Vanapsa: Traditional Uses, Evidence & Safety

TL;DR

Vanapsa is sweet violet, Viola odorata, Banafsha in the Unani and Ayurvedic traditions. It has something most herbs on this site lack: human randomized trials. Violet oil nasal drops improved insomnia scores in a 75-patient RCT, and violet flower syrup sped cough suppression in 182 asthmatic children in a double-blind trial. Traditional Ayurvedic use centers on cough, sore throat, and fever. Effects are modest and adjunctive, not curative.

What it is

Vanapsa (Viola odorata Linn.), family Violaceae, is the sweet violet: a low, creeping perennial with heart-shaped leaves and intensely fragrant purple flowers. In India it is known as Banafsha and used in both the Unani and Ayurvedic traditions, usually as the dried flowers.

Reported constituents include mucilage, saponins, flavonoids, alkaloids, glycosides, and vitamin C (JRMDs review). The mucilage content is the likely basis of its traditional demulcent action on irritated throats.

Traditional use

Ayurvedic and Unani texts use Banafsha for cough, sore throat, cold, fever, and headache. Generally as a flower decoction or syrup, valued as cooling and soothing to the respiratory passages (Banafsha review, WJPR 2020).

Rasa-panchaka per the batch data: sweet and bitter tastes (Madhura, Tikta), unctuous quality (Snigdha), cooling potency (Sheeta), sweet post-digestive effect (Madhura vipaka). It pacifies Pitta and Kapha and aggravates Vata. Traditional framing, as always. The trials below are a separate matter.

What modern research says

Insomnia (randomized controlled trial)

Feyzabadi et al. ran a three-arm, double-blind, randomized trial in 75 patients with chronic insomnia. It compared intranasal violet oil (a traditional preparation of Viola odorata in almond oil) versus plain almond oil versus placebo. The dose was three drops per nostril nightly for 30 days. Sleep quality (PSQI) and insomnia severity (ISI) improved in all groups. Violet oil improved the most, with significant between-group differences after the intervention (RCT, Journal of Ethnopharmacology, 2018) (PubMed abstract 29217495).

A 2022 systematic review and meta-analysis in Frontiers in Neurology pooled the insomnia trials (224 patients total). It concluded violet extract improved sleep quality, sleep duration, and insomnia index scores versus placebo (Huang et al., 2022). Small trials, short durations, but the signal is consistent and human.

Cough in asthmatic children (randomized controlled trial)

Qasemzadeh et al. randomized 182 children aged 2–12 with intermittent asthma to violet flower syrup or placebo, as an add-on to standard short-acting β-agonist treatment. The violet-syrup group reached 50% cough reduction and full cough suppression significantly faster than placebo (double-blind RCT, Journal of Evidence-Based Complementary & Alternative Medicine, 2015; DOI: 10.1177/2156587215584862) (review summary).

Note what this does and does not show. It shows faster cough suppression as an adjunct, in children, alongside conventional treatment. It does not show that violet syrup treats asthma or replaces inhalers.

Sedation and diuresis (animal studies)

Ethanolic and chloroform extracts of V. odorata increased ketamine-induced sleeping time in rats in a dose-dependent manner, outperforming diazepam at the tested doses (animal study, cited in Banafsha review). Fractions of the aerial parts showed diuretic activity in rats (Vishal et al., 2009). Supportive rather than decisive.

What the evidence does not support (yet)

The traditional fever and sore-throat uses have no direct trial support. The insomnia evidence rests on small, short Iranian trials of a specific nasal-oil preparation. Promising, not definitive. Nothing here supports using violet preparations for serious respiratory disease without conventional care.

Safety & contraindications

The trial record is reassuring as far as it goes. The insomnia trial reported no adverse effects in the violet-oil group. No health threats or side effects have been reported for Viola odorata in the review literature (Frontiers review, 2022). That said, trial populations were small and short-term. There are no adequate data on pregnancy or breastfeeding. The cough trial was conducted as an add-on to standard asthma therapy. Violet syrup should never substitute for prescribed asthma medication in children.

FAQs

What is Vanapsa?

Vanapsa is sweet violet, Viola odorata, Banafsha in Unani and Ayurvedic medicine. The fragrant purple flowers are used in decoctions, syrups, and a traditional nasal oil.

Does violet oil actually help insomnia?

In one 75-patient double-blind RCT, intranasal violet oil nightly for 30 days improved sleep quality and insomnia severity more than almond oil or placebo (J Ethnopharmacol, 2018). A 2022 meta-analysis of the small trials agreed. Encouraging, but the trials are small and short.

Can violet syrup help my child's cough?

In one trial of 182 asthmatic children, violet flower syrup added to standard inhaler treatment suppressed cough faster than placebo. It was tested as an adjunct, not a replacement for asthma medication. Talk to the child's doctor first.

What is Vanapsa used for in Ayurveda?

Traditionally for cough, sore throat, cold, fever, and headache: valued as cooling and soothing. The cough and insomnia uses now have some human-trial support; the rest remains traditional.

Is Vanapsa safe?

No adverse effects were reported in the insomnia trial, and the review literature notes no reported toxicity. Data are limited to small, short trials. No adequate pregnancy or breastfeeding data exist.

Our editorial rule requires a pharmacopoeial or clinical-trial dose before stating one. The trials used specific preparations (nasal oil drops; flower syrup) for limited durations, which does not amount to a general dosing recommendation. We state none.

Annotated Sources

The insomnia RCT is Feyzabadi Z et al., "Efficacy of Violet oil, a traditional Iranian formula, in patients with chronic insomnia: A randomized, double-blind, placebo-controlled study," Journal of Ethnopharmacology 214:22–28, 2018 (PubMed 29217495). The meta-analysis is Huang S et al., "The Efficacy of V. odorata Extract in the Treatment of Insomnia: A Systematic Review and Meta-Analysis," Frontiers in Neurology 13, 2022 (full text). The cough trial is Qasemzadeh MJ et al., "The Effect of Viola odorata Flower Syrup on the Cough of Children With Asthma," Journal of Evidence-Based Complementary & Alternative Medicine 20(4):287–291, 2015 (DOI: 10.1177/2156587215584862). Traditional uses and constituents are compiled in the Banafsha review (World Journal of Pharmaceutical Research 9(10), 2020) (Academia).

Disclaimer

This article is for educational purposes only and is not medical advice. The human trials of Viola odorata are small and short-term; violet preparations should not replace prescribed treatment for insomnia, asthma, or any medical condition. Talk to a qualified healthcare practitioner before use — especially for children, or if pregnant, breastfeeding, or taking prescription medicines.