Holy Basil
Also sold as: Tulsi · Ocimum tenuiflorum · Ocimum sanctum
A leaf botanical studied for perceived stress, mood and selected cognitive measures. Small heterogeneous trials do not establish it as an anxiety-drug substitute or a universal adaptogen.
Anxiety Focus
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Research
- Focus: One small healthy-adult study improved selected cognitive measures, with other measures unchanged.
- Anxiety: Small stress/GAD studies suggest improvement; products differ and large replicated trials are absent.
REALITY CHECK // A ritual herb is not a proven treatment for adrenal fatigue, cancer or low testosterone. Most clinical studies are small, preparations vary, and immune/cardiometabolic mechanisms are not established patient benefits. Tincture superiority is anecdotal; oil safety cannot be generalized to leaf extracts.
Levels: how we grade evidence. Grey = evidence of no benefit; amber = evidence it makes this goal worse.
Ratings are self-reported by a self-selected group of users: how it felt, not proof that it works.
Check your bottle
Compare what your label says with what was used in trials. This is a trial range, not a personal prescription.
Enter the amount from your label to see the result.
How it was studied
UPPER LIMIT // No established numeric EFSA/NIH UL is supplied. Sparse short-term safety findings do not settle chronic high-dose exposure. Essential oil raises distinct estragole/methyleugenol concerns and must not be treated as equivalent to leaf extract.
Summary
An approximately 100-person eight-week Holixer RCT reported improved perceived stress, mood and sleep. A 24-study human review reported favorable findings but small heterogeneous studies limit confidence. Glucose lowering has a human signal; immune-marker changes do not establish fewer infections.
Mechanism
HPA-axis/cortisol modulation is proposed rather than a proven mediator of clinical anxiety benefit. Insulin secretion and antioxidant effects are supported mainly by preclinical work.
Typical studied dose
The dossier gives a broad approximate 300 mg-2 g/day extract range across human studies, without trial-specific dose attribution or preparation equivalence. No single reference dose is established; form-specific calculator ranges are unavailable.
Upper limit
No established numeric EFSA/NIH UL is supplied. Sparse short-term safety findings do not settle chronic high-dose exposure. Essential oil raises distinct estragole/methyleugenol concerns and must not be treated as equivalent to leaf extract.
Popular stacks with Holy Basil
Not enough stack data yet. A combination with Holy Basil appears here once 5 people rate the same set.
Forms and label traps
| Form on label | Active content | Studied range / day | Absorption & GI tolerance | Verdict |
|---|---|---|---|---|
| Standardized holy-basil leaf extract Best for: Preparation-specific trial comparison |
Unstandardized: active content unknown | no comparable trial range | Trial preparations include Holixer and OciBest, but no universal marker percent or trial-specific mass is provided here. 0% means unknown, not absence of constituents. Usually tolerated at studied amounts; individual gastrointestinal discomfort remains possible. |
Studied standard [FORM // TRIAL_REFERENCE] Trial preparations include Holixer and OciBest, but no universal marker percent or trial-specific mass is provided here. 0% means unknown, not absence of constituents. |
| Dried holy-basil leaf / whole-plant powder Best for: Label comparison |
Unstandardized: active content unknown | no comparable trial range | Constituent content varies between batches; no verified extract-to-leaf ratio or trial-equivalent conversion is available. Usually tolerated at studied amounts; individual gastrointestinal discomfort remains possible. |
Caution [FORM // CHECK_LABEL] Constituent content varies between batches; no verified extract-to-leaf ratio or trial-equivalent conversion is available. |
| Holy-basil tincture / liquid extract Best for: Label comparison |
Unstandardized: active content unknown | no comparable trial range | Reports of faster or stronger effects are anecdotes. No reliable head-to-head exposure comparison or declared dry-herb ratio is supplied. Usually tolerated at studied amounts; individual gastrointestinal discomfort remains possible. |
Caution [FORM // CHECK_LABEL] Reports of faster or stronger effects are anecdotes. No reliable head-to-head exposure comparison or declared dry-herb ratio is supplied. |
| Holy-basil leaf infusion Best for: Label comparison |
Unstandardized: active content unknown | no comparable trial range | A relaxation ritual with variable extraction and dose; not a measured equivalent to a standardized capsule. Usually tolerated at studied amounts; individual gastrointestinal discomfort remains possible. |
Caution [FORM // CHECK_LABEL] A relaxation ritual with variable extraction and dose; not a measured equivalent to a standardized capsule. |
| Holy-basil essential or fixed oil Best for: Do not substitute for a leaf supplement |
Unstandardized: active content unknown | no comparable trial range | Essential and fixed oils are chemically distinct preparations. Essential-oil estragole/methyleugenol concerns and preclinical fixed-oil clotting findings preclude extrapolating leaf-extract safety. Usually tolerated at studied amounts; individual gastrointestinal discomfort remains possible. |
Avoid / not comparable [FORM // CHECK_LABEL] Essential and fixed oils are chemically distinct preparations. Essential-oil estragole/methyleugenol concerns and preclinical fixed-oil clotting findings preclude extrapolating leaf-extract safety. |
Common label traps
- TRAP_01 // TULSI BOOSTS TESTOSTERONE
The claim extrapolates animal data; convincing human benefit is absent, and animal fertility signals warrant caution. - TRAP_02 // NATURAL ANXIETY DRUG
Small studies do not demonstrate equivalence to pharmacotherapy. - TRAP_03 // CANCER CURE OR ADRENAL REPAIR
Cell/animal mechanisms and broad narrative claims do not establish cancer treatment or a remedy for adrenal fatigue. - TRAP_04 // TINCTURE IS ALWAYS STRONGER
Subjective reports are not controlled formulation comparisons; tea, leaf, extract and oils have different composition.
Other outcomes studied
Outside the five leaderboard goals. Same evidence levels as above.
- stress-and-sleep Limited · benefit
Eight-week Holixer trial in about 100 stressed adults reported less perceived stress and better mood/sleep; small and extract-specific.
PMID 36185698 - generalized-anxiety Limited · benefit
Small controlled GAD study suggests lower anxiety/stress scores; not proof of drug equivalence.
PMID 19253862 - evidence-review Limited · benefit
Review of 24 heterogeneous human studies found favorable signals, but small trials and variable preparations limit certainty.
PMID 28400848 - glycemia Limited · benefit
Single-blind crossover trial in type 2 diabetes: fasting glucose -21.0 mg/dL (CI -31.4 to -11.2; -17.6%) and postmeal -15.8 mg/dL (CI -27.0 to -5.6; -7.3%). One small study, not general-population prevention.
PMID 8880292 - insulin-mechanism Anecdotal · benefit
Insulin secretion findings come from perfused pancreas/islets/cells; fructose-fed rat findings concern insulin resistance. These are not additional human RCTs.
PMID 16614387 PMID 18085503 - lipids Anecdotal · benefit
Predominantly rat-model lipid benefits; human findings are mild secondary outcomes, without a dedicated lipid RCT.
PMID 20104265 PMID 21949899 PMID 25646044 PMID 8880292 - immune-markers Limited · benefit
Four-week healthy-volunteer RCT changed cytokines and NK/helper-T-cell markers. It did not establish fewer or shorter infections.
PMID 21619917 - cognition Limited · benefit
One small healthy-volunteer placebo-controlled study improved selected cognitive parameters; some measures were unchanged.
PMID 26571987 - cardiovascular-mechanism Anecdotal · benefit
Fixed-oil blood-pressure/clotting findings and antistress constituents are preclinical, not proven human cardioprotection.
PMID 11694358 PMID 17850106 - extract-toxicology Anecdotal · benefit
Standardized OciBest acute oral/mutagenicity assessment is preclinical and does not establish long-term human safety or essential-oil safety.
PMID 23424203
Reader questions
Which dose and timing should I copy?
No universal reference is established. The dossier range of roughly 300 mg-2 g/day covers different extracts; verify the actual trial preparation before translating it into a protocol.
Can I combine it with an SSRI or mirtazapine?
Direct interaction data are missing, and serotonin-syndrome claims are unconfirmed. A prescriber should assess the combination rather than treating absence of reports as proof of safety.
Does it cause sexual or fertility problems?
Human sexual-adverse-effect reports are anecdotal. Animal antifertility findings cannot quantify human risk, but justify caution when trying to conceive.
What about estragole and heavy metals?
Essential-oil chemical concerns differ from leaf extracts. Seek batch testing for identity and contamination; the dossier does not establish contamination of every product.
Holy basil or ashwagandha?
There is no reliable head-to-head evidence here. Stacking them does not establish better stress relief and may complicate adverse-effect attribution.
Stack interactions
- Caution Diabetes drugs and glucose-lowering supplements [CAUTION // CLINICAL_REVIEW]
Human glucose-lowering evidence motivates concern about additive effects with insulin, sulfonylureas and other treatment; direct interaction trials are absent. Review monitoring with the clinician.
PMID 8880292 PMID 16614387 - Caution Anticoagulants / antiplatelets and surgery [CAUTION // CLINICAL_REVIEW]
Animal clotting-time and human-platelet in vitro findings imply a theoretical bleeding interaction, not a proven clinical interaction. Discuss an individualized perioperative stop plan.
PMID 11694358 PMID 42653832 - Caution Thyroid medication [CAUTION // CLINICAL_REVIEW]
Mouse T4 changes support only theoretical caution with hypothyroidism/levothyroxine; no human interaction is established.
PMID 9721597 - Caution Immunosuppressants [CAUTION // CLINICAL_REVIEW]
Immune-marker changes raise theoretical concern about opposing treatment; no clinical interaction trial establishes this.
PMID 21619917 - Caution Antidepressants, ashwagandha and calming stacks [CAUTION // CLINICAL_REVIEW]
Direct interaction evidence is absent. Serotonin syndrome fears with tulsi are unconfirmed; possible CNS/sedative addition remains theoretical. Ask the prescriber about psychiatric-medication combinations.
Red flags: interactions and who should avoid it
Interactions
Human glucose-lowering evidence motivates concern about additive effects with insulin, sulfonylureas and other treatment; direct interaction trials are absent. Review monitoring with the clinician. Animal clotting-time and human-platelet in vitro findings imply a theoretical bleeding interaction, not a proven clinical interaction. Discuss an individualized perioperative stop plan. Mouse T4 changes support only theoretical caution with hypothyroidism/levothyroxine; no human interaction is established. Immune-marker changes raise theoretical concern about opposing treatment; no clinical interaction trial establishes this. Direct interaction evidence is absent. Serotonin syndrome fears with tulsi are unconfirmed; possible CNS/sedative addition remains theoretical. Ask the prescriber about psychiatric-medication combinations.
Avoid or ask a doctor first if
Avoid supplemental use during pregnancy/breastfeeding; fertility concerns are animal-derived, with human relevance unknown. Seek review when trying to conceive, with diabetes treatment, thyroid disease, immunosuppression or psychiatric medication, and before surgery. Reflux or stomach upset can occur; long-term safety is uncertain.
Sources (PubMed, 16)
- 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.
PMID 36185698 · 2022 · randomized controlled trialEight-week Holixer trial in about 100 stressed adults reported less perceived stress and better mood/sleep; small and extract-specific.
- Controlled programmed trial of Ocimum sanctum leaf on generalized anxiety disorders.
PMID 19253862 · 2008 · randomized controlled trialSmall controlled GAD study suggests lower anxiety/stress scores; not proof of drug equivalence.
- The Clinical Efficacy and Safety of Tulsi in Humans: A Systematic Review of the Literature.
PMID 28400848 · 2017 · systematic review/meta-analysisReview of 24 heterogeneous human studies found favorable signals, but small trials and variable preparations limit certainty.
- Randomized placebo-controlled, single blind trial of holy basil leaves in patients with noninsulin-dependent diabetes mellitus.
PMID 8880292 · 1996 · randomized controlled trialSingle-blind crossover trial in type 2 diabetes: fasting glucose -21.0 mg/dL (CI -31.4 to -11.2; -17.6%) and postmeal -15.8 mg/dL (CI -27.0 to -5.6; -7.3%). One small study, not general-population prevention.
- Ocimum sanctum leaf extracts stimulate insulin secretion from perfused pancreas, isolated islets and clonal pancreatic beta-cells.
PMID 16614387 · 2006 · in vitro studyInsulin secretion findings come from perfused pancreas/islets/cells; fructose-fed rat findings concern insulin resistance. These are not additional human RCTs.
- Prevention of insulin resistance by ingesting aqueous extract of Ocimum sanctum to fructose-fed rats.
PMID 18085503 · 2008 · animal studyInsulin secretion findings come from perfused pancreas/islets/cells; fructose-fed rat findings concern insulin resistance. These are not additional human RCTs.
- Antioxidant Activity and Lipid-Lowering Effect of Essential Oils Extracted from Ocimum sanctum L. Leaves in Rats Fed with a High Cholesterol Diet.
PMID 20104265 · 2010 · animal studyPredominantly rat-model lipid benefits; human findings are mild secondary outcomes, without a dedicated lipid RCT.
- Lipid-lowering and antioxidative activities of aqueous extracts of Ocimum sanctum L. leaves in rats fed with a high-cholesterol diet.
PMID 21949899 · 2011 · animal studyPredominantly rat-model lipid benefits; human findings are mild secondary outcomes, without a dedicated lipid RCT.
- Antidyslipidemic Effect of Ocimum sanctum Leaf Extract in Streptozotocin Induced Diabetic Rats.
PMID 25646044 · 2015 · animal studyPredominantly rat-model lipid benefits; human findings are mild secondary outcomes, without a dedicated lipid RCT.
- Double-blinded randomized controlled trial for immunomodulatory effects of Tulsi (Ocimum sanctum Linn.) leaf extract on healthy volunteers.
PMID 21619917 · 2011 · randomized controlled trialFour-week healthy-volunteer RCT changed cytokines and NK/helper-T-cell markers. It did not establish fewer or shorter infections.
- Holy basil (Ocimum sanctum Linn.) leaf extract enhances specific cognitive parameters in healthy adult volunteers: A placebo controlled study.
PMID 26571987 · 2015 · randomized controlled trialOne small healthy-volunteer placebo-controlled study improved selected cognitive parameters; some measures were unchanged.
- Effect of Ocimum sanctum fixed oil on blood pressure, blood clotting time and pentobarbitone-induced sleeping time.
PMID 11694358 · 2001 · animal studyFixed-oil blood-pressure/clotting findings and antistress constituents are preclinical, not proven human cardioprotection.
- Constituents of Ocimum sanctum with antistress activity.
PMID 17850106 · 2007 · animal studyFixed-oil blood-pressure/clotting findings and antistress constituents are preclinical, not proven human cardioprotection.
- Evaluation of the mutagenic potential and acute oral toxicity of standardized extract of Ocimum sanctum (OciBest™).
PMID 23424203 · 2013 · animal studyStandardized OciBest acute oral/mutagenicity assessment is preclinical and does not establish long-term human safety or essential-oil safety.
- Protective Effects of the Ethanolic Leaf Extract of Ocimum sanctum L. on Collagen-Induced Human Platelet Aggregation and CCl4-Induced Hepatotoxicity in Rats: Molecular Docking Analysis of Platelet Activation Signaling Targets.
PMID 42653832 · 2026 · animal studyAnimal clotting-time and human-platelet in vitro findings imply a theoretical bleeding interaction, not a proven clinical interaction. Discuss an individualized perioperative stop plan.
- Ocimum sanctum leaf extract in the regulation of thyroid function in the male mouse.
PMID 9721597 · 1998 · animal studyMouse T4 changes support only theoretical caution with hypothyroidism/levothyroxine; no human interaction is established.
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