulsi lowers blood glucose through multiple mechanisms. Those on insulin or oral antidiabetic drugs should monitor glucose levels and consult their healthcare provider before significantly increasing therapeutic intake.
- Thyroid medications: High doses of Tulsi may have mild anti-thyroid effects — those on thyroid medication should use conservative doses and monitor thyroid function.
- Before surgery: Due to mild antiplatelet activity, therapeutic Tulsi supplementation should be paused 2 weeks before elective surgery.
- Children and general use: Culinary amounts of fresh Tulsi are safe for children. Concentrated supplements should be at age-appropriate doses. Avoid concentrated essential oil internally in children.
Key Takeaways
Evidence-backed bullet points:
Found in 800 million Indian homes — the most universally cultivated medicinal plant in the world; described in the Rigveda (~1500 BC) making it one of the oldest continuously used medicines in human history
2022 double-blind RCT: stress (PSS) p=0.003; sleep quality (AIS) p=0.025; hair cortisol significantly lower (p=0.025) — objective physiological evidence of reduced chronic stress hormone over 8 weeks
Immunomodulatory RCT: significantly increased IFN-γ, NK cell activity, and T-helper cells — both innate and adaptive immunity enhanced in healthy volunteers (Mondal et al., J. Ethnopharmacology 2011)
PMC systematic review of 24 human clinical studies — more human clinical evidence than almost any other Ayurvedic herb; confirmed therapeutic effects on metabolic disorders, cardiovascular disease, immunity, and neurocognition
Eugenol (up to 72% of volatile oil) inhibits COX-2 comparably to some NSAIDs — the same anti-inflammatory mechanism as ibuprofen, through a natural food compound
Orientin and vicenin — two flavonoids unique to Tulsi — protect against gamma radiation-induced mortality and DNA damage in peer-reviewed studies
The 2014 Cohen PMC review catalogued over 20 distinct pharmacological properties confirmed by science — the broadest validated therapeutic spectrum of any herb in this series
Eugenol + rosmarinic acid + β-caryophyllene give Tulsi three complementary respiratory mechanisms — antibacterial, antiviral, and bronchodilatory — explaining its central role in SupaBreathe
Meta-analysis: significantly reduces fasting blood glucose and improves lipid profiles in adults with metabolic disease — multiple human RCTs confirmed
Excellent safety at culinary doses; avoid therapeutic doses during pregnancy; mild antiplatelet activity — inform GP if on anticoagulants; generally safe as daily tea or fresh leaves for most adults
References
- Jamshidi, N. and Cohen, M.M. (2017) 'The clinical efficacy and safety of Tulsi in humans: a systematic review of the literature', Evidence-Based Complementary and Alternative Medicine, 2017, p.9217567. doi: 10.1155/2017/9217567. PMC5376420. PMID: 28400848. [Primary systematic review; 24 human studies; metabolic disorders, cardiovascular disease, immunity, neurocognition; meta-analysis confirming significant fasting glucose and lipid improvements; immunomodulatory RCT classification; Mondal 2011 quality assessment].
- Lopresti, A.L., Smith, S.J., Metse, A.P. and Drummond, P.D. (2022) 'A randomized, double-blind, placebo-controlled trial investigating the effects of an Ocimum tenuiflorum (Holy Basil) extract (HolixerTM) on stress, mood, and sleep in adults experiencing stress', Frontiers in Nutrition, 9, p.965130. doi: 10.3389/fnut.2022.965130. PMC9524226. PMID: 36185698. [Primary 2022 RCT; n=100; PSS p=0.003; AIS p=0.025; hair cortisol p=0.025; 125 mg twice daily standardised extract; 8 weeks].
- Khanna, N. and Bhatia, J. (2003) 'Antinociceptive action of Ocimum sanctum (Tulsi) in mice: possible mechanisms involved', Journal of Ethnopharmacology, 88(2-3), pp.293–296. doi: 10.1016/S0378-8741(03)00252-3. [Anti-implantation and abortifacient effects of Tulsi seed oil at high doses; pregnancy caution basis. Also: WHO Monographs on Selected Medicinal Plants (Vol. 4) — anti-fertility effects noted].
- Cohen, M.M. (2014) 'Tulsi — Ocimum sanctum: a herb for all reasons', Journal of Ayurveda and Integrative Medicine, 5(4), pp.251–259. doi: 10.4103/0975-9476.146554. PMC4296439. PMID: 25624701. [Comprehensive review: 20+ confirmed pharmacological properties; eugenol COX-2 inhibition; radioprotective, chemopreventive, antimicrobial, adaptogenic evidence; heavy metal protection; physical/chemical/metabolic/psychological stress protection; HPA axis modulation; Rigveda historical documentation; varieties overview].
- Asian Journal of Medicine and Health Sciences (2025) 'A bibliometric review of holy basil (Ocimum tenuiflorum) and its therapeutic potential in dermatological applications', AJMHS, doi: 10.55230/mabjournal.v13i2.article1041. [2025 bibliometric review; five research clusters; bioactive compounds profile 2000–2024; 2022 Lopresti RCT cited; HolixerTM HPA axis mechanistic study].
- Mondal, S., Varma, S., Bamola, V.D., Naik, S.N., Mirdha, B.R., Padhi, M.M., Mehta, N. and Mahapatra, S.C. (2011) 'Double-blinded randomized controlled trial for immunomodulatory effects of Tulsi (Ocimum sanctum Linn.) leaf extract on healthy volunteers', Journal of Ethnopharmacology, 136(3), pp.452–456. doi: 10.1016/j.jep.2011.05.012. PMID: 21619917. [Primary immunomodulatory RCT; n=24 healthy volunteers; 300 mg/day 4 weeks; IFN-γ significantly increased; NK cell activity enhanced; T-helper cell counts improved; Th1/Th2 balance improved].
- Baliga, M.S., Jimmy, R., Thilakchand, K.R., Sunitha, V., Bhat, N.R., Saldanha, E., Rao, S., Rao, P., Arora, R. and Palatty, P.L. (2013) 'Ocimum sanctum L (Holy Basil or Tulsi) and its phytochemicals in the prevention and treatment of cancer', Nutrition and Cancer, 65(Suppl 1), pp.26–35. doi: 10.1080/01635581.2013.785010. PMID: 23682780. [Radioprotective: orientin and vicenin protect against gamma-radiation in mice; chemopreventive: eugenol, rosmarinic acid, apigenin, myrtenal, luteolin, β-sitosterol prevent chemical-induced cancers; mechanisms: antioxidant enzyme induction, gene expression alteration, apoptosis, anti-angiogenesis].
- Mohan Gowda, C.M., Murugan, S.K., Bethapudi, B. et al. (2022) 'Ocimum tenuiflorum extract (HolixerTM): Possible effects on hypothalamic-pituitary-adrenal (HPA) axis in modulating stress', cited in Asian J Med Health Sci 2025. [Mechanistic HPA axis study supporting Lopresti 2022 RCT; corticosterone normalisation; adrenal function regulation].
- Sampath, S., Mahapatra, S.C., Padhi, M.M., Sharma, R. and Talwar, A. (2015) 'Holy basil (Ocimum sanctum Linn.) leaf extract enhances specific cognitive parameters in healthy adult volunteers', Indian Journal of Physiology and Pharmacology, 59(1), pp.69–77. PMID: 26571987. [Cognitive enhancement RCT; attention, working memory, and cognitive flexibility improvements; part of the 24-study systematic review].
- Rai, V., Iyer, U. and Mani, U.V. (1997) 'Effect of Tulsi (Ocimum sanctum) leaf powder supplementation on blood sugar levels, serum lipids and tissue lipids in diabetic rats', Plant Foods for Human Nutrition, 50(1), pp.9–16. doi: 10.1007/BF02436038. PMID: 9017726. [Antidiabetic evidence; blood glucose reduction; lipid profile improvement; α-glucosidase inhibitory mechanism of eugenol; part of Jamshidi and Cohen 2017 meta-analysis dataset].