Apigenin is a flavonoid found in chamomile, sold as a sleep and calm supplement in capsules of around 50 mg. The reason people expect it to work is real: apigenin binds the same receptor site that valium-type drugs use, which is where its calming reputation comes from. What is thin is the human evidence for the supplement itself. No trial has tested an isolated apigenin capsule for sleep or anxiety in people.
What has been tested is chamomile extract, which contains apigenin alongside many other compounds, and there the picture is small and mixed: chamomile modestly improved sleep quality across a dozen small trials and eased generalized anxiety over several weeks, but it did nothing measurable for insomnia severity or short-term state anxiety, and its benefit in new mothers faded within a month. So the case for apigenin rests on how it works and on small chamomile trials, not on studies of the apigenin capsule people actually buy. Chamomile tea is the free version, and a cup in the evening is a well-tolerated calming ritual whatever the capsule adds.
Findings & Outcomes
What It Is
Apigenin is a flavonoid, one of the plant pigments, and it is the compound most often named when people talk about why chamomile is calming. It occurs in German chamomile flowers and in smaller amounts in parsley, celery and a few other plants. Sold on its own, it comes as a capsule of roughly 50 mg, marketed for sleep and relaxation, and it has become a fixture of popular evening supplement stacks.
Two facts shape everything on this page. The first is that apigenin acts on a well-known brain receptor, which gives the calming claim a real mechanism to point to. The second is that almost all the human research uses chamomile, the whole plant extract or the tea, rather than the isolated compound. Chamomile is a mixture of many active substances, so a benefit measured for chamomile cannot be assigned to apigenin alone, and the isolated apigenin supplement sold for sleep has not itself been put to a trial.
What It Does
The clearest way to read apigenin is to separate what is shown in the lab from what is shown in people, and within the human work to keep chamomile and isolated apigenin apart.
- Receptor mechanism is the best-established part, and it is laboratory work: apigenin binds the benzodiazepine site of the GABA-A receptor, the brain's main calming system.
- Anxiety in animals follows from that: apigenin reduced anxiety-like behavior in mice without sedating them.
- Chamomile for sleep quality and generalized anxiety is the human signal, modest and drawn from small trials of the extract and tea, not the isolate.
- Chamomile for insomnia severity and on-the-spot anxiety is where the trials came up empty, a real measured null rather than a gap.
- Isolated apigenin in people has not been tested for sleep or anxiety at all, so the popular supplement claim runs ahead of its evidence.
Each card below grades one of these at the strength of its own evidence. Read the direction and the tier together: the sleep-quality and anxiety cards point toward benefit at emerging strength, the insomnia and state-anxiety cards are measured nulls, and the mechanism cards are laboratory and animal findings that do not by themselves establish an effect in people.
The Research & Studies
Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.
Anxiety And Stress
Chamomile extract cut anxiety more than placebo over 8 weeks in mild-to-moderate GAD (HAM-A, p=0.047)
Over 8 weeks, people with mild-to-moderate anxiety who took a standardized chamomile extract had a modestly bigger drop in their anxiety scores than those on a dummy capsule.
In a randomized, double-blind, placebo-controlled trial of 57 outpatients with mild-to-moderate generalized anxiety disorder, a standardized chamomile extract (capsules standardized to 1.2% apigenin, escalated up to 1100 mg a day) over 8 weeks produced a significantly greater fall in the Hamilton Anxiety Rating (HAM-A) score than placebo (p=0.047), with tolerability similar to placebo. Measured in: 57 adult outpatients with mild-to-moderate GAD (28 chamomile, 29 placebo). A single small 8-week trial, and it tested whole chamomile extract, not isolated apigenin; the p-value (0.047) sat just under the 0.05 threshold, so the result is modest and awaits replication.
Who this may not transfer to:Mixed-sex outpatient sample with GAD; the finding is reported for adults with generalized anxiety.
The study · 1
Amsterdam et al., A randomized, double-blind, placebo-controlled trial of oral Matricaria recutita (chamomile) extract therapy for generalized anxiety disorder · J Clin Psychopharmacol 2009
Long-term chamomile did not significantly lower GAD relapse versus placebo over 26 weeks
People whose anxiety had improved on chamomile were kept on it or switched to placebo; slightly fewer relapsed on chamomile, but the difference was small enough that it could have been chance.
After 12 weeks of open-label chamomile at 1500 mg a day, responders with generalized anxiety were randomized to 26 weeks of continued chamomile or placebo. Fewer people relapsed on chamomile than on placebo, but the difference in the primary outcome, time to relapse, did not reach statistical significance. Symptom scores stayed lower on chamomile and side effects were few. Measured in: Responders from a moderate-to-severe GAD cohort, randomized in the continuation phase. The relapse-prevention result was numerically in chamomile's favor but not statistically significant, so it does not establish that continued chamomile prevents relapse; it tested whole extract, not isolated apigenin.
Who this may not transfer to:Mixed-sex adults with moderate-to-severe GAD; the relapse finding is reported for that group.
The study · 1
Mao et al., Long-term chamomile (Matricaria chamomilla L.) treatment for generalized anxiety disorder: a randomized clinical trial · Phytomedicine 2016
Pooled across three trials, chamomile did not reduce short-term state anxiety (SMD -0.15)
When researchers pooled trials measuring in-the-moment anxiety, chamomile was no better than the comparison.
In the same review, a meta-analysis of three randomized trials found no significant effect of chamomile on state anxiety, the transient anxiety of the moment, with a standardized mean difference of -0.15 (95% CI -0.46 to 0.16, p=0.42). Measured in: Three randomized trials pooled for state anxiety. A small pooled set of three trials measuring short-term anxiety; a null here does not rule out the slower effect seen over weeks in generalized anxiety, but it does not support chamomile as an on-the-spot calmative.
Who this may not transfer to:Pooled across mixed-sex trials; the null state-anxiety result is reported for adults broadly.
The study · 1
Systematic review and meta-analysis: therapeutic efficacy and safety of chamomile for state anxiety, generalized anxiety disorder, insomnia, and sleep quality · Phytother Res 2019
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
In mice, apigenin reduced anxiety-like behavior without sedation or muscle relaxation
Given to mice, apigenin made them behave less anxiously in a standard fear test, without the drowsiness or floppiness that sedative drugs cause.
In the elevated plus-maze, a standard rodent test of anxiety, apigenin reduced anxiety-like behavior in mice at doses comparable to those used for classical benzodiazepines, and did so without the sedation, muscle relaxation, or anticonvulsant effects those drugs produce. A slight sedative effect appeared only at higher doses. An animal behavioral result at injected or high oral doses in mice, which does not translate directly to a human taking a capsule; effective doses in people, if any, are not established.
The study · 1
Viola et al., Apigenin, a component of Matricaria recutita flowers, is a central benzodiazepine receptors-ligand with anxiolytic effects · Planta Med 1995
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
Sleep
Across trials, chamomile improved sleep quality versus control (SMD -0.73)
Pooling a dozen small trials, people who took chamomile rated their sleep quality moderately better than those who did not.
A systematic review and meta-analysis of randomized and quasi-randomized trials pooled the sleep-quality data and found chamomile improved self-rated sleep quality versus control, with a standardized mean difference of -0.73 (95% CI -1.23 to -0.23, p<0.005), a moderate effect. The review also found chamomile improved generalized anxiety over 2 and 4 weeks. Measured in: 12 randomized and quasi-randomized trials pooled across sleep and anxiety outcomes. The pooled trials were small, of varied quality, and tested chamomile preparations (tea, extract) rather than isolated apigenin; the wide confidence interval and mixed underlying trials keep this at emerging strength.
Who this may not transfer to:Pooled across mixed-sex trials in varied adult populations; the sleep-quality effect is reported for adults broadly.
The study · 1
Systematic review and meta-analysis: therapeutic efficacy and safety of chamomile for state anxiety, generalized anxiety disorder, insomnia, and sleep quality · Phytother Res 2019
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
Standardized chamomile extract did not improve any sleep measure in chronic insomnia over 28 days
In people with diagnosed insomnia, a standardized chamomile extract twice a day for a month changed none of their sleep measurements compared with a dummy capsule.
In a randomized, double-blind, placebo-controlled pilot trial, 34 adults with chronic primary insomnia took 270 mg of standardized chamomile extract twice a day for 28 days. There were no significant differences from placebo in total sleep time, sleep efficiency, sleep latency, wakefulness after sleep onset, sleep quality, or number of awakenings. A modest, non-significant advantage appeared on daytime functioning. Measured in: 34 adults aged 18 to 65 with chronic primary insomnia. A small pilot trial (34 people) that may have been underpowered for small effects, but it found no signal on any sleep measure and tested extract, not isolated apigenin.
Who this may not transfer to:Mixed-sex adults with chronic primary insomnia; the null result is reported for that group.
The study · 1
Zick et al., Preliminary examination of the efficacy and safety of a standardized chamomile extract for chronic primary insomnia: a randomized placebo-controlled pilot study · BMC Complement Altern Med 2011
Chamomile extract 400 mg a day improved sleep quality in nursing-home elders over 28 days
Older adults in a care home who took chamomile extract for a month rated their sleep as better than those who did not.
In a single-blind randomized trial, 60 nursing-home residents aged 60 or older took 200 mg of chamomile extract twice a day (400 mg daily) or placebo for 28 days. The chamomile group improved their Pittsburgh Sleep Quality Index scores significantly more than the control group (p<0.05). Measured in: 60 nursing-home residents aged 60 and older. A small, single-blind trial (60 people) at one care home, which is a weaker design than double-blind, and it tested whole extract rather than isolated apigenin.
Who this may not transfer to:Mixed-sex older adults in residential care; the finding is reported for that population and may not extend to younger, healthier sleepers.
The study · 1
Adib-Hajbaghery and Mousavi, The effects of chamomile extract on sleep quality among elderly people: a clinical trial · Complement Ther Med 2017
Chamomile tea for 2 weeks improved sleep and mood in postnatal women, fading by week 4
New mothers who drank chamomile tea for two weeks slept better and felt less low right afterward, but a month later they were no different from the women who did not.
In a randomized controlled trial, 80 Taiwanese postnatal women with poor sleep drank chamomile tea daily for 2 weeks or received usual postpartum care. The chamomile group scored better on sleep quality and on depressive symptoms immediately after the 2 weeks, but at a 4-week follow-up the differences between the groups were no longer significant. Measured in: 80 postnatal women with poor sleep quality. The benefit was short-lived and gone by the 4-week follow-up, the control group got usual care rather than a placebo tea (so expectation could contribute), and the drink was chamomile tea, not isolated apigenin.
Who this may not transfer to:Studied only in postnatal women; the finding is specific to that group and does not transfer to men or to the general population.
The study · 1
How it works
Apigenin binds the benzodiazepine site of the GABA-A receptor (Ki about 4 micromolar)
In lab tests apigenin latches onto the same brain receptor site that valium-type drugs use, which is why it is expected to calm, though it grips that site much more weakly than those drugs.
In receptor-binding assays apigenin competitively displaced flunitrazepam from the central benzodiazepine site of the GABA-A receptor, with an inhibition constant (Ki) of about 4 micromolar, and had no effect on muscarinic or alpha-1 adrenergic receptors or on the separate GABA (muscimol) binding site. This is the receptor apigenin's calming reputation is built on, the same site prescription benzodiazepines act at, though apigenin's affinity for it is far weaker. This is a test-tube binding result. A molecule binding a receptor in an assay does not establish that a swallowed dose reaches the brain in people or changes how they sleep or feel; apigenin also has low oral bioavailability, so how much crosses into the brain after a capsule is unclear.
The study · 1
Viola et al., Apigenin, a component of Matricaria recutita flowers, is a central benzodiazepine receptors-ligand with anxiolytic effects · Planta Med 1995
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
Evidence And Methods
No human trial has tested isolated apigenin at supplement doses for sleep or anxiety
Nobody has run a human trial on the apigenin capsule people actually buy; the human evidence is all about chamomile, which contains apigenin plus a lot of other things.
As of early 2026 there is no published human clinical trial of an isolated apigenin capsule at the doses sold as sleep supplements (commonly 50 mg) for sleep or anxiety outcomes. The entire human record is on chamomile preparations, which deliver apigenin alongside many other compounds, so the popular apigenin-for-sleep claim rests on receptor mechanism and on small chamomile trials rather than on studies of the supplement itself. This describes a gap in the literature, not a finding that apigenin fails; the absence of a trial is not evidence of no effect, only that the isolated supplement has not been tested in people.
The study · 1
Kramer and Johnson, Apigenin: a natural molecule at the intersection of sleep and aging · Front Nutr 2024
How It Works
Apigenin's mechanism is the strongest thing about it and the reason the sleep claim exists. The steps below trace what has been shown, and where the chain from receptor to a better night's sleep is still missing links.
Anatomy of the Practice
1Binds the calming receptor
In binding assays apigenin attaches to the benzodiazepine site of the GABA-A receptor, the same site prescription benzodiazepines act at, with an inhibition constant of about 4 micromolar. That receptor is the brain's main brake, so a molecule that acts there is expected to calm. Apigenin grips the site far more weakly than a benzodiazepine drug does, and this is a test-tube result, not a measurement in a living brain.
2Calms mice without sedating them
Given to mice, apigenin reduced anxiety-like behavior in the elevated plus-maze at doses comparable to benzodiazepines, and did it without the sedation or muscle relaxation those drugs cause. A slight sedative effect appeared only at higher doses. This is the animal counterpart to the binding result, and it still sits a long way from a person swallowing a capsule.
3The missing step: getting into the brain
Apigenin is poorly absorbed and rapidly processed, so how much of an oral dose reaches the brain in people is unclear. This is the gap the mechanism story usually skips: binding a receptor in a dish does not prove that a 50 mg capsule delivers enough apigenin, past the gut and liver and into the brain, to change how a person sleeps.
The mechanism holds up, and it is incomplete. Apigenin does act on the right receptor, which is why the calming reputation is not made up. Whether a swallowed supplement reaches that receptor in a meaningful amount, and then changes sleep or anxiety, is the part that has not been shown.
Chamomile Is Not the Same as an Apigenin Capsule
Nearly all the human evidence people cite for apigenin is really evidence for chamomile. Chamomile extract and chamomile tea deliver apigenin, but they also deliver many other compounds, and the trials measured the whole preparation. That matters because a benefit found for chamomile cannot be pinned on apigenin, and because the isolated apigenin supplement sold for sleep has never been the thing under test.
What the chamomile trials found, taken together, is a small and uneven picture:
- A meta-analysis of a dozen small trials found chamomile improved self-rated sleep quality by a moderate amount versus control, and eased generalized anxiety over two to four weeks.
- An 8-week randomized trial in mild-to-moderate generalized anxiety found a standardized chamomile extract beat placebo on anxiety scores, though the result sat just under the significance line.
- A trial of standardized chamomile extract in people with diagnosed insomnia found no change in any sleep measure over 28 days.
- Pooled trials of short-term state anxiety, the anxiety of a stressful moment, found no effect.
- Chamomile tea helped new mothers sleep and lifted low mood for two weeks, but the difference was gone by the four-week follow-up.
So the chamomile record supports a mild, slow effect on sleep quality and on ongoing anxiety, and argues against a quick fix for insomnia or acute nerves. Applying even that much to a bare apigenin capsule is a further step the evidence has not taken.
Getting the Dose Right
The options run from free to deliberate, and the free one has as much human evidence behind it as anything else here. Chamomile tea is where most of the trials started, so it is the reasonable first move; the isolated capsule is the popular option that outruns its testing.
Ways to Do It
Start with chamomile tea. It carries the evidence, costs almost nothing, and is a calming evening ritual whatever the active compound turns out to be worth.
This is the food-first route and the one most of the human trials used. A bag or a spoon of dried German chamomile flowers steeped for several minutes makes a warm, calming drink for the hour before bed. In the trials chamomile tea and extract improved self-rated sleep quality over a couple of weeks. It is inexpensive, pleasant, and the ritual of a warm drink and winding down is part of the effect.
If you want a measured, consistent dose, a chamomile extract standardized to its apigenin content is closest to what the anxiety and sleep trials actually tested. The generalized-anxiety trial escalated up to about 1100 mg a day of a 1.2% apigenin extract, and the elderly-sleep trial used 400 mg a day. This is the version with trial support behind it, as distinct from the isolated compound.
The popular sleep-stack option, usually around 50 mg. It rests on the receptor mechanism and on the chamomile trials rather than on any trial of the isolated supplement, which has not been done. If you try it, treat it as an experiment on yourself: it is well tolerated, and the fair expectation is a mild calming effect at most, not a reliable sleep aid.
Supplements are loosely regulated, and what is in the capsule is not always what is on the label. Choosing a product that carries an independent testing mark, such as NSF or Informed Choice, is the simplest way to confirm it holds what it claims and is free of contaminants. There is no premium apigenin worth paying up for.
Go Deeper
- Insomnia: what the evidence actually supports for trouble sleeping, and where a mild calming aid like chamomile fits among stronger options.
- L-theanine: another gentle calm-and-focus supplement with a similar evidence shape, small trials and a modest effect.
- Magnesium: a food-first mineral often reached for at bedtime, and what the sleep evidence for it looks like.
- CBT-I: the behavioral approach with the strongest evidence for fixing chronic insomnia at the root.
The Chinese Medicine View
Apigenin was isolated in the modern laboratory, so the compound has no place in the classical Chinese pharmacopoeia. Chamomile, the plant it comes from, is also largely absent: German chamomile is a European herb, not part of the classical Chinese materia medica, and claiming otherwise would be an invention. What the tradition offers here is a way of thinking, laid over the plant as interpretation, not a lineage the herb actually has.
Read through that lens, a mild, cooling, calming flower taken to settle the mind before sleep sits near what the tradition calls calming the Shen, the spirit or mind that is said to reside in the Heart and to become unsettled in states of worry and restless sleep. Chinese medicine has its own herbs for that work, such as suan zao ren (sour jujube seed), and a practitioner reasoning in this framework would reach for those, chosen to the person, rather than for chamomile.
The tradition would also caution against treating any calming herb as universally suitable. A cool, downward-settling substance suits someone agitated and warm more than someone who already runs cold or whose digestion is weak, and restless sleep in this framework has several distinct patterns, each calling for a different remedy. The mapping is a bridge for a reader who thinks this way, offered to connect apigenin to the rest of the library. It is not evidence, and it does not lend the supplement authority the trials have to earn on their own.
Cautions For This Practice
Everything to be aware of is here, in one place. This practice suits most healthy people; a few situations call for real care.
Chamomile caused only mild side effects in trials, similar to placebo
Across the randomized trials in the systematic review, chamomile was well tolerated: only mild adverse events were reported, and in the controlled trials the rate was similar to placebo. Chamomile tea and extract have a long record of ordinary dietary use. Good tolerability in short trials of chamomile does not cover isolated apigenin at higher supplement doses, allergic reactions in sensitized people, or long-term use, none of which the trials were built to detect.Systematic review and meta-analysis: therapeutic efficacy and safety of chamomile for state anxiety, generalized anxiety disorder, insomnia, and sleep quality
Chamomile can trigger allergic reactions, including rare anaphylaxis, in people allergic to ragweed and related plants
Chamomile is in the Asteraceae (daisy) family, and case reports document allergic reactions to it, including rare severe anaphylaxis after chamomile tea. Cross-reactivity has been demonstrated with the pollens of ragweed and mugwort, so people allergic to those plants are the ones most at risk. Severe reactions are rare and documented mainly in case reports rather than measured in trials, so the true frequency is unknown; the risk concentrates in people already allergic to ragweed and related plants.Subiza et al., Anaphylactic reaction after the ingestion of chamomile tea: a study of cross-reactivity with other composite pollensKljucevsek et al., Allergic potential of medicinal plants from the Asteraceae family
A case report links chamomile with a dangerous rise in INR and bleeding on warfarin
A published case report describes a 70-year-old woman on stable warfarin who developed multiple internal hemorrhages and a markedly elevated INR (7.9) after using chamomile products, with the interaction attributed to chamomile's coumarin constituents potentiating the anticoagulant. This is a single case report, which cannot prove cause on its own, but chamomile contains coumarins and the mechanism is plausible, so anyone on warfarin or another anticoagulant has reason to be cautious.Segal and Pilote, Warfarin interaction with Matricaria chamomilla
Allergy, especially if you react to ragweed
Chamomile is in the daisy (Asteraceae) family, and people allergic to ragweed, mugwort, or related plants can react to it. Reactions are usually mild, but rare severe anaphylaxis after chamomile tea has been documented. If you have a known allergy to those pollens or plants, be cautious with chamomile in any form, and stop at any sign of a reaction such as hives, swelling, or trouble breathing.
If you take warfarin or another blood thinner
Chamomile contains coumarins, and a case report describes a person on stable warfarin who developed serious bleeding and a very high INR after adding chamomile products. One case does not prove the interaction, but the mechanism is plausible. If you take warfarin or another anticoagulant, mention chamomile or apigenin to the clinician who manages it before adding it.
Pregnancy and breastfeeding are not well studied
There is not enough safety data on concentrated chamomile or apigenin supplements in pregnancy or breastfeeding, and chamomile has a traditional reputation for affecting the uterus. Ordinary chamomile tea is a much smaller amount, but for a concentrated supplement while pregnant or nursing, check with a clinician first.
It is a mild aid, not a treatment for a disorder
The effect measured for chamomile is a mild steadying and a small gain in sleep quality over weeks. Significant or persistent insomnia, anxiety, or low mood is something a clinician can assess and treat, and neither chamomile nor apigenin is a substitute for that care. Use it for what it does, and get the larger problem looked at.
Sedatives and around surgery
Because apigenin acts on the same calming receptor as sedative drugs, it is sensible to be cautious about combining it with prescription sedatives or alcohol, and to tell your care team about any supplement before a planned surgery, since it is simple to pause beforehand.
Start slow, be smart, read the research, and consult a professional if you have any concerns. This is here to inform your choice, not make it for you.
Common Questions
Does apigenin actually help you sleep?
It might help a little, and it has not been properly tested. No human trial has tested an isolated apigenin capsule for sleep. The evidence comes from chamomile, which contains apigenin: across small trials chamomile improved self-rated sleep quality by a moderate amount over a couple of weeks, but a trial in people with diagnosed insomnia found no change in any sleep measure. So the fair expectation is a mild calming effect at most, not a reliable sleep aid.
Is apigenin the same as chamomile?
No. Apigenin is one flavonoid found in chamomile. Chamomile tea and chamomile extract deliver apigenin along with many other compounds, and nearly all the human research is on the whole plant, not the isolated compound. That is why a benefit found for chamomile cannot be credited to apigenin alone, and why a cup of chamomile tea has as much trial support behind it as the isolated capsule does.
How does apigenin work?
It binds the benzodiazepine site of the GABA-A receptor, the brain's main calming system and the same site valium-type drugs act on, though far more weakly. That is the real basis for its calming reputation. The step that has not been shown is whether a swallowed capsule delivers enough apigenin past the gut and liver and into the brain to matter, since apigenin is poorly absorbed.
How much apigenin should I take, and is it safe?
Isolated apigenin capsules are usually around 50 mg, a dose based on custom rather than on any trial. Chamomile extracts standardized to apigenin, at 400 mg a day up to about 1100 mg a day, are what the sleep and anxiety trials used. Chamomile is well tolerated, with only mild side effects in trials.
The specific cautions are allergy in people sensitive to ragweed and related plants, a possible interaction with warfarin, and a lack of safety data in pregnancy and breastfeeding.
Why is apigenin in so many sleep supplements if the evidence is thin?
It became popular through widely shared evening supplement stacks, on the strength of its receptor mechanism and chamomile's long calming reputation. Both of those are real, which is why it is a reasonable thing to try. What is missing is a trial of the isolated supplement itself, so its place in those stacks runs ahead of what has actually been measured.
Explore Related
Other pages this one connects to, by the evidence they share, the outcomes they touch, and the ground they cover.
All 14 sources on this page independently checked and cross-referenced.
Thomas Dehli, Founder & Editor, Sacred Lotus
Sacred Lotus has published Chinese medicine reference material since 2001. Integrative pages are held to the same standard as the herb and formula library: cite the source, grade the claim at its real strength, and say where the research has not looked. This page is educational and it is not medical advice. Last reviewed and updated August 15, 2026.
Evidence strength
How confidently the research supports a claim. Strength describes the evidence, not our endorsement.