What is it?
Identity matters: this page is about Passiflora incarnata aerial parts
3Passion 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.
Anxiety findings are promising but small and context-specific
6A 60-person trial used one 500 mg product dose 90 minutes before surgery and reported lower anxiety without more sedation. A separate 36-person generalized-anxiety pilot used a liquid extract for 4 weeks. These studies support a possible signal, not equivalence to prescription treatment or a universal protocol.
Sleep evidence is modest and mixed
8A 7-night tea study reported a subjective sleep-quality signal. In a 2-week insomnia trial, total sleep time improved versus placebo, but sleep efficiency and wake-after-sleep-onset improvements did not differ between groups. NCCIH therefore describes total-sleep-time evidence as limited and sleep-onset or sleep-maintenance findings as mixed.
A newer 30-day extract trial still needs independent replication
9A 65-person randomized trial of a standardized aerial-part extract reported lower perceived stress and more self-reported total sleep time after 30 days. There were no reported adverse events. The study was small, the manufacturer funded it, and two authors were manufacturer employees; independent replication is needed.
Names, aliases and forms
Mechanisms of action
Mechanism proposals are not clinical proof
4Laboratory work and reviews propose effects on GABA, a chemical messenger involved in slowing nerve activity, and discuss plant compounds such as vitexin. These proposals do not prove a clinical effect. A standardized marker percentage does not by itself establish potency or equivalence between whole-herb products.
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.
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.
Short studies report possible improvement in subjective sleep quality or total sleep time, while sleep-onset and sleep-maintenance findings remain mixed.
One small 30-day standardized-extract trial reported lower perceived stress, but independent replication is needed.
No convincing direct human evidence validates Passion Flower as a focus or attention enhancer.
No convincing direct human evidence validates Passion Flower for memory or learning enhancement.
Typical dosages and timing
Studies have used a one-time 500 mg product before surgery, liquid-extract drops over 4 weeks, tea, and standardized extracts. These are preparation-specific trial protocols, not a universal consumer dose. Extract milligrams, tea grams, and tincture drops cannot be converted into equivalent doses without preparation data.
Timing & effect horizon
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.
Safety, side effects and risk profile
Drowsiness, dizziness, and confusion are possible. Avoid driving or safety-sensitive work until individual response is known.
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.
Do not use during pregnancy because passionflower may induce uterine contractions. Breastfeeding safety is not established.
Dizziness and confusion are recognized possible adverse effects; the available evidence does not support estimating a reliable frequency.
Most efficacy studies are small, short, and preparation-specific; long-term safety and product equivalence remain uncertain.
NCCIH describes short-term oral tea and extract use as possibly safe and lists drowsiness, dizziness, and confusion as possible adverse effects. These can matter for driving or safety-sensitive tasks, so minimal risk would understate the practical impairment concern. Low overall risk applies to generally healthy adults over short studied periods; the available trials do not establish a common serious hazard or safety with indefinite use.
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.
Interactions and cautions
Passionflower may interact with anesthesia or other medicines used before and after surgery and may slow the nervous system too much. Tell the surgical team about use and discuss any use within 2 weeks of a scheduled procedure.
Because drowsiness is possible, additive impairment with alcohol, sedatives, sleep medicines, sedating antihistamines, opioids, or other calming products is a reasonable precaution. Evidence does not quantify every combination, so a pharmacist or clinician should review the exact medicines and product rather than assuming all combinations are either safe or dangerous.
Legal and regulatory status
As of October 2026, the European Medicines Agency lists a traditional-use monograph for specified Passiflora incarnata aerial-part preparations for mild mental stress and to aid sleep. EU Member States evaluate herbal-medicine applications; the monograph is not an EU-wide approval of every passionflower product. The closed 2025 call for data is a periodic-review consultation, not a new final monograph. National rules and rules outside the EU can differ.
As of October 2026, U.S. oral herbal products may be marketed as dietary supplements depending on their ingredients and intended use. FDA does not approve dietary supplements before sale. Supplement marketing status is not FDA confirmation of efficacy or approval as a drug.
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
- Compare price per gram for matching powder preparations, or price per capsule and the declared extract amount for matching capsules. Tea, tinctures, and different extract ratios need separate comparisons. Verify package size and final merchant price, including shipping; a zero or implausible normalized price needs verification before it can support a buying decision.3
FAQ
Is Passion Flower a nootropic?
4Not 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?
6Possibly 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.
How long has Passion Flower been studied, and is a cycle established?
4Sleep studies followed participants for 7 nights or 2 weeks, and a stress-and-sleep extract trial lasted 30 days. These are observation windows, not proof of effect duration or recommended cycle lengths. The cited evidence does not establish a standard consumer cycle; long-term safety remains uncertain.
What is a typical Passion Flower dose?
4There 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?
2Do 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?
2Do not use it during pregnancy because it may induce uterine contractions. Breastfeeding safety is not known well enough for self-directed use.
References
- NCBI Taxonomy. Passiflora incarnata, Taxonomy ID 159425. Accessed 2026-07-14.
- National Center for Complementary and Integrative Health. Passionflower: Usefulness and Safety. Last updated April 2025. Accessed 2026-10-19.
- European Medicines Agency, Committee on Herbal Medicinal Products. Passiflorae herba: herbal medicinal product summary and Community herbal monograph, Revision 1. 2014. Accessed 2026-10-19.
- Janda K, Wojtkowska K, Jakubczyk K, et al. Passiflora incarnata in Neuropsychiatric Disorders-A Systematic Review. Nutrients. 2020;12(12):3894.
- 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.
- 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.
- 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.
- 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.
- 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.