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Botanical & herbal supplements

Passion Flower

Passion flower aerial parts (Passiflora incarnata L.)

Passion Flower usually means the aerial parts of Passiflora incarnata. It is better described as a calming and sleep-support botanical than as a cognitive enhancer. Small trials suggest possible acute benefit for pre-procedure anxiety and modest short-term sleep or stress effects, but the evidence is limited and form-specific. Overall short-term risk is low for many adults; possible drowsiness, dizziness, and confusion still matter. Do not use during pregnancy, discuss use within 2 weeks of surgery, and check medication or sedative combinations with a clinician or pharmacist.

CalmRelaxationSleep SupportStress ResilienceGabaergicWhole HerbStandardized Extract
Updated July 2026/8 min read/9 citations
Prepared by the NootropicsIndex editorial team.Method: prioritize cited human research and official safety or regulatory sources; compare retailer-listed prices without endorsing products.Affiliate disclosure
01

What is it?

Identity matters: this page is about Passiflora incarnata aerial parts

3

Passion Flower supplements and herbal medicines usually use the dried above-ground parts of Passiflora incarnata L. as tea, powder, tincture, liquid extract, or dry extract. This is not the same identity as passion fruit products made from Passiflora edulis, and different extracts should not be assumed equivalent.

Calming botanical, not a validated cognitive enhancer4
The best human evidence concerns anxiety, situational pre-procedure anxiety, and short-term sleep outcomes. It does not validate focus, attention, memory, productivity, or stimulant-like mental energy.
02

Names, aliases and forms

Latin NamePassiflora incarnata
Common NamesPassionflower; Maypop
Pharmacopeial NamePassiflorae herba
Plant Partaerial parts
03

Mechanisms of action

Mechanism proposals are not clinical proof

4

Laboratory work and reviews discuss GABA-related activity and flavonoids such as vitexin, but a whole-herb preparation contains many constituents. A marker compound or standardized percentage does not by itself establish potency, bioavailability, or equivalence between products.

04

Potential effects and evidence map

Human evidence is relevant but not robust. Small randomized trials include a single preoperative dose assessed over 90 minutes, a 4-week generalized-anxiety pilot, a 7-night passionflower tea study, a 2-week insomnia trial with a modest between-group signal for total sleep time, and a 30-day standardized-extract study for stress and sleep. The 2024 study was small and manufacturer-funded. Preparations and outcomes differ, so the results do not establish a reliable treatment effect, a universal dose, or cognitive-enhancement benefits. NCCIH describes the anxiety and sleep conclusions as not definite and notes mixed sleep-onset and sleep-maintenance findings.

Effect domainMagnitudeGrade
Calm / relaxation4
Acute + cumulativeConfidence: Medium

Small human trials suggest possible calming or anxiety reduction in acute pre-procedure settings and over several weeks, but the studies are too small and heterogeneous for a dependable treatment claim.

Note The 90-minute surgical protocol is an acute situational signal; the 4-week generalized-anxiety study was a small pilot.

2/5
C
Sleep quality8
CumulativeConfidence: Medium

Short studies report possible improvement in subjective sleep quality or total sleep time, while sleep-onset and sleep-maintenance findings remain mixed.

Note Tea and extract studies are not interchangeable, and the objective insomnia signal was modest.

2/5
C
Stress resilience9
CumulativeConfidence: Low

One small 30-day standardized-extract trial reported lower perceived stress, but independent replication is needed.

Note The manufacturer funded the trial and employed two authors.

1/5
C
Focus / attention4
UnknownConfidence: High

No convincing direct human evidence validates Passion Flower as a focus or attention enhancer.

Note Reduced anxiety is not equivalent to improved cognition and sedation may work against daytime performance.

0/5
D
Memory / learning4
UnknownConfidence: High

No convincing direct human evidence validates Passion Flower for memory or learning enhancement.

Note Do not infer cognitive enhancement from broad stress or sleep questionnaires.

0/5
D
05

Typical dosages and timing

Dose context4Form-specific

Trials have used very different preparations, including a one-time 500 mg product before surgery, liquid-extract drops over 4 weeks, tea, and standardized extracts. Those are study protocols, not a universal consumer dose. Compare the exact species, plant part, extract ratio, standardization, serving size, and blend ingredients, then follow the product label or professional advice.

06

Timing & effect horizon

Effect horizonAcute + cumulative
AcuteCumulative
Pre-op dosing6Acute
90 minutes
Study window7Cumulative
7 nights
Study window8Cumulative
2 weeks
Study window9Cumulative
30 days
Acute and cumulative findings should not be merged6

The acute evidence comes from a preoperative protocol that dosed 90 minutes before surgery and assessed anxiety during that interval. Sleep and stress studies followed participants for 7 nights, 2 weeks, or 30 days. These windows do not establish a general onset, peak, effect duration, or half-life for Passion Flower.

07

Safety, side effects and risk profile

Sedation / impairment2
Confidence: High

Drowsiness, dizziness, and confusion are possible. Avoid driving or safety-sensitive work until individual response is known.

Note Sedation was not prominent in every trial, so this is a practical possibility rather than a universal effect.

2/5
C
Interaction risk2
Confidence: Medium

Passionflower can interact with anesthesia or perioperative medicines. Additive sedation with alcohol, sedatives, or other calming products is a reasonable precaution, although individual combinations are not well quantified.

Note Discuss use within 2 weeks of scheduled surgery and check medication combinations with a clinician or pharmacist.

2/5
C
Pregnancy / lactation caution2
Confidence: High

Do not use during pregnancy because passionflower may induce uterine contractions. Breastfeeding safety is not established.

Note This specific high-risk context remains important despite the low overall short-term risk rating for other adults.

4/5
C
Headache / dizziness2
Confidence: High

Dizziness and confusion are recognized possible adverse effects; the available evidence does not support estimating a reliable frequency.

Note The domain name includes headache, but this rating does not claim headache is established.

2/5
C
Evidence uncertainty4
Confidence: High

Most efficacy studies are small, short, and preparation-specific; long-term safety and product equivalence remain uncertain.

Note Tea, liquid extract, dry extract, and blends should not be treated as one standardized intervention.

3/5
C
Overall risk2Low

NCCIH says passionflower may be safe as tea for up to 7 nights and as a daily extract for up to 8 weeks. Possible adverse effects include drowsiness, dizziness, and confusion. That supports a low overall short-term risk rating for many adults, not a risk-free rating or evidence for indefinite use.

Pregnancy and breastfeeding2Avoid

NCCIH advises that passionflower should not be used during pregnancy because it may induce uterine contractions and possibly cause other problems. Breastfeeding safety is not established, so do not self-direct use while breastfeeding.

08

Legal and regulatory status

Regulatory status depends on the market and product3

In the United States, many oral passionflower products are marketed as dietary supplements and are not FDA-approved before sale as drugs. In the European Union, the EMA monograph supports traditional use of specified Passiflora incarnata aerial-part preparations for mild mental stress and to aid sleep; EU Member States consider the monograph when evaluating herbal-medicine applications. The monograph is not an EU-wide approval of every product or disease-treatment claim, and rules elsewhere vary.

09

Practical buying and quality notes

  • Prefer labels that state Passiflora incarnata, the aerial part used, the preparation or extract ratio, serving size, and any standardization. Check every ingredient in sleep blends, and do not compare tea grams directly with tincture drops or extract milligrams.3
10

FAQ

Is Passion Flower a nootropic?

4

Not in the usual focus or memory-enhancement sense. Its human evidence concerns calming, anxiety, and sleep, and drowsiness may be counterproductive for daytime performance.

Does Passion Flower have an acute effect?

6

Possibly in a narrow situational context. One small trial found lower preoperative anxiety after dosing 90 minutes before surgery. That does not establish a universal onset, how long an effect lasts, or the same response with teas, tinctures, extracts, or blends.

Does Passion Flower improve sleep?

8

It may help some short-term sleep outcomes, but the evidence is limited. A tea study found a subjective sleep-quality signal, and a 2-week insomnia trial found a modest total-sleep-time benefit while other measures were mixed.

What is a typical Passion Flower dose?

4

There is no evidence-based universal dose across teas, tinctures, powders, and extracts. Trial amounts are product-specific protocols, so compare the exact preparation and follow the product label or professional guidance rather than converting between forms.

Can Passion Flower be used before surgery?

2

Do not self-direct it before surgery. Even though small trials studied it for preoperative anxiety, NCCIH warns that it may interact with anesthesia or perioperative medicines and advises discussing use within 2 weeks of a scheduled procedure.

Is Passion Flower safe during pregnancy or breastfeeding?

2

Do not use it during pregnancy because it may induce uterine contractions. Breastfeeding safety is not known well enough for self-directed use.

11

References

  1. NCBI Taxonomy. Passiflora incarnata, Taxonomy ID 159425. Accessed 2026-07-14.
  2. National Center for Complementary and Integrative Health. Passionflower: Usefulness and Safety. Last updated April 2025. Accessed 2026-07-14.
  3. European Medicines Agency, Committee on Herbal Medicinal Products. Passiflorae herba: herbal medicinal product summary and Community herbal monograph, Revision 1. 2014. Accessed 2026-07-14.
  4. Janda K, Wojtkowska K, Jakubczyk K, et al. Passiflora incarnata in Neuropsychiatric Disorders-A Systematic Review. Nutrients. 2020;12(12):3894.
  5. Akhondzadeh S, Naghavi HR, Vazirian M, et al. Passionflower in the treatment of generalized anxiety: a pilot double-blind randomized controlled trial with oxazepam. J Clin Pharm Ther. 2001;26(5):363-367.
  6. Movafegh A, Alizadeh R, Hajimohamadi F, Esfehani F, Nejatfar M. Preoperative oral Passiflora incarnata reduces anxiety in ambulatory surgery patients: a double-blind, placebo-controlled study. Anesth Analg. 2008;106(6):1728-1732.
  7. Ngan A, Conduit R. A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata herbal tea on subjective sleep quality. Phytother Res. 2011;25(8):1153-1159.
  8. Lee J, Jung HY, Lee SI, Choi JH, Kim SG. Effects of Passiflora incarnata on polysomnographic sleep parameters in subjects with insomnia disorder: a double-blind randomized placebo-controlled study. Int Clin Psychopharmacol. 2020;35(1):29-35.
  9. Harit MK, Mundhe N, Tamoli S, et al. Randomized, Double-Blind, Placebo-Controlled, Clinical Study of Passiflora incarnata in Participants With Stress and Sleep Problems. Cureus. 2024;16(3):e56530.
Note

This page is informational and summarizes available evidence. It is not medical advice, a recommendation, or a substitute for guidance from a qualified clinician.