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Ingredient guide

How much passionflower per day?

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

No official daily amount exists for passionflower. The sleep tea trial used 2 g of dried herb in 250 mL of water each evening for a week, an extract trial used 600 mg at bedtime for 30 days, and procedure trials gave 260 to 700 mg once. NCCIH says daily extract may be safe for up to 8 weeks.1,2,3,4

Key facts

  • Liquid extract trials used 40 to 45 drops a day.1
  • NCCIH says passionflower tea may be safe for up to 7 nights.4
  • The trials in one review lasted from a single day to 30 days.1
  • Most trials did not say which parts of the plant their product used.1

The amounts used in studies

Passionflower amounts in human studies1,2,3
UseFormAmountHow long
Sleep quality, 41 healthy adultsTea2 g of dried herb in 250 mL of water, each evening7 days
Sleep and stress, 65 adultsExtract capsules600 mg at bedtime30 days
Before dental surgeryTablet260 mg once, 30 minutes beforeSingle dose
Before spinal anesthesiaSyrup700 mg once, 30 minutes beforeSingle dose
Before surgeryTablet500 mg onceSingle dose
Daily use, two trialsLiquid drops40 to 45 drops a dayUp to 28 days

Trials before surgery or dental work gave single doses of 260 to 700 mg, often about 30 minutes beforehand.1

The procedure trials are listed for completeness only. NCCIH advises against using passionflower before surgery unless a health care provider recommends it, because it might add to the effects of anesthesia.4

Passionflower dosage for sleep

May modestly improve self-rated sleep quality over a week of evening tea*1,2,3,5

Early evidence

In a double-blind crossover trial, 41 healthy adults aged 18 to 35 drank a cup of passionflower or placebo tea each evening for a week. Sleep quality was rated about 5% better with passionflower, but it was the only one of six sleep diary measures that differed. Two extract trials found longer total sleep time: about 23 minutes longer in a sleep lab in 110 adults with a diagnosed sleep problem, and longer self-reported sleep in 65 stressed adults who slept poorly, in an industry-funded trial.

Amount studied: A tea of 2 g of dried herb in 250 mL of water, each evening for 7 days

The one placebo-controlled sleep trial we found in healthy adults used tea, not capsules. Of the two extract trials, the industry-funded one in stressed adults used 600 mg at bedtime. The dose in the other, in adults with a diagnosed sleep problem, is not in its published summary.2,3,5

In the tea trial, people drank the tea in the evening, partly to avoid sleepiness during the day.1

Comparing a label with the studies

A tea measured in grams of dried herb and a capsule measured in milligrams of extract cannot be compared without the extract ratio. Our Sleep formula's label, for example, gives 100 mg of passion flower extract and no ratio.1

Labels may also be wrong. In a 2025 analysis, five of six passionflower food supplements failed identity or content tests, so the amount printed may not match what is inside.6

What's in ours

What’s in ours

  • Sleep: Passion Flower Extract, 100 mg per serving, from the label

How much is safe

No upper limit has been set for passionflower. NCCIH says the tea may be safe for up to 7 nights, and daily use of the extract may be safe for up to 8 weeks.4

Possible side effects include drowsiness, dizziness and confusion.4

  • Do not use passionflower if you are pregnant4
  • Ask first if you take sedatives or sleep medicines, or if you are breastfeeding4
  • Tell your surgical team if you have taken it in the 2 weeks before surgery4

Questions people ask

How much passionflower is safe?

No upper limit has been set. NCCIH says the tea may be safe for up to 7 nights and daily extract for up to 8 weeks, and that it should not be used in pregnancy.4

How much passionflower tea should I drink for sleep?

The one sleep trial used a single cup a day, made from 2 g of dried herb in 250 mL of water and drunk in the evening, for a week.1,2

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Sources

  1. Janda K, Wojtkowska K, Jakubczyk K, Antoniewicz J, Skonieczna-Żydecka K. Passiflora incarnata in Neuropsychiatric Disorders: A Systematic Review. Nutrients. 2020;12(12):3894. Opened 2026-10-07.
  2. Ngan A, Conduit R. A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality. Phytother Res. 2011;25(8):1153-1159. Opened 2026-10-07.
  3. 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. Opened 2026-10-07.
  4. National Center for Complementary and Integrative Health. Passionflower. Bethesda (MD): National Institutes of Health. Last updated April 2025. Opened 2026-10-07.
  5. Lee J, Jung HY, Lee SI, Choi JH, Kim SG. Effects of Passiflora incarnata Linnaeus on polysomnographic sleep parameters in subjects with insomnia disorder: a double-blind randomized placebo-controlled study. Int Clin Psychopharmacol. 2020;35(1):29-35. Opened 2026-10-07.
  6. Brouns A, Lechtenberg M, Hensel A. Passionflower (Passiflora incarnata): Quality of Food Supplements Versus Registered Herbal Medicinal Products. Planta Med. 2025;91(9):532-540. Opened 2026-10-07.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.