Herb Profile

Passionflower

Passiflora incarnata

Systematic review included 9 clinical trials with study durations from 1 to 30 days; most reported reduced anxiety, with less clear effects in mild anxiety and limited standardization.

Last reviewed: July 9, 2026•6 sources citedReport a correctionProfile-wide ·B Moderate

Use extra caution — May reduce anxiety symptoms in some studied contexts; may be relevant to sleep when anxiety is the driver. Details

Evidence: Moderate Evidence
Typical onset: Varies by prep
Safety rating: High caution
Best for: Sleep, Stress, Cognitive function
Avoid / review if: Sedatives, SSRIs (Theoretical MAOI Overlap)

The Hippie Scientist illustration

Verdict: PassionflowerMaybe

Best for

Mild anxiety with restlessness
Occasional trouble winding down at night

Not ideal for

Severe insomnia
Panic attacks
A same-strength benzodiazepine substitute

Evidence confidence: Early–moderate — a handful of supportive small trials
Expected onset: 30–60 minutes
Give it: 1–4 weeks

Bottom line: A mild, calming herb with modest trial support for anxiety and sleep onset. Best as a gentle option or stack ingredient, not a heavyweight sedative.

Safety: Can add to the sedation of alcohol or other sleep aids; avoid in pregnancy and discuss with a clinician before combining with sedatives.

On the evidence: Small randomized trials for anxiety and sleep; effects are modest.

How strong is the evidence?Limited

Why not higher

Trials are small and often combine passionflower with other herbs
Preparations and doses vary
Effects are modest

Why not lower

A few randomized trials support mild anxiety and sleep-onset benefit
Long traditional use and good tolerability

Practical takeaway: A gentle option for mild anxiety or trouble winding down, best as a stack ingredient rather than a stand-alone fix for significant insomnia.

Next stepsWhere to go next — guides & comparisons

Start here

New to this? Begin with Best herbs for anxiety.

Compare first

Sleep herbs vs. melatonin — if choosing a sleep-onset aid
Beyond ashwagandha: other anxiolytics — if anxiety is the main target

If you want help sleeping → Sleep guides
If you want help with anxiety or stress → Anxiety & stress guides
If you want to browse more herbs → All herbs

Safety

Safety & Cautions

May reduce anxiety symptoms in some studied contexts; may be relevant to sleep when anxiety is the driver. | Do not claim proven insomnia treatment or benzodiazepine replacement.

High caution

Caution level: High. Multiple caution categories apply, or the record uses avoid/contraindication language.

Interaction-AwareMedication or interaction context is explicitly noted.
Stimulant-Like ProfileStimulant-like or activating caution language is present.

Detailed safety fields

Pregnancy, breastfeeding, and contraindications

Sedatives
SSRIs (Theoretical MAOI Overlap)

Safety classifications

Interaction-Aware: Medication or interaction context is explicitly noted.
Stimulant-Like Profile: Stimulant-like or activating caution language is present.

Full safety note

May reduce anxiety symptoms in some studied contexts; may be relevant to sleep when anxiety is the driver. | Do not claim proven insomnia treatment or benzodiazepine replacement. | Position as anxiety/sedative herb with limited standardized dosing evidence.

Safety labels

Interaction-Aware
Stimulant-Like Profile

Evidence-based safety

Caution when combined

Severity and certainty are shown separately. A high-priority caution can still be theoretical: these pairings are screened from shared contraindication mechanisms and are not automatically documented clinical interactions. Provenance identifies the source fields that produced each flag; it does not upgrade the certainty of the pairwise claim.

High-Priority Caution

26 flagged pairings

Serotonergic activity

Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.

Serotonergic activityCertainty: Theoretical

Data provenance recorded for 26 of 26 pairings in this mechanism group.

5-HTP — Theoretical interaction certainty
Caffeine — Theoretical interaction certainty
crocetin — Theoretical interaction certainty
crocin — Theoretical interaction certainty
Crocus Sativus — Theoretical interaction certainty
Damiana — Theoretical interaction certainty
DMT — Theoretical interaction certainty
Ginkgo — Theoretical interaction certainty
Panax Red Ginseng — Theoretical interaction certainty
Panax White Ginseng — Theoretical interaction certainty
Harmaline — Theoretical interaction certainty
Harmine — Theoretical interaction certainty

+14 more pairings share this mechanism. Use the Safety Checker to review a specific combination.

Moderate Caution

68 flagged pairings

Sedation / CNS depression

Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.

Sedation / CNS depressionCertainty: Theoretical

Data provenance recorded for 68 of 68 pairings in this mechanism group.

+56 more pairings share this mechanism. Use the Safety Checker to review a specific combination.

Evidence

Evidence Summary

Evidence lens

Useful signal, but study design, dose, and population still matter.

ModerateModerate Evidence

Human clinical evidence: Present in source signals

Mechanistic / preclinical: Mechanism mapped — Neurotransmitter Modulation · Stress Response Modulation

Research maturity: Established research — Long Term Human Evidence May Be Limited.

Safety boundary: Safety note available — May reduce anxiety symptoms in some studied contexts; may be relevant to sleep when anxiety is the driver.

This profile cites 6 human studies.

Study design details

Evidence Grade

Grade B: Moderate Evidence

Evaluation of methodological rigor, population reach, and evidence alignment.

Design Match: Meta-analysis
Risk of Bias: Low
Consistency: Consistent

Strongest recorded design is a meta-analysis, drawn from 8 recorded studies, 8 in people. No disagreement is recorded across them.

How evidence grades work

Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.

Strong: Multiple RCTs, consistent direction, adequate effect size
Moderate: Some RCTs or consistent observational data in humans
Preliminary / Mixed: Animal or in-vitro only, or conflicting human data
Traditional / Theoretical: Traditional use only; no controlled human trials

Clinical Study Summaries (7)6 human evidence sources · 3 human trials · ~60 participants across 1 human evidence source with reported N · Consistency not yet classifiable

Filter by study class

Showing 7 of 7 studies.

What the evidence actually shows

This table contains 7 structured sources, including 6 human evidence sources; 3 are human trials. Across 1 human evidence source with a reported sample size, the approximate participant total is 60; overlapping publications may include some of the same people. Source-to-conclusion relationships are not classified in this structured set, so consistency is not yet classifiable.

Profile-wide evidence grade: see the profile grade above · Confidence: not separately assigned

What would change our conclusion?

Larger, well-controlled human trials using comparable populations, doses, preparations, and clinically meaningful outcomes could materially strengthen or weaken this conclusion. Replication in a different population or a high-quality synthesis resolving current disagreement could also materially change confidence.

Study	Design	N	Dose	Duration	Population	Outcome	Result & magnitude	Source
Medicinal herbs for the treatment of anxiety: A systematic review and network meta-analysis Zhang W et al. · Pharmacol Res · 2022 Background	Meta-analysis Statistically combines results from multiple eligible studies; confidence still depends on the quality, consistency, and directness of those studies.	—	—	—	—	—	—	PubMed →
Passiflora incarnata in Neuropsychiatric Disorders-A Systematic Review K. Janda; Karolina Wojtkowska; K. Jakubczyk; Justyna Antoniewicz; K. Skonieczna-Żydecka · Nutrients · 2020 Background	Systematic review Uses a predefined method to find and evaluate relevant studies, but may or may not pool their results statistically.	—	—	—	—	—	—	PubMed →
Herbal medicine for depression and anxiety: A systematic review with assessment of potential psycho-oncologic relevance Yeung KS et al. · Phytother Res · 2018 Background	Systematic review Uses a predefined method to find and evaluate relevant studies, but may or may not pool their results statistically.	—	—	—	—	—	—	PubMed →
Preoperative oral Passiflora incarnata reduces anxiety in ambulatory surgery patients: a double-blind, placebo-controlled study PubMed · Anesth Analg · 2008 Background	Randomized controlled trial Randomly assigns participants to interventions or controls, reducing many sources of bias when the trial is conducted well.	n=60	—	—	—	—	—	PubMed →
Randomized, Double-Blind, Placebo-Controlled, Clinical Study of Passiflora incarnata in Participants With Stress and Sleep Problems Background	Randomized controlled trial Randomly assigns participants to interventions or controls, reducing many sources of bias when the trial is conducted well.	—	—	—	—	—	Stress, sleep, and quality-of-life measures improved versus placebo.	PubMed →
Effects of Passiflora incarnata and Valeriana officinalis in the control of anxiety due to tooth extraction: a randomized controlled clinical trial Background	Randomized controlled trial Randomly assigns participants to interventions or controls, reducing many sources of bias when the trial is conducted well.	—	—	—	—	—	Both Passiflora and valerian groups showed reduced state anxiety over the dental procedure compared with placebo.	PubMed →

Show 1 more study

A Passiflora incarnata extract exerts multi-target effects on selected sleep-related receptors

Background

Mechanistic research

Studies biological pathways or mechanisms. It can explain plausibility but does not by itself establish a clinical benefit.

—

The extract showed activity at adenosine A1/A2A and 5-HT2A-related targets and inhibited monoamine uptake in vitro.

PubMed →

Dosing & Timing

No standardized dose: Dose varies by preparation and trial; do not infer a universal dose without trial specific extraction. | Passiflora incarnata preparations; tea/extract/drop/combinations need separate handling.

How Passionflower works

Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.

Mechanism Pathway — How Passionflower Works

CompoundTarget / ReceptorMechanismEffect / Outcome

Mechanisms & biological pathways

Preclinical pathways. Proposed mechanisms from in vitro and animal research; these do not confirm clinical outcomes in humans.

Neurotransmitter Modulation
Stress Response Modulation

Compare related active botanicals

Explore botanicals with similar chemistry, effects, or safety considerations in the Botanical Activity Atlas.

Guides that use Passionflower

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Compare & Sourcing

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Sourcing options

Passionflower product picks

Recommendation status

Product recommendations are not shown for this profile because the current site safety and monetization policy does not permit them.

Product form & quality guidelines

When sourcing Passionflower, verify the label for:

Standardized extract: Confirm active content percentages on the supplement facts panel (e.g. standardized to specific marker compounds) rather than simple raw herb weights.
Third-party testing: Look for independent purity labels (USP, NSF, ConsumerLab, or Eurofins) to ensure the product is free from heavy metals, solvents, and contaminants.
Form bioavailability: Ensure the form matches evidence-supported configurations (e.g. standardized active extracts like bacosides, withanolides, or curcuminoids) for optimal onset and digestion tolerance.

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Safety first · Harm reduction

This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.

Learn how we evaluate confidence, safety, and intensity on the methodology page.

Editorial Review

Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.

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Botanical profile context

How to interpret Passionflower

Passionflower herb profile with evidence context, key research topics, source notes, safety context, and references presented in an evidence-first format. Use this herb profile as a starting point for evidence review, not as a recommendation to start a new supplement. Botanical products can vary by plant part, extract ratio, standardization, dose, and contaminant testing, so two labels with the same common name may not behave the same way.

When reviewing Passionflower, compare the traditional-use context against the human evidence, mechanism notes, and safety cautions. Pay special attention to pregnancy, breastfeeding, liver or kidney disease, blood-pressure effects, sedation, stimulation, anticoagulant use, antidepressants, and any prescription medication overlap.

For product decisions, prefer transparent labels, named extracts, clear serving sizes, and third-party quality testing. Avoid treating a long list of possible mechanisms as proof that an herb will solve a specific condition.