Passionflower
Supplement
botanical
sleep
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Sold for anxiety and sleep · not studied extensively
Take with
Taken as a tea or an extract
Pros & cons
Pros
- Small studies: may reduce symptoms of anxiety
- 2020 review of 9 trials saw no adverse effects
- Some evidence for longer total sleep time
Cons
- NCCIH: conclusions are not definite
- Effects on falling and staying asleep are mixed
- Might interact with anaesthesia around surgery
Sources
- NIH NCCIH — Passionflower, promoted uses and how much do we know · read 2026-08-27
what it says
“Today, passionflower is promoted as a dietary supplement for anxiety (including anxiety before surgery), sleep problems, stress, attention-deficit hyperactivity disorder (ADHD), pain, and other conditions … hasn't been studied extensively.”
- NIH NCCIH — Passionflower, what have we learned (anxiety) · read 2026-08-27
what it says
“A small amount of research suggests that oral passionflower might help to reduce symptoms of anxiety and anxiety before a surgical or dental procedure, but conclusions are not definite.”
- NIH NCCIH — Passionflower, what have we learned (sleep) · read 2026-08-27
what it says
“A small amount of research suggests that oral passionflower might improve total sleep time in adults with insomnia, but its effects on the time it takes to fall asleep and stay asleep are mixed.”
- NIH NCCIH — Passionflower, what do we know about safety · read 2026-08-27
what it says
“taken as a tea for up to 7 nights, and the daily use of passionflower extract may be safe for up to 8 weeks … anesthesia … might slow down the nervous system too much.”
- NIH NCCIH — Passionflower, pregnancy and breastfeeding · read 2026-08-27
what it says
“Passionflower should not be used during pregnancy as it may induce uterine contractions and possibly lead to other problems. Little is known about whether it's safe to use passionflower while breastfeeding.”
- Passiflora incarnata in Neuropsychiatric Disorders — A Systematic Review (Janda K, Wojtkowska K, Jakubczyk K, Antoniewicz J, Skonieczna-Żydecka K; Nutrients 2020; PMID 33352740) · read 2026-08-27
what it says
“The systematic review included nine clinical trials … The majority of studies reported reduced anxiety levels … with the effect less evident in people with mild anxiety symptoms. No adverse effects … were observed.”
- HSA — Guidelines on Prohibited and Restricted Ingredients in Health Supplements and Traditional Medicines (Oct 2025), Annex A (118 rows, Abrus to Zinc) and Annex B (4 rows) — both searched, no row for this ingredient · read 2026-08-27
what it says
“The objective of this guideline is to highlight the substances of concern when used in HS and TM and is not meant to be an exhaustive list.”
- HSA Singapore — Health Supplements Guidelines (January 2026), clause 4.8 and Tables 4–5 (vitamins and minerals only) · read 2026-08-27
what it says
“HS for use by the general adult population should not contain vitamins and minerals exceeding the stipulated limits stated in Tables 4 and 5.”
- iHerb Singapore — Herbs > Passion Flower Supplements category page, default order (1 - 19 of 19 results); first 5 distinct brands: California Gold Nutrition, Swanson Vitamins, Nature's Answer, Nutricost, Solaray · read 2026-08-27
what it says
“California Gold Nutrition, Goodnight Sleep … Swanson Vitamins, Full Spectrum® Passion Flower, 500 mg … Nature's Answer, Passionflower Aerial Parts … Nutricost, Passion Flower Extract … Solaray, True Herbs, Passion Flower”
Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.