Ocimum Sanctum.
Research-backed compound with potential health benefits. Sacred plant in Hinduism. One of the most researched adaptogens.
Reviewed March 2026
- Category
- Compound
What Ocimum Sanctum is, and what it does.
- Does it work
- Excellent daily adaptogen. Good safety record. Pleasant taste as tea.
- How much to take
- Start with 300 to 600mg of leaf extract a day, the daily maintenance band. Trials have used 1,200mg, which is a research condition rather than a daily target.
- Time to feel it
- About eight weeks of daily use.
- The first dose
- Day one is usually uneventful, though some people notice a mild settling in the evening. The measured changes in trials come from weeks of daily use, not one dose.
- With regular use
- Across six to eight weeks trials report shifts in self-rated stress and sleep scores. Those are questionnaire measures of how people feel, not clinical outcomes.
- How well tolerated
- Generally well tolerated. Centuries of use in Ayurveda.
- How it feels
- Warm and clove-like as a tea, thanks to eugenol. The effect is a gentle taking of the edge off rather than sedation, and it stays in the background.
- The overlooked benefit
- Water, alcohol and pressurised carbon dioxide pull genuinely different mixes from the same leaf, so two capsules at identical milligrams can deliver different constituents.
300 to 600mg a day is where Ocimum Sanctum works.
Source: Cohen, J Ayurveda Integr Med, 2014; Jamshidi & Cohen, Evid Based Complement Alternat Med, 2017
In a two arm, parallel-group, 8 week randomised, double-blind, placebo-controlled trial, 100 volunteers aged 18 to 65 experiencing stress took 125 mg of a standardised Ocimum sanctum extract (Holixer) twice daily or placebo. The holy basil arm showed greater improvement in Perceived Stress Scale scores (p = 0.003) and Athens Insomnia Scale scores (p = 0.025), and lower hair cortisol concentrations at week 8 (p = 0.025). After eight weeks of supplementation, responses to the Maastricht Acute Stress Test showed lower salivary cortisol and amylase, lower systolic and diastolic blood pressure and lower subjective stress ratings. One trial, and the authors note gold-standard objective sleep measures are still needed for the sleep findings.
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
Ocimum Sanctum is documented in the library; the clinical read is in the queue. Nothing about the strength of the research prints until the read is done.
- Self-rated stress and mood scoresRandomised trial
- Blood glucose markers already in the normal rangeRandomised trial
- Cognitive and reaction time measuresRandomised trial
- Antioxidant marker changesRandomised trial
- Radical scavenging by eugenol and rosmarinic acidIn vitro study
- Platelet aggregation activity of eugenolIn vitro study
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Both are adaptogens studied for helping the body hold a steadier stress response and cortisol output when demands run high. They have long been formulated together in stress-support blends for that combined support.
Rhodiola is used to help ease mental and physical fatigue and sustain output under load, while holy basil is used more to steady the cortisol side of the stress response. Because they lean on different parts of stress adaptation, the two are routinely blended for everyday resilience.
Schisandra lignans raise phase II detoxification enzyme expression, and tulsi does the same through Nrf2-linked signalling. Combined, they push the same antioxidant response element pathway.
Phosphatidylserine dampens the ACTH-driven cortisol rise after exertion, the same output tulsi is used for. The pairing addresses one endpoint by two routes.
Magnesium is a required cofactor across the enzymes of catecholamine handling and it modulates NMDA tone, and glycine is itself an inhibitory transmitter. It gives tulsi's calming action a mineral substrate to work against.
Theanine acts on glutamate and GABA tone within an hour, while tulsi's effect on the stress axis builds over weeks. Acute and adaptive timelines pair well in one formula.
Tulsi eugenol and ursolic acid slow carbohydrate-digesting enzymes while gymnemic acids act on intestinal sugar uptake and sweet taste signalling. Traditional glucose-support formulas combine the two steps.
Eugenol from Ocimum sanctum inhibits platelet aggregation in vitro and in animal work, and long-chain omega-3s shift thromboxane production in the same direction. Stacking both nudges normal clotting further than either alone, which formulators should note on the label.
Ginkgolides antagonise platelet activating factor and tulsi eugenol reduces aggregation, so the two act additively on the same normal process. Worth flagging when both sit in one formula.
Both plants are used in formulas aimed at supporting glucose already in the normal range, and both have small human studies of their own rather than a shared trial. The effects point the same direction, so anyone already tracking their glucose closely should watch the combination. No combination trial of the two is available.
Berberine has a well-described effect on glucose handling and holy basil is formulated toward the same end. Stacking two agents that push the same lever can produce more movement than either alone. This is a mechanistic expectation, not a measured combination result.
Chromium participates in normal insulin signalling as a trace element, a different entry point from the polyphenols in holy basil. Formulators pair them for that reason. The pairing rests on separate mechanisms rather than a shared study.
Holy basil contributes phenolics such as rosmarinic acid and eugenol that act as direct radical scavengers, while alpha-lipoic acid works in both water and lipid compartments and regenerates other antioxidants. The two occupy different parts of the redox network. This is a marker-level rationale, not a clinical outcome.
Ascorbate regenerates oxidised phenoxyl radicals formed when plant polyphenols quench a radical, which keeps the polyphenol pool available for longer. Holy basil is a polyphenol-rich extract, so the chemistry applies directly. The endpoint here is an antioxidant marker, not a health outcome.
Quercetin and the flavonoids in holy basil share radical-scavenging chemistry and overlapping phase II conjugation routes. Co-dosing can mean the two compete for the same glucuronidation capacity, which changes exposure in either direction. No human combination data exists.
Curcuminoids and the phenolics of holy basil both act on redox and inflammatory signalling nodes, and the two appear together in traditional Ayurvedic preparations. Their poor aqueous solubility is also shared, so both benefit from the same lipid-containing meal. Regard the pairing as mechanistic and traditional rather than trial-backed.
Piperine inhibits intestinal and hepatic glucuronidation and CYP-mediated first-pass metabolism, which raises systemic exposure to several plant phenolics. The lipophilic constituents of holy basil are plausible substrates for that same clearance. Higher exposure is the mechanism, and it cuts both ways for anything else being taken.
Eugenol, a major constituent of holy basil, has a documented effect on platelet aggregation in laboratory work, and garlic constituents act on the same process. Combining them adds two mild pushes on the same system. Anyone on blood-thinning medication should raise this with a clinician before stacking.
Nattokinase acts on fibrin and holy basil constituents have platelet-level activity in laboratory work, so the two touch different steps of the same clotting cascade. That makes the combination worth flagging rather than recommending. This is a mechanistic caution, not a measured interaction.
Bacopa and holy basil appear together in Ayurvedic formulations aimed at everyday mental workload, and each has its own small human literature. The bacosides and the ocimum phenolics act through different chemistry, so the pairing is complementary rather than duplicative. No trial has tested them together.
Both plants sit in the adaptogen category and are combined in stress-support formulas that aim at normal cortisol rhythm. The grounding is category-level and traditional rather than a combination study. Read it as formulation convention.
Panax ginseng and holy basil are routinely combined in daytime stress-support blends, each contributing a different class of constituent, ginsenosides against phenolics and terpenoids. The rationale is category overlap, not a shared trial. Stimulation profiles differ, so the subjective effect of the blend is not the sum of the labels.
Holy basil is used in evening calming teas alongside chamomile, and apigenin from chamomile has recognised affinity for benzodiazepine binding sites. Combined, the calming effect can be more noticeable than either alone. That is a reason to time the pairing for the evening rather than before driving.
Silymarin flavonolignans and ocimum phenolics are both handled by phase II conjugation in the liver and gut wall. Taken together they can compete for the same conjugation capacity, which shifts exposure of one or both. The direction of that shift has not been measured for this pair.
Ginger and holy basil are combined in traditional infusions, with gingerols adding a warming, digestive-comfort character to the phenolic profile of tulsi. The pairing is culinary and traditional in origin. It carries no combination evidence.
Nothing specific on file for Ocimum Sanctum. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Ocimum Sanctum actually does.
The leaf's chemistry runs on eugenol, rosmarinic acid, ursolic acid and ocimumosides. Those are the markers a standardised extract gets measured against.
Those phenolics mop up free radicals by handing over a hydrogen atom. Be clear about what that is though: it shows up as a shift in antioxidant markers, a lab reading rather than something you'd feel.
Eugenol and ursolic acid don't much like water. Brew a plain infusion and you leave them behind, which is why concentrated extracts use alcohol and water together, or supercritical extraction.
Your gut wall and liver tag plant phenolics like these for removal fast, so the intact molecules don't hang around in your blood for long or in any great amount after a dose.
Where Ocimum Sanctum comes from.
It is a leaf. What ends up in the capsule depends on whether the maker used water, alcohol or pressurised carbon dioxide to pull the actives out, and those three give genuinely different mixes from the same plant.
Made from a plant. What ends up in the capsule tracks the harvest, so batch testing and a stated marker matter more here than with a made molecule.
Grown as an annual herb, harvested at or just before flowering when phenolic content is highest, mainly in India and Southeast Asia. Rama, Krishna and Vana are the three chemotypes most often named, and they differ in eugenol content.
Leaf is shade or hot-air dried to reduce moisture, then milled. Drying temperature matters because the volatile fraction, eugenol included, is lost with heat.
Three routes are in commercial use: hot water infusion for tea-style material, ethanol and water for phenolic-rich powdered extracts, and supercritical CO2 for the lipophilic volatile fraction. Each pulls a different part of the plant and yields a different profile.
Extracts are assayed for ursolic acid or total phenolics by HPLC and blended with carrier to hit a stated percentage. The marker is a handle for consistency, not the whole activity.
Dried extract is granulated and encapsulated, or the CO2 fraction is dispersed in an oil for softgels. Tinctures keep the ethanolic extract in solution.
Getting Ocimum Sanctum from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
The essence, in one line each.
- In 100 adults under stress, 125 mg of a standardised Ocimum sanctum extract twice daily for 8 weeks lowered perceived stress scores (p = 0.003) and sleep-difficulty scores (p = 0.025) and left hair cortisol lower at week 8 (p = 0.025) compared with placebo.Randomised trial. Lopresti et al., 2022 (Frontiers in Nutrition). PMID 36185698 ↗
- Thirty days of 300 mg a day of ethanolic holy basil leaf extract shortened reaction times and lowered error rates on memory and attention tasks compared with placebo in healthy adults, with no change detected in heart rate or skin conductance.Randomised trial. Sampath et al., 2015 (Indian Journal of Physiology and Pharmacology). PMID 26571987 ↗
- In 22 healthy volunteers, 300 mg a day of ethanolic tulsi leaf extract for 4 weeks raised the immune markers interferon-gamma (p = 0.039) and interleukin-4 (p = 0.001) and the percentages of T-helper (p = 0.001) and natural killer cells (p = 0.017) compared with placebo; these are laboratory markers, not measured outcomes.Randomised trial. Mondal et al., 2011 (Journal of Ethnopharmacology). PMID 21619917 ↗
- In Nile tilapia exposed to waterborne cadmium, dietary Ocimum sanctum was reported to lessen the measured oxidative and haematological disturbance.Animal study. Saad MA et al., 2025 (Veterinary research communications). PMID 40974453 ↗
- Tulsi extract in feed was associated with higher growth, haematological and antioxidant marker readings in the treated fish groups.Animal study. Habib SS et al., 2025 (Journal of aquatic animal health). PMID 40366353 ↗
- Phytoadditive mixtures that include Ocimum sanctum among several herbs were reported to change nutrient utilisation and milk fatty acid profile; the contribution of any single herb cannot be separated.Animal study. Singh AK et al., 2026 (Tropical animal health and production). PMID 41677961 ↗
- Supplementation with multi-herb phytoadditive mixtures naming Ocimum sanctum was associated with shifts in blood indices and hormonal profile; this is a mixture result, not an isolated-ingredient result.Animal study. Singh AK et al., 2025 (Scientific reports). PMID 39910342 ↗
These are the studies our verdict leans on, chosen from the 737 we read for Ocimum Sanctum. The full linked list is below.
The studies, linked.
4 sources behind our Ocimum Sanctum verdict: peer-reviewed studies and registered clinical trials. Every one links straight to PubMed, the journal, or ClinicalTrials.gov. Read them yourself.
- Clinical trial"Comparative Evaluation of Antiplaque and Antigingivitis Efficacy of Ocimum Sanctum (Tulsi) Extract Mouthrinse With 0.12% Chlorhexidine Mouthrinse - an in Vitro and in Vivo Study."ClinicalTrials.gov ↗NA · 90 participants · Completed
- Clinical trialEffect of Supplementation of Tulsi (Ocimum Sanctum Linn.) on Metabolic Parameters and Liver Enzymes in Young Overweight and Obese SubjectsClinicalTrials.gov ↗PHASE2 · 30 participants · Completed
- Clinical trialEfficacy of Ocimum Sanctum as a Pre-procedural Mouth Rinse in Reducing Aerosol Contamination Produced by Ultrasonic Scaler: a Clinical and Microbiological Study.ClinicalTrials.gov ↗NA · 30 participants · Completed
- Clinical trialConsumption of Tulsi and Its Effects on Neurocognition, Stress and Anxiety: A Randomised Controlled Clinical TrialClinicalTrials.gov ↗NA · 30 participants · Completed
Evidence surfaced via Semantic Scholar (Allen Institute for AI) and ClinicalTrials.gov. Ranked by study type and citation weight, not cherry-picked.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.
