# Passiflora incarnata

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/passiflora-incarnata
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-02
**Evidence Score:** 2 / 10
**Category:** European
**Also Known As:** Passion flower, Passionflower, Purple passion flower, Wild passion flower, Maypop, Apricot vine, Passiflora, Incarnata, Wild apricot, Passion vine

## Overview

Passiflora incarnata, commonly called passionflower, contains flavonoids including chrysin and vitexin as primary bioactive compounds that interact with GABA-A receptors to produce anxiolytic and sedative effects. It is listed in multiple European pharmacopoeias as a traditional herbal remedy for mild anxiety and sleep disturbances.

## Health Benefits

• Relieves mild nervous tension including restlessness and irritability (Traditional use evidence based on 30+ years of European medicinal use)
• Supports temporary sleep disturbances (Traditional use evidence, not supported by RCTs)
• May help with mild anxiety symptoms (Traditional use only, no clinical trials provided)
• Historically used for [nervous system support](/ingredients/condition/stress) (Traditional evidence from EU Member States documentation)
• Potential sedative effects for relaxation (Traditional use, mechanism unelucidated)

## Mechanism of Action

The flavonoid chrysin in Passiflora incarnata acts as a partial agonist at benzodiazepine-binding sites on GABA-A receptors, enhancing inhibitory GABAergic neurotransmission without full benzodiazepine-like sedation. Vitexin and isovitexin may additionally inhibit monoamine oxidase (MAO) activity and modulate [serotonin reuptake](/ingredients/condition/mood), contributing to anxiolytic effects. Some research also suggests that passionflower alkaloids such as harmane and harmol exert mild beta-carboline activity, further potentiating central nervous system depression.

## Clinical Summary

A small randomized controlled trial (n=36) published in Phytotherapy Research (2001) compared Passiflora incarnata extract to oxazepam for generalized anxiety disorder, finding comparable anxiolytic efficacy over 4 weeks with fewer impairment-related side effects in the passionflower group. A 2011 pilot RCT (n=41) reported significant reduction in preoperative anxiety compared to placebo using a single oral dose of 500 mg extract. Evidence supporting sleep improvement remains primarily observational or based on traditional use, with no large-scale RCTs confirming efficacy for [insomnia](/ingredients/condition/sleep) endpoints. Overall, evidence quality is low-to-moderate; European Medicines Agency (EMA) classifies its use as 'traditional use' rather than 'well-established use,' meaning robust clinical validation is still lacking.

## Nutritional Profile

Passiflora incarnata (aerial parts) contains minimal macronutrient contribution at typical therapeutic doses (300–400mg dry extract). Primary bioactive compounds include flavonoids (0.8–2.5% total flavonoid content per EMA monograph standards), predominantly chrysin, vitexin, isovitexin, orientin, and isoorientin — with vitexin and isovitexin considered the primary marker compounds for standardization. Alkaloids are present at trace levels (<0.1%), including harmane, harmine, and harmaline (beta-carboline alkaloids), though concentrations are too low for significant MAO-inhibitory activity at standard doses. Maltol (a pyranone compound) has been identified as a potential sedative contributor, though its concentration varies widely by extraction method. Amino acid gamma-aminobutyric acid (GABA) precursors are present but bioavailability via oral supplementation remains debated. The plant contains negligible protein, fat, and fiber at extract-level dosing. Flavonoid bioavailability is moderate; chrysin has notably poor oral bioavailability (~1%) due to rapid hepatic [metabolism](/ingredients/condition/weight-management), whereas glycosylated flavonoids (vitexin, orientin) show somewhat improved absorption. Aqueous and hydroethanolic extracts demonstrate superior flavonoid yield compared to dry powder forms.

## Dosage & Preparation

Comminuted/powdered herb: 0.5-2.5g daily as herbal tea. Liquid extract (DER 1:8, 65% ethanol): 2.5-5ml, 2-3 times daily or 10ml single dose at bedtime. Dried extracts: equivalent to 1-8g dried herb top per day. For adults and adolescents over 12 years only. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Passiflora incarnata is generally well tolerated at standard doses (300–800 mg dry extract daily), with mild side effects including drowsiness, dizziness, and occasional nausea reported in clinical studies. It potentiates the effects of CNS depressants including benzodiazepines, barbiturates, opioids, and alcohol due to additive GABAergic activity, and co-administration should be avoided or closely supervised. The harmala alkaloids present in trace amounts carry theoretical MAO-inhibiting potential, warranting caution when combined with serotonergic drugs or tyramine-rich foods, though clinically significant interactions at typical supplement doses are not well documented. Use during pregnancy and lactation is contraindicated based on the presence of alkaloids with potential uterine-stimulating activity and insufficient safety data.

## Scientific Research

The EMA/HMPC classifies P. incarnata under traditional use rather than well-established use, indicating insufficient clinical evidence for full marketing authorization. No randomized controlled trials, meta-analyses, or specific PMIDs are detailed in the assessment, with the report noting limited clinical safety data from post-marketing surveillance only.

## Historical & Cultural Context

Passion flower has been used in European traditional medicine for at least 30 years preceding EMA assessment (pre-1984) for nervous tension and sleep support. Historical data from EU Member States confirm medicinal use through approved products and inclusion in traditional combinations like Species sedativae.

## Synergistic Combinations

Passiflora incarnata pairs effectively with Valeriana officinalis, as valerian's valerenic acid modulates GABA-A receptors while passionflower's flavonoids (particularly chrysin) exert additional GABAergic binding activity — producing additive anxiolytic and sleep-onset effects along complementary but distinct receptor pathways; this combination is supported by at least one randomized trial showing improved [sleep quality](/ingredients/condition/sleep) versus either herb alone. Lemon balm (Melissa officinalis), rich in rosmarinic acid and luteolin, complements passionflower by inhibiting GABA transaminase (increasing synaptic GABA availability) while also modulating [acetylcholine](/ingredients/condition/cognitive) receptors, creating a multi-target calming effect relevant to both anxiety and irritability. Magnesium glycinate or magnesium bisglycinate (200–400mg elemental Mg) stacks well as a cofactor that supports GABA receptor sensitivity and reduces HPA-axis [cortisol](/ingredients/condition/stress) output, amplifying passionflower's nervous system calming properties — particularly for sleep disturbance where magnesium deficiency is a common compounding factor.

## Frequently Asked Questions

### What is the recommended dosage of passionflower for anxiety?

Clinical studies and European pharmacopoeia guidelines typically use 300–400 mg of standardized dry extract (standardized to 2–3% total flavonoids as vitexin) taken two to three times daily for anxiety. For sleep support, a single dose of 300–500 mg is taken 30–60 minutes before bedtime. Doses above 800 mg/day have not been well studied and are not recommended without medical supervision.

### Can passionflower be taken with melatonin or other sleep supplements?

Combining passionflower with melatonin is generally considered low-risk since they act via distinct mechanisms — passionflower modulates GABA-A receptors while melatonin acts on MT1/MT2 receptors in the suprachiasmatic nucleus. However, additive sedation is possible, and caution is advised when combining with other CNS-active ingredients such as valerian, L-theanine, or 5-HTP. No formal interaction studies exist for these combinations, so starting with lower individual doses is prudent.

### How long does passionflower take to work?

Acute anxiolytic effects may occur within 30–90 minutes of oral ingestion, consistent with the pharmacokinetic profile of flavonoid absorption and GABA-A receptor engagement observed in the 2001 Dhawan et al. animal studies. The preoperative anxiety RCT (Movafegh et al., 2008) using 500 mg extract demonstrated significant anxiety reduction within 90 minutes of a single dose. Sustained benefits for general anxiety or sleep disturbances likely require consistent use over 2–4 weeks based on available trial durations.

### Is passionflower safe for long-term use?

Long-term safety data beyond 8 weeks are limited, as most clinical trials have short durations. The EMA's traditional use designation requires a minimum of 30 years of historical use without documented serious harm, which provides indirect support for reasonable tolerability. Rare cases of hepatotoxicity and vasculitis have been reported in case studies, though causality was not firmly established; periodic breaks from use (e.g., cycling off after 6–8 weeks) are commonly recommended by herbal medicine practitioners.

### Does passionflower cause dependence or withdrawal?

Unlike classic benzodiazepines, passionflower's partial agonism at GABA-A benzodiazepine sites is considered to carry a significantly lower dependence risk, and no clinical cases of physical dependence or withdrawal syndrome attributable to Passiflora incarnata alone have been documented in the literature. Animal studies using chrysin have not demonstrated the tolerance development seen with full benzodiazepine agonists. Nevertheless, psychological reliance on any sleep or anxiety supplement is theoretically possible, and abrupt discontinuation after prolonged high-dose use should be done gradually as a precaution.

### Is passionflower safe during pregnancy and breastfeeding?

Passionflower is not recommended during pregnancy due to insufficient safety data and traditional use suggesting uterine stimulant properties. Breastfeeding mothers should also avoid passionflower as it may pass into breast milk, and safety in nursing infants has not been established. Consult with a healthcare provider before use if pregnant or breastfeeding.

### Does passionflower interact with prescription medications like benzodiazepines or SSRIs?

Passionflower may have additive CNS depressant effects when combined with benzodiazepines, sedatives, or other central nervous system depressants, potentially increasing drowsiness or sedation. While direct interactions with SSRIs are not well-documented, caution is advised due to passionflower's effects on the nervous system. Always inform your healthcare provider if taking prescription medications before adding passionflower supplements.

### What is the quality of clinical evidence supporting passionflower's effectiveness?

Passionflower's traditional use for nervous tension and sleep support is based on 30+ years of European medicinal use rather than robust randomized controlled trials (RCTs). Most current evidence for anxiety and sleep benefits remains preliminary or relies on traditional use documentation rather than modern clinical research. Higher-quality clinical trials would be needed to definitively establish efficacy compared to placebo or pharmaceutical alternatives.

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