Mulungu: What the Research Actually Shows (Benefits, Dose, Safety)

Two studies gave mulungu to people about to have wisdom teeth pulled. In the small one, 30 patients preferred it to placebo. In the bigger one, 200 volunteers got no more calm from it than from a dummy pill.

So does mulungu calm you down or not? That depends on which study you trust, and neither one tested what most people buy it for, which is sleep.

This guide covers Erythrina mulungu, a Brazilian tree whose bark is sold as a calming tea, capsule and tincture. Before you buy any, you need three things. What the evidence shows. What the dose sources say. And where the safety gaps are. You get all three below, plus why the “natural Valium” story doesn’t hold up.

Quick answer. Mulungu (Erythrina mulungu, also called Erythrina verna) is a Brazilian tree. Its bark is brewed as a calming tea. Lab work points to nicotinic receptor block, and the GABA link is unsettled. In people, two dental-anxiety trials split. One favored mulungu. One found no edge over placebo. No human sleep trial turned up.

Jump to:

• Does it work?
• Is it a natural Valium?
• How much do people take?
• Is it safe?
• Mulungu vs kava and passionflower
• How to buy it
• FAQ

What is mulungu?

Mulungu is the common name for Erythrina mulungu Mart. ex Benth., a tree in the legume family. It grows 10 to 14 m tall. It drops red-orange flowers that hummingbirds pollinate, and it makes black seedpods with red-and-black seeds. People string those seeds into necklaces. Don’t eat them.

The tree is native to Brazil. The Brazilian Ministry of Health lists it across the North, Northeast, Center-West and Southeast. Some sources place it in Bolivia and Peru too. The part people brew is the bark. Flowers and leaves show up in the lab studies.

Quick check on the name, because it trips people up. Brazil has towns called Mulungu in Paraíba and Ceará, and a Mulungu do Morro in Bahia. If you search the one word, you get all of that.

The plant has an official footprint in Brazil. It sits on RENISUS, the Ministry’s 2009 list of 71 medicinal plants of interest to the public health system. It has a bark monograph in the Brazilian Pharmacopoeia. It also appears in calming combination products such as Maracugina. But the Ministry’s 2023 monograph found no valid Anvisa registration for any medicine containing it, and none for mulungu alone.

Which plant is in the bag?

The botany is messy. The Ministry monograph and one herb book treat E. verna as another name for E. mulungu. A Brazilian monograph volume says the two are now considered separate species. That same volume lists five species that all go by “mulungu” and get used the same way.

The research is lopsided. In one 2014 count of 253 papers, E. velutina made up 69 of the 78 agricultural studies and 27 of the 32 biology studies.

One Ministry source argues that the species don’t matter as long as the plant carries the sedative alkaloids. Fine. But a label that only says “mulungu” tells you nothing about the alkaloids. The same monograph found no method for measuring them in the bark drug. And the book that counted those 253 papers checked online sellers and found they listed only the common name.

Does mulungu work? The evidence, tier by tier

Nobody knows yet. The human data is thin and it points both ways. The animal and cell data is better, but it’s animal and cell data.

The sources behind this guide contain no human sleep trial. That’s worth saying twice, because most pages sell mulungu as a sleep herb.

Tier 1: the two dental trials, side by side

The same surgery at the same hour gave two answers. The first trial measured preference and a dental anxiety scale. The second compared mulungu with a real sedative and a second herb. The bigger trial is the harder test.

Both trials used one dose. Neither tested a week of tea. Neither tested sleep. You can’t stretch them into “mulungu helps anxiety every day.” You can read them as “one dose didn’t reliably beat placebo in 200 people.”

There is a third human study in the record, and it mixes products. A Brazilian trial gave 96 outpatients with mild anxiety a product containing passionflower (P. alata), hawthorn and mulungu. It compared it with a second herbal combination. Neither product beat the other by a statistically meaningful margin. Sleepiness was the main side effect. It had no placebo arm, and you can’t tell what the mulungu did inside the mix.

The Ministry’s 2023 monograph is blunt about this. It says efficacy has not been shown in any clinical study. Its clinical section lists only that combination trial.

Tier 2: animal studies

Rodent work is where mulungu looks best.

• Rats given a flower extract by mouth at 200 mg/kg behaved like rats given diazepam in an elevated T-maze. Doses of 50, 100 and 200 mg/kg for 9 days also worked.
• Mice given isolated alkaloids (erythravine, 11-α-hydroxyerythravine) at 3 and 10 mg/kg spent more time in the lit half of a light-dark box.
• Alkaloids injected into rat brain ventricles blocked seizures in several models, up to 100% in some.
• A stem bark extract at 200 to 400 mg/kg, injected into mice, acted as a central nervous system depressant. It cut movement but did not wreck coordination on a rotarod.
• A flower extract showed no antidepressant effect in the rat forced-swim test.

Notice how many of these used flowers, injections or isolated alkaloids. A mug of bark tea is none of those. And mg/kg in a mouse doesn’t convert cleanly to a person.

Tier 4: tradition

The bark has a long record as a sedative. Brazilian indigenous groups use it. The Ministry monograph says pre-Columbian cultures took a bark decoction for fear and hardship in wartime. Afro-Brazilian users call it a nerve tranquilizer. Several editions of the Brazilian Pharmacopoeia list it as a sedative and calming agent.

The book that counted the literature found just five ethnobotanical papers with usable use data. All five came from the Brazilian Northeast. The main uses were insomnia, calming, anxiety, cough and bronchitis.

Is mulungu a natural Valium? How it might work

Lab work points to nicotinic receptors. The GABA story is not settled.

In 2013, a PLoS ONE team tested three alkaloids from mulungu flowers on cultured cells. Two of them, erythravine and 11-α-hydroxyerythravine, blocked α4β2 nicotinic acetylcholine receptors at 13 nM and 4 nM. At α7 receptors, the same two needed 6 µM and 5 µM. That’s hundreds of times more. The third alkaloid inhibited least. The authors suggest this could explain the anxiolytic effects seen in animals.

What about GABA? One herb book repeats a 2002 suggestion that the alkaloids “may alter GABAergic neurotransmission.” Another alkaloid, erysotrine, blocked seizures in rats. Yet it didn’t change glutamate or GABA binding and uptake in rat cortex preparations.

A Brazilian monograph adds that GABA-A and nicotinic receptors belong to the same receptor family, and some work links Erythrina to GABA-A in part. The Ministry notes that mulungu alkaloids acted in rodent tests that are sensitive to benzodiazepines and to serotonin drugs.

So the honest label is “mechanism not settled.”

Here’s why “natural Valium” misleads:

• The diazepam comparisons are rodent maze tests with extracts or isolated alkaloids. A similar score in a maze isn’t the same drug.
• In the larger human trial, mulungu couldn’t beat placebo.
• One rodent study on E. velutina bark saw a memory-impairing effect at low doses that faded at higher doses. Benzodiazepines don’t behave that way.

The nicotinic angle also explains why people ask about quitting smoking. Two lab studies in one herb book suggest an Erythrina alkaloid might work as an anti-nicotine agent. That’s cells and animals. Treat it as a hypothesis.

The flower vs bark gap

Most of the alkaloid work behind the headline claims used flowers. Erythravine, 11-α-hydroxyerythravine and erysotrine all came from flowers in those papers.

The bark has alkaloids too. Researchers have found erysotrine, erythratidine and related compounds in bark, plus erythraline in stem bark and erythravine in a methanol bark extract. But the Ministry monograph found no method to quantify the alkaloids in the bark drug. Retail powder and capsules come with no such standard.

That’s a limit of the evidence. It doesn’t prove bark is useless. It means the studies and the product on your shelf may not match.

What do people report?

Anecdotes sit at Tier 5. They show how people behave and what they fear. They don’t prove an effect.

Four themes repeat. Onset runs from a few minutes to 30 or 60 minutes, depending on who you ask. Some people get sedation and some get alertness. People argue about tea versus powder. And “works for some, nothing for others” shows up again and again. Two trials with 230 people split the same way.

Forms: tea, powder, tincture, capsules

No study compares forms. The human trials used a capsule. The old Brazilian rule used a bark decoction.

One herb book says its mulungu, passionflower, damiana and manaca tea tastes bad, so it suggests the tincture. A Brazilian monograph volume says the literature describes only homemade preparations and no standardized extract formulations.

How much do people take? The dose spread

The numbers run from 500 mg to about 18 g of bark a day. That’s roughly 36 times apart, and none of it is a prescription.

The 36x comes from 6 g × 3 cups = 18 g a day (the top of the old Brazilian rule) against a 500 mg trial capsule. The units differ, but the spread is real.

Two more things. The Brazilian rule that gave 4 to 6 g is revoked. It’s history. It isn’t current guidance. And it capped tea at 3 days in a row. The 30-day limit you’ll see on some vendor pages has no trial behind it. Nothing in these sources sets that number.

Does more mean safer? No. Nothing here says more is better or safer, and no source sets a safe upper limit. If you take other medicines, ask a pharmacist before you try any dose.

Is mulungu safe? Side effects and who should skip it

This is not medical advice. Talk to a clinician or pharmacist before you use mulungu, especially if you take other drugs or have a heart condition. Last reviewed 4 October 2026.

The safety record is mostly rodents and tradition. There’s no human safety trial for mulungu alone.

Seeds

The sources agree on this one. Erythrina seeds contain toxic alkaloids. Some species’ seeds have been used to numb fish and as rat poison. Don’t consume them.

Side effects the sources list

Drowsiness is the common one. It appeared in the first dental trial and in the combination-product trial. One herb book says the plant is a sedative that may cause drowsiness and may lower blood pressure. Health and vendor pages sometimes list muscle paralysis. None of them give a rate. The Ministry monograph found no adverse-effect data for the bark drug.

The paralysis question

The nicotinic mechanism makes people nervous, and the history explains why. The curare-like lab effects in this genus come from alkaloids such as erythroidine, first isolated from E. americana seeds.

One herb book says erysodine, found in mulungu, has neuromuscular effects like curare arrow poison. Another source cites muscle-paralyzing effects of related alkaloids in frogs, and a lethal dose of 24 mg/kg for β-erythroidine injected into mice.

Some data points the other way.

• In mice, a bark extract at 200 to 800 mg/kg did not affect coordination on a rotarod.
• Mice given up to 5 g/kg of dry bark extract by mouth showed no deaths over 14 days, only slight raised fur.
• The first dental trial saw no motor impairment.

So you get three honest statements. Related alkaloids do block muscle nicotinic receptors in lab animals. The sources contain no human case of paralysis from mulungu. And they contain no human safety trial either. Forum users argue the structures differ from curare alkaloids. That’s a forum argument. It isn’t data.

Pregnancy and breastfeeding

Avoid it. A Brazilian herbal reference advises against the bark decoction in pregnancy and lactation. In rats given 1.5 g/kg of bark extract from day 1 to 19 of pregnancy, mothers gained less weight, post-implantation loss went up, placenta weight changed and some fetal measurements shrank. Common malformations like cleft palate weren’t seen. It’s animal data. But there’s no human data to outweigh it.

Heart and blood pressure

One herbal reference says people with heart failure or heart rhythm problems shouldn’t use Erythrina preparations. Animal work shows blood-pressure lowering, so one herb book advises caution if you take blood pressure drugs or run low.

Medication interactions

None were formally tested. The sources raise these flags:

• Psychotropic drugs, antihistamines, beta blockers and diabetes drugs need monitoring (Brazilian herbal reference).
• Mulungu may add to diazepam-type drugs and blood pressure drugs (herb book).
• Alcohol and antidepressants weren’t tested with mulungu in any source here. Treat mulungu as an added sedative.

What the animal toxicity work shows

• Bark extract at up to 5 g/kg in one dose: no deaths in mice.
• Bark extract at 2.5 g/kg daily for 30 days in rats: slightly lower general activity and longer sleep with pentobarbital.
• A four-herb product containing mulungu, at 10 times the human dose for 30 days: no toxic effect in rats and rabbits.
• Leaf and flower extracts at 200 and 400 mg/kg raised micronucleus counts in mice, a sign of possible DNA damage. Bark wasn’t tested in that study.

Long-term use and dependence

There’s no human data on long-term use. There’s none on dependence either. If a page says “not addictive,” ask for the source. I couldn’t find one.

Mulungu vs kava and passionflower

Passionflower has the better human evidence. Kava has a known liver warning. Mulungu has neither a clear win nor a clear loss.

One popular herb book claims mulungu gives the same calming effect as kava, “if not better,” and is poised to replace it. No head-to-head human trial in these sources backs that up. Take it as marketing.

If you came here from the kratom forums, note that the mechanisms differ. This guide makes no kratom-style claims for mulungu.

How do you buy mulungu without guessing?

If the label says only “mulungu,” you don’t know what you’re buying.

Look for these on the label:

• The botanical name. Erythrina mulungu, E. verna or E. velutina, not just “mulungu.”
• The plant part. Bark, not seeds.
• Amount per capsule, or grams of bark per bag.
• Country of origin.
• Any batch testing for heavy metals and pesticides. The Ministry monograph flags both for herbal raw materials.

Skip anything that includes seeds or hides the amount in a proprietary blend. And skip claims like “natural Valium.”

Marketplace labels get odd. You’ll see “wild crafted,” “fine powder,” “verna” or just a country name. They’re inconsistent, and none of them tells you the alkaloid content.

Bottom line

Mulungu is a traditional Brazilian calming bark with promising rodent data and a plausible lab mechanism. In people, the evidence is two single-dose dental trials that disagree. There is no human sleep trial, no daily-use trial and no human safety trial.

If you still want to try it:

• Buy a product that names the species, the plant part and the amount.
• Skip seeds, blends that hide the amount, and anything sold as “natural Valium.”
• Skip it if you are pregnant or breastfeeding.
• Talk to a clinician or pharmacist first if you take other medicines or have a heart or blood pressure condition.

If stress is the real problem, start with a structured plan like the 14-Day Cortisol Reset Protocol.

Keep reading

• DSIP and sleep
• Pinealon and the pineal gland

References

Primary papers

1. Setti-Perdigão P, et al. Erythrina mulungu alkaloids are potent inhibitors of neuronal nicotinic receptor currents in mammalian cells. PLoS ONE 2013;8(12):e82726. doi:10.1371/journal.pone.0082726
2. Silveira-Souto ML, et al. Effect of Erythrina mulungu on anxiety during extraction of third molars. Med Oral Patol Oral Cir Bucal 2014. PMC4192578. ClinicalTrials.gov NCT01948622.
3. da Cunha RS, et al. Herbal medicines as anxiolytics prior to third molar surgical extraction: a randomized controlled clinical trial. Clin Oral Investig. PMID 32951121
4. Fiss E, et al. Passiflora, Crataegus and Erythrina combination efficacy and tolerability compared to Passiflora, Crataegus and Salix in insomnia and mild anxiety. Rev Bras Med 2006;63(9):489-496.

Reviews and official documents

1. Brazil Ministry of Health. Informações Sistematizadas da Relação Nacional de Plantas Medicinais de Interesse ao SUS: Erythrina mulungu Mart. ex Benth., Fabaceae (Mulungu). Brasília, 2023. ISBN 978-65-5993-462-1. Cites Onusic 2002 and 2003, Flausino 2007, Faggion 2011, Rosa 2012, Vasconcelos 2003 to 2007, Ribeiro 2006, Proença 2012, De Bona 2012 and De Mello 2007.
2. Gilbert B, Alves LF, Favoreto RF. Monografias de Plantas Medicinais Brasileiras e Aclimatadas, Volume II. Rio de Janeiro: Abifisa/Fiocruz, 2022. Entry: Erythrina spp. (Mulungu), pp. 121-140. doi:10.7476/9786557081778
3. Silva-Mann R, Rabbani ARC, Gomes LJ, eds. Pensando a Biodiversidade: Mulungu (Erythrina sp.). Instituto Federal da Bahia. Chapters on phytochemistry and pharmacology, ethnobotany and academic publications.
4. The Healing Power of Rainforest Herbs. Entry: Mulungu, pp. 363-366, plus remedy and use tables.
5. NCCIH. Kava. Updated April 2025. nccih.nih.gov/health/kava