Ingredient guide
Passionflower is a vine whose herb is used for everyday stress and mild sleep difficulties. Small randomised trials and a systematic review support a calming effect and modest sleep improvement. It acts on GABA, the brain's main calming neurotransmitter.
Limited evidencePassionflower, or Passiflora incarnata, is a vine native to the Americas with striking purple flowers. The dried above-ground parts are used as a herbal calming remedy and mild sleep aid. The supplement comes as capsules, tinctures, tablets, and tea. Active compounds include flavonoids and small amounts of harmala alkaloids.
Passionflower compounds appear to boost the level or activity of GABA, the brain's main calming neurotransmitter. This is the same pathway that prescription anti-anxiety medicines target, although passionflower acts more gently. The result, in theory, is a slight lowering of brain activity that supports relaxation and sleep.
Several small trials support a calming effect. In a randomised, placebo-controlled trial in dental patients, passionflower premedication significantly reduced anxiety scores before the procedure. A systematic review found that most studies reported lower scores with passionflower, though the effect was less obvious in people with mild baseline symptoms.
For sleep, a 1-week crossover trial of passionflower tea versus placebo in 41 subjects found a short-term improvement in self-rated sleep quality. Recent research extends this with stress-and-sleep combined trials showing modest benefits. We grade the overall evidence as limited but consistent. Passionflower is a gentle, non-habit-forming option for everyday stress and occasional sleep trouble.
For sleep, a cup of tea or 500 mg of dried herb in the evening fits the more positive small trials. For everyday stress, 500 mg to 1,500 mg per day in divided doses has been used. Avoid combining it with sedatives or alcohol, and check with a healthcare provider before regular use if you take related medicines.
Trials commonly use 500 mg to 1,500 mg of dried herb per day, or 1 cup of passionflower tea in the evening. Allow at least 4 weeks for general use. Take in the evening for sleep. Ask your healthcare provider before regular use if you take sedatives.
Small randomised trials support a calming effect, especially in situations like dental treatment. The effect is gentler than prescription medicines.
A small short trial of passionflower tea showed improved self-rated sleep quality. The evidence is limited but positive for mild sleep difficulties.
No, it is not considered habit-forming. The herb is generally classed as a gentle, non-dependence option.
Most people tolerate a cup nightly fine. If you take sedatives or sleep medicines, check with a provider first, since the effects may add together.
