Passionfruit

Passionfruit (Passiflora edulis Sims): A Comprehensive Reference

1. Identity and Botanical Classification

Scientific and Common Names

The passion fruit is scientifically known as Passiflora edulis, a tropical fruit celebrated for its distinctive, aromatic pulp and unique form. The genus Passiflora, comprising about 500 species, is the largest in the family Passifloraceae. Common names include "passion fruit," "passionfruit," and—particularly in Brazil—"maracujá," where it is frequently used in refreshing juices and cocktails.

There are two common types of passion fruit: the more widespread purple-colored fruit (Passiflora edulis f. edulis) and the yellow-colored fruit (Passiflora edulis f. flavicarpa), which tends to be larger. Though the origin of the yellow passion fruit is unclear, it is believed to have also originated in Amazonian Brazil. In the scientific literature, both forms are studied for their phytochemical and pharmacological properties, though the yellow form (f. flavicarpa) predominates in the juice industry and in many clinical studies.

Nomenclature Note

The name "passion fruit" is distinguished from the broader medicinal herb "passionflower" (Passiflora incarnata), a separate species with its own distinct pharmacological profile. While both belong to the genus Passiflora, the present article focuses on P. edulis as a dietary supplement and natural ingredient. Where evidence specifically pertains to the genus-level or to mechanisms studied in P. incarnata, this is explicitly noted.

Geographical Distribution and Cultivation

It is widely planted in tropical and subtropical regions in several parts of the world, especially in South America, Caribbean, south Florida, South Africa, and Asia. Passion fruit is believed to have originated in the Amazon rainforests of Brazil, where it was first cultivated by indigenous tribes. Brazil is currently the leading producer of passion fruit in the world, with 690,364 tons of production in 2020.

Plant Morphology and Parts Used

Passiflora edulis is a vigorous climbing vine. All major parts of the plant—fruit pulp, seeds, peel (rind), leaves, and stems—have been investigated for their nutritional and medicinal properties. The most cultivated species globally, P. edulis Sims, is widely used in processed foods as well as eaten raw. The fruits are eaten for their pulp together with the seeds; however, the seeds are often discarded when used in processed foods, even though they contain a variety of nutrients and functional components whose industrial use is desirable from the perspective of waste reduction.

Common Forms and Preparations

P. edulis is in great demand as a fresh product or as a formula for food, health care products, or medicines. In commerce and research, the main preparations include:

• Fresh fruit pulp and juice: Consumed directly or as a beverage ingredient.
• Peel flour: Dried and milled rind, studied in clinical trials as a dietary supplement, particularly for its high soluble fiber (pectin) content. The passion fruit peel flour is rich in soluble fiber and has pectin as one of its components.
• Peel extract: Standardized flavonoid-rich extracts, used in randomized clinical trials in encapsulated or tablet form.
• Seed extract: Ethanolic or aqueous extracts enriched in stilbenes, especially piceatannol; investigated for antioxidant, antidiabetic, and skin-related applications. P. edulis seeds contain various types of polyphenols, especially those rich in stilbenes (e.g., piceatannol), and seed extracts and isolated compounds have been reported to exhibit various physiological functions, such as antioxidant effects, improvement of skin condition, fat-burning promotion effects, and hypoglycemic effects.
• Leaf and stem extracts: Used traditionally and investigated pharmacologically for anxiolytic and antidiabetic properties.

2. Traditional and Historical Use

Indigenous Origins

The passion fruit is a widely loved and widely eaten fruit that originated in central South America, and the English name does not come from any aphrodisiacal properties, but from the supposed religious symbolism that the plant bears. The name "passion fruit" has a religious connotation: Spanish missionaries in South America saw the flower of the passion fruit vine as a symbol of the Crucifixion of Christ, and the intricate arrangement of petals and other floral parts was thought to represent elements of the Passion story, hence the name.

The fruit is believed to have been consumed since prehistoric times. In 16th century Peru, the magnificent passion flowers were already regarded as a remedy, and numerous passion flower species are still used in many countries in common therapeutic practices.

Traditional Medicinal Uses Across Cultures

Passion flowers (often the aerial parts and sometimes the fruit) are used throughout the world as anxiolytic, sedative, diuretic, or analgesic.

Passion fruit is high in antioxidants and a good source of nutrients, particularly fibre, vitamin C, and provitamin A. According to a review of the plant's literature, the leaves, flowers, and fruits are used as medicine in many countries.

Passiflora incarnata (and related species within the genus) has been widely used in South America for several centuries, showing effectiveness for sleep, sedation, anxiety, and so on in the civilian population. In South America, the fruit and its various parts have been used in folk medicine for a broad range of indications, including as a mild sedative, for digestive complaints, and for hypertension management. Passiflora incarnata is important in herbal medicine for treating anxiety or nervousness, Generalized Anxiety Disorder (GAD), symptoms of opiate withdrawal, insomnia, neuralgia, convulsion, spasmodic asthma, ADHD, palpitations, cardiac rhythm abnormalities, hypertension, sexual dysfunction, and menopause—a range of indications that reflects the broader traditional knowledge applied to the genus.

A wide range of in vitro and in vivo pharmacological studies have revealed various promising bioactivities of P. edulis, such as antioxidant, antimicrobial, anti-inflammatory, anti-hypertensive, hepatoprotective and lung-protective activities, anti-diabetic, sedative, antidepressant activity, and anxiolytic-like actions. Most of these effects are consistent with those observed for P. edulis in traditional and folk medicine, and these pharmacological actions are thought to be mostly mediated via the existed bioactive components including polyphenol, triterpenes, and polysaccharides.

3. Key Constituents and Active Compounds

Overall Phytochemical Profile

Currently, more than 110 phytochemical constituents have been found and identified from the different plant parts of P. edulis, in which flavonoids and triterpenoids held the biggest share. The major nutrient components of P. edulis include dietary fiber, carbohydrates, lipids, carboxylic acids, polyphenols, volatile compounds, protein and amino acids, vitamins, and minerals.

Flavonoids

Flavonoids represent the most extensively studied class of bioactive compounds in P. edulis. Flavonoids, glycosides, alkaloids, phenolic compounds and volatile constituents have been reported as the major phyto-constituents of the Passiflora species. Compounds identified from the stem include luteolin 6-C-β-D-glucopyranoside, luteolin 6-C-β-D-chinovoside, luteolin 6-C-β-L-fucoside, apigenin 8-C-β-D-glucopyranoside, and apigenin-6-C-β-D-glucopyrano-4′-O-α-L-rhamnopyranoside. C-glycosyl flavonoids—including vitexin, isovitexin, orientin, and isoorientin—are among the most pharmacologically relevant. These bioactive compounds, such as C-glycosyl flavonoids vicenin, orientin, isoorientin, vitexin, and isovitexin, have been attributed with anti-inflammatory activity.

It has been suggested that flavonoids may be partly responsible for the neuropharmacological activity of these plants. An aqueous extract of P. edulis Sims presented an anxiolytic-like activity without any significant effect upon the motor activity, whilst through fractionation it was possible to isolate and characterize luteolin-7-O-[2-rhamnosylglucoside], which showed an anxiolytic-like activity without compromising motor activity.

Triterpenoids

Triterpenoids constitute the second-largest phytochemical class in P. edulis. Useful chemical constituents include volatile oils, flavonoids, lipids, triterpenoids, aldehydes, ketones, tridecanone, palmitic acid, stearic acid, linoleic acid, quercetin, apigenin, and vitexin.

Piceatannol (Stilbene)

Passiflora edulis (passion fruit) seed waste, an abundant by-product of the juice industry, is a promising source of piceatannol (PIC), a hydroxystilbene with superior antioxidant activity compared to resveratrol. Preclinical studies demonstrate that PIC exerts multi-target effects relevant to skin aging and acne, including ROS scavenging, anti-inflammatory activity via NF-κB/MAPK inhibition, suppression of melanogenesis, enhancement of hyaluronic acid and collagen synthesis, and antibacterial action against Cutibacterium acnes. However, clinical data are limited and methodologically inconsistent.

Carotenoids

Passion fruits are rich in bioactive compounds such as carotenoids (β-carotene, lutein), polyphenols (gallic acid, piceatannol, neochlorogenic acid), and flavonoids. In P. edulis fruits, 13 carotenoids and six sulforaphanes have been discovered and extracted. The lyophilized pulp has been shown to contain β-carotene (89.61 ± 0.04 μg/g) and lycopene (48.81 ± 0.03 μg/g).

Amino Acids, Organic Acids, and Sugars

Analyses have identified 14 amino acids (including leucine, valine, threonine, alanine, isoleucine, lysine, methionine, phenylalanine, aspartate, and tryptophan), 7 sugars (glucose, sucrose, fructose, mannitol, maltose, melibiose, trehalose), 6 organic acids (tartaric, succinic, malic, citric, shikimic, and malonic acids), as well as choline, chlorogenic acid, phenylacetic acid, vitamin C, carotenoids, cis-resveratrol, naringenin, kaempferol-3-glycoside, myricetin, and procyanidin-B1.

Cyanogenic Glycosides

A total of 65 metabolites have been characterized in P. edulis extracts including O-flavonoids, C-flavonoids, cyanogenic glycosides, and fatty acids. Five mandelonitrile glycosides have been detected in the glycosidic fraction isolated from several Passiflora fruits, including prunasin, sambunigrin, and amygdalin, with amygdalin reported for the first time as a passion fruit component. Prunasin was found to be the most important cyanogenic glycoside in peel (285 mg/kg for P. edulis f. flavicarpa), whereas amygdalin (31 mg/kg for P. edulis) and other compounds were mostly found in the juice (99 mg/kg for P. edulis f. flavicarpa).

Dietary Fiber (Pectin)

The peel of P. edulis is notably rich in pectin, a soluble dietary fiber. Pectin is a soluble fiber widely used as an ingredient in pharmaceutical preparations as an antidiarrheal and detoxifying substance. Furthermore, it reduces glucose intolerance in diabetic patients and decreases serum cholesterol and triglyceride levels by forming a gel which prevents the absorption of cholesterol and glucose derived from the diet.

4. Mechanisms of Action

GABAergic Modulation (Anxiolytic/Sedative Effects)

Passiflora (passionflower), traditionally used for anxiety and insomnia, is primarily known for GABAergic modulation, though evidence suggests broader neuropharmacological actions. The mechanism of action is believed to involve the modulation of the γ-aminobutyric acid (GABA) system, as Passiflora flavonoids act as partial agonists of GABA-A receptors and inhibit the uptake of [³H]-GABA into rat cortical synaptosomes.

The first evidence was shown that numerous pharmacological effects of Passiflora are mediated via modulation of the GABA system, including affinity to GABA-A and GABA-B receptors, and effects on GABA uptake. Harman-type alkaloids found in P. incarnata were not detected in P. edulis ethanol extract or any of its fractions, suggesting that they do not mediate the CNS modulating effects of P. edulis. The aerial part of Passiflora edulis f. flavicarpa is anxiolytic at low dose but sedative at high dose. Flavonoids are important active constituents, and there are likely other components responsible for the anxiolytic effect besides flavonoids.

Non-GABAergic Neurobiological Mechanisms

Thirteen studies have revealed diverse non-GABAergic actions of Passiflora. It modulates opioidergic and nicotinic cholinergic systems (relevant to analgesia), monoaminergic pathways (affecting dopamine, norepinephrine, serotonin), and the glutamate system. This multi-target profile likely contributes to its clinical efficacy in conditions like anxiety, pain, and stress, potentially with a favorable side-effect profile.

Antihypertensive Effects: Nitric Oxide Modulation

The passion fruit peel (PFP) extract, a novel mixture of bioflavonoids, is hypothesized to attenuate the development of hypertension through nitric oxide (NO) modulation. In spontaneously hypertensive rats, oral administration of P. edulis peel extract decreased blood pressure, serum nitric oxide levels, and hemodynamic parameters. Polyphenols including luteolin, luteolin-6-C-glucoside, quercetin, ascorbic acid, piceatannol, and anthocyanin may be responsible, as they have strong vascular effects and can facilitate nitric oxide regulation.

Antidiabetic Effects: Enzyme Inhibition and Fiber Mechanisms

The ethanolic extract of seeds of Passiflora edulis (PESE) and piceatannol (PIC) have been investigated for antidiabetic potential. PESE, PIC, and acarbose (ACB) exhibited IC₅₀ for alpha-amylase of 32.1 ± 2.7, 85.4 ± 0.7, and 0.4 ± 0.1 µg/mL, respectively, and IC₅₀ for alpha-glucosidase of 76.2 ± 1.9, 20.4 ± 7.6, and 252 ± 4.5 µg/mL, respectively. These figures indicate that PESE is a more potent alpha-glucosidase inhibitor than the pharmaceutical drug acarbose in vitro, though this has not yet been replicated in clinical trials. A preclinical study using passion fruit husk fiber in the diet of normal and diabetic rats showed a reduction in blood glucose after four weeks of feeding. This effect was attributed to the action of soluble fiber on glucose absorption in the gastrointestinal tract and increased insulin secretion.

Antioxidant Mechanisms

Passion fruits are rich in bioactive compounds such as carotenoids (β-carotene, lutein), polyphenols (gallic acid, piceatannol, neochlorogenic acid), and flavonoids. These natural phytochemicals and bioactive substances have gained attention for their antioxidant properties and potential health benefits. Carotenoids are classified as carotenes if they are exclusively hydrocarbons, and xanthophylls if they contain oxygen. The core system of conjugated carbon–carbon double bonds makes them efficient quenchers of reactive oxygen species (ROS) and absorbers of potentially damaging visible light.

Anti-Inflammatory Mechanisms

Passion fruits exhibit anti-inflammatory properties, which can be beneficial against chronic diseases such as heart disease and diabetes. Passion fruit peel flour has been shown to reduce pro-inflammatory cytokine TNF-α, IL-1β, IL-6, IL-12, and IL-17 expression and decreased the expression of MCP-1 and ICAM-1.

Skin and Melanogenesis Mechanisms

The concentration of polyphenols is higher in passion fruit seeds than in the rind or pulp. Treatment of melanoma cells with passion fruit seed extract led to inhibition of melanogenesis. In addition, the production of total soluble collagen was elevated in dermal fibroblast cells cultured with the seed extract. The rind and pulp did not yield these effects, and removal of polyphenols from the seed extract abolished the effects. The major compound responsible was identified as piceatannol (3,4,3′,5′-tetrahydroxy-trans-stilbene).

5. Scientific Evidence by Area of Use

5.1 Anxiety and CNS / Sedative Effects

Evidence level: Primarily preclinical (animal and in vitro); limited human clinical data specifically for P. edulis.

The passionflower (Passiflora incarnata) is a perennial plant with documented therapeutic properties. The literature data suggest that the passionflower itself, as well as its preparations, helps reduce stress and can therefore be helpful in the treatment of insomnia, anxiety, and depression. This evidence base is strongest for P. incarnata and applies to P. edulis by extension from genus-level studies, though important mechanistic differences exist between the two species.

For P. edulis specifically, preclinical work has demonstrated clear anxiolytic and sedative properties. Research evaluating the anxiolytic/sedative activity of an aqueous extract of Passiflora edulis Sims using the elevated plus-maze model of anxiety found that the aqueous extract presented an anxiolytic-like activity without any significant effect upon the motor activity. The aerial part of Passiflora edulis f. flavicarpa was anxiolytic at low dose but sedative at high dose in animal models. These are animal studies and cannot be directly extrapolated to clinical efficacy in humans.

5.2 Cardiovascular Effects: Blood Pressure

Evidence level: Small randomized controlled trials (RCTs) showing positive signals; sample sizes limit generalizability.

Oral administration of P. edulis peel extract reduced hemodynamic parameters, decreased serum nitric oxide levels, and lowered blood pressure in spontaneously hypertensive rats.

A key human trial: The clinical efficacy of purple passion fruit peel extract (a flavonoid-rich dietary supplement) in reducing cardiovascular risk factors in adult type 2 diabetic subjects was investigated in a randomized, double-blind, placebo-controlled trial. Forty-one subjects were randomly assigned to receive a daily dose of purple passion fruit extract (220 mg) or a matched placebo for 16 weeks. Body mass index, blood pressure, fasting and postprandial blood glucose, glycated hemoglobin, and lipid profile were determined at baseline and at monthly intervals. A significant reduction in systolic blood pressure and fasting blood glucose was observed (P < .05). Purple passion fruit was well tolerated, and no adverse events were reported. However, no significant changes in cholesterol and triglycerides were observed.

An earlier combined animal-and-human study by Zibadia et al. (2007) explored hypertension using the same peel extract formulation, providing mechanistic support via NO modulation; however, detailed human trial data from this study remain limited in the publicly available literature.

5.3 Glycemic Control and Antidiabetic Effects

Evidence level: Positive signals from small clinical trials (peel flour, 30 g/day); in vitro enzyme inhibition data are preliminary; translation to clinical outcomes remains incomplete.

A total of 43 type 2 diabetes volunteers (28 females and 15 males) ingested 30 g/day of the yellow passion fruit peel flour for two months. The levels of blood glucose and fasting insulin, HOMA index, and glycated hemoglobin were measured before and after dietary supplementation. There was a significant difference in fasting blood glucose values (P = 0.000) and glycated hemoglobin (P = 0.032) after supplementation.

A clinical toxicological assay of this flour performed with a daily intake of 30 g showed no acute or subchronic toxicity, suggesting its use as a dietary supplement.

A pilot clinical study showed that treatment with passion fruit peel flour (P. edulis fo. flavicarpa) resulted in decreased cholesterol levels in women between 30 and 60 years of age who had hypercholesterolemia (cholesterol ≥ 200 mg/dL).

In vitro, the inhibition of alpha-amylase, alpha-glucosidase, and DPP-4 enzymes as well as antioxidant and antiglycation activities found in seed extract warrants further investigation of the antidiabetic potential of P. edulis seeds. PESE and piceatannol inhibited the formation of advanced glycation end-products (AGE) and also inhibited the formation of β-amyloid fibrils in vitro up to 100%. These in vitro findings are mechanistically interesting but have not yet been translated into clinical trials.

Although the use of P. edulis has a key role in the management of various ailments in folk medicine and in various preclinical experiments, the efficacy of this plant has not been explored in depth in human clinical trials. So far, few clinical trials of P. edulis have been conducted to determine improved outcomes in chronic diseases such as diabetes, hypertension, and asthma.

5.4 Musculoskeletal: Osteoarthritis

Evidence level: Single small RCT; preliminary, requires replication.

Thirty-three osteoarthritis (OA) patients were enrolled in a randomized, double-blind, placebo-controlled trial with parallel-group design. Patients received either placebo or passion fruit peel (PFP) pills (150 mg, daily) in a double-blinded fashion for 2 months. OA clinical symptoms were evaluated monthly with the Western Ontario and McMaster Universities (WOMAC) Osteoarthritis Index. In the PFP group, there was a significant improvement in total WOMAC score and physical function after 30 days, and pain after 60 days. At 60 days, reductions of 18.6%, 18%, 19.6%, and 19.2% in pain, stiffness, physical function, and composite WOMAC score, respectively, were self-reported in the PFP group. This was a small, single trial and the findings require confirmation in larger studies.

5.5 Lipid Profile and Hyperlipidemia

Evidence level: Preclinical (animal) data show positive effects; human clinical evidence is limited and mixed.

Passion fruit juice at a dose of 580 mg/kg once a day for 30 consecutive days significantly reduced total cholesterol, triglyceride, and low-density lipoprotein cholesterol levels, and increased high-density lipoprotein cholesterol level in diabetic Wistar rat offspring. Several studies have reported that the genus Passiflora has been used as an aid in the treatment or control of diabetes, mainly due to the presence of soluble fibers such as pectin. In the human trial by Naga Raju et al. (2013), no significant changes in cholesterol or triglycerides were observed at the 220 mg peel extract dose over 16 weeks.

5.6 Antioxidant and Anti-Inflammatory Activities

Evidence level: Predominantly in vitro and animal data; no dedicated human trials on antioxidant endpoints as a primary outcome.

Currently, more than 110 phytochemical constituents have been found and identified from the different plant parts of P. edulis, in which flavonoids and triterpenoids held the biggest share. Various extracts, fruit juice, and isolated compounds showed a wide range of health effects and biological activities such as antioxidant, anti-hypertensive, anti-tumor, antidiabetic, and hypolipidemic activities.

5.7 Skin Health and Anti-Aging (Dermatological Applications)

Evidence level: Preclinical (cell culture) only; clinical evidence is absent or insufficient as of the time of this writing.

Passion fruit rind extract demonstrated anticancer potential against Ca9-22 oral carcinoma cells by inhibiting cell survival, migration, and proliferation and inducing apoptosis. These results underscore the potential of P. edulis rind as a promising candidate for anti-skin aging, antibacterial, and anticancer applications, meriting further therapeutic investigation. These findings are in vitro and should not be interpreted as evidence of clinical efficacy.

5.8 Hepatoprotective and Lung-Protective Effects

Evidence level: Animal (preclinical) only.

In a pulmonary fibrosis model in C57BL/6J mice induced by bleomycin, administration of passion fruit peel extract significantly reduced loss of body weight and mortality rate, decreased the count of inflammatory cells, macrophages, lymphocytes, and neutrophils, reduced MPO activity, and restored bleomycin-induced depletion of SOD activity. These results are preclinical and require human validation.

6. Body Systems Associated

• Central nervous system: Anxiolytic, sedative, and potential antidepressant effects via GABAergic and monoaminergic pathways.
• Cardiovascular system: Antihypertensive effects (nitric oxide modulation, bioflavonoid-mediated vasodilation); preliminary evidence for lipid modulation.
• Endocrine/Metabolic system: Antidiabetic effects via enzyme inhibition (alpha-glucosidase, DPP-4) and fiber-mediated slowing of glucose absorption.
• Musculoskeletal system: Anti-inflammatory benefit in osteoarthritis (one human RCT).
• Integumentary system (skin): Antioxidant, anti-melanogenic, and pro-collagen effects attributed to piceatannol (preclinical data).
• Hepatic and pulmonary systems: Hepatoprotective and lung-protective effects demonstrated in animal models.
• Gastrointestinal system: Pectin-rich peel fiber supports digestive health and glucose/cholesterol absorption modulation.

7. Dosage Forms and Doses Reported in Studies

The following dosages are those specifically reported in the cited clinical or preclinical studies:

• Purple passion fruit peel extract (encapsulated/tablet), cardiovascular/antidiabetic use: Forty-one subjects received a daily dose of purple passion fruit peel extract (220 mg) or a matched placebo for 16 weeks.
• Purple passion fruit peel extract (encapsulated), osteoarthritis: Patients received either placebo or PFP pills (150 mg, daily) in a double-blinded fashion for 2 months.
• Yellow passion fruit peel flour, glycemic control: A total of 43 type 2 diabetes volunteers ingested 30 g/day of the yellow passion fruit peel flour for two months.
• Clinical toxicological assessment: A clinical toxicological assay of this flour performed with a daily intake of 30 g showed no acute or subchronic toxicity.
• Animal studies (passion fruit juice): Oral administration of passion fruit juice at a dose of 580 mg/kg once a day for 30 consecutive days significantly reduced glucose in streptozotocin-induced diabetic rat offspring.

Researching the pharmacokinetics (absorption, distribution, metabolism, and excretion) of passion fruit peel extracts in animal models and humans would be important for determining optimal dosage regimens. Understanding how the body processes these extracts can guide dosage recommendations for potential clinical applications. No universally validated dosing guidance has been established for passionfruit as a supplement.

8. Safety Considerations and Interactions

General Safety

Daily consumption of passion fruit at common doses is non-toxic and safe. This statement pertains to the whole fruit consumed in typical dietary quantities. The toxicological profile of concentrated extracts or supplemental forms requires separate consideration.

Cyanogenic Glycosides

The pulp of passion fruit contains cyanogenic glycosides, which are natural plant toxins present in several species. Unripe passion fruits contain the highest concentration of cyanide glycosides, losing most of their toxicity as they mature. When ingested, cyanogenic glycosides interact with digestive enzymes, releasing hydrogen cyanide, which is poisonous in significant amounts. Prunasin was found to be the most important cyanogenic glycoside in peel (285 mg/kg for P. edulis f. flavicarpa). Commercially ripened fruit and standardized extracts used in clinical trials have been found safe in the doses studied, but the raw peel of unripe fruit carries a higher risk profile.

Pregnancy and Lactation

Use of passion flower is contraindicated during pregnancy because of the uterine stimulant action of its alkaloids harman and harmaline, as demonstrated in animal models and in vitro studies, and the content of the cyanogenic glycoside gynocardin. Information regarding use during lactation is lacking.

Drug Interactions: CNS Agents

Caution is warranted with co-administration of CNS-active medicines; an additive effect with St. John's wort has been suggested. People taking antihypertensive drugs, as well as those consuming sedatives and anxiolytics, must be aware that consuming passion fruit in excess or in remedial forms can potentiate the effects of those medications.

Drug Interactions: Anticoagulants

Case reports are lacking regarding interactions with warfarin and other anticoagulants; however, compounds identified from P. edulis extracts have exhibited anticoagulant activity in vitro. Therefore, there is theoretically an increased risk for prolonged bleeding with co-administration of passion fruit preparations and anticoagulants.

Drug Interactions: QT Interval

Caution is warranted with co-administration of drugs that prolong the QT interval.

Tolerability in Reported Trials

Purple passion fruit was well tolerated and no adverse events were reported in the 16-week RCT in type 2 diabetic subjects. These findings are specific to the doses and populations studied in that trial.

9. Research Gaps and Current Limitations

Although the use of P. edulis has a key role in the management of various ailments in folk medicine and in various preclinical experiments, the efficacy of this plant has not been explored in depth in human clinical trials. So far, few clinical trials of P. edulis have been conducted.

The translation of piceatannol into a skin-targeted ingredient remains hindered by a lack of standardization and clinical validation. Clinical data are limited and methodologically inconsistent.

Further research, including mechanistic studies and clinical trials with relevant biomarkers, is needed to fully elucidate the complex pharmacology of Passiflora species. The majority of the pharmacological evidence for P. edulis remains at the in vitro or animal model stage. Small sample sizes, lack of dose standardization, and varying extraction methods limit the clinical conclusions that can be drawn from existing human trials. Larger, well-powered, independently replicated RCTs are needed across all therapeutic areas.

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