Apigenin (4′,5,7-trihydroxyflavone) is a naturally occurring flavonoid found in everyday plants including chamomile, parsley, celery, and certain teas. It is often named as a possible reason chamomile is used for calm, but researchers cannot say whether apigenin, other chamomile components, or both drive the effects seen in chamomile extract trials [7].
Over the past decade, apigenin has attracted growing scientific interest for reasons that go well beyond relaxation. Its proposed mechanisms span GABA-A receptor modulation, cyclin-dependent kinase inhibition, and modest CD38 inhibition, a pathway tied to cellular NAD+ availability. What follows is an honest, evidence-based look at what apigenin is, how it is thought to work, and where the research currently stands.
Key Takeaways
- Apigenin is a flavone polyphenol found in chamomile, parsley, and celery. It binds the benzodiazepine site in rat brain tissue, but in cell studies it reduced rather than boosted GABA responses, and the human sleep and anxiety trials used chamomile extract, not pure apigenin [4][5][6][7].
- It inhibits CDK2/CDK6 and modestly inhibits CD38, mechanisms under study in cancer-cell and NAD+ research respectively, but robust human clinical evidence remains limited.
- In a 2025 rodent study, apigenin suppressed NLRP3 inflammasome activation and promoted mitophagy in experimental spinal cord injury [1]; these are preclinical findings and do not establish human benefit.
- In laboratory assays apigenin inhibits CYP1A2, CYP2C9, and CYP3A4, which handle many drugs. No clinical interaction study of apigenin is available, so people taking warfarin, statins, benzodiazepines, or other medications processed by these enzymes should treat this as a precaution to raise with a pharmacist [8][9][10][11].
- Dietary apigenin from chamomile tea and whole foods is generally well tolerated; high-dose isolated supplementation carries a more meaningful safety and interaction profile that warrants medical review.
What Is Apigenin? Chemistry and Natural Sources
Apigenin belongs to the flavone subclass of polyphenols, characterised by a backbone of two benzene rings joined by a three-carbon bridge containing an oxygen atom. Its systematic name, 4′,5,7-trihydroxyflavone, reflects the three hydroxyl groups attached to that backbone. These structural features influence how the molecule interacts with enzymes and receptors throughout the body.
Dried chamomile flower (Matricaria chamomilla) is the best-known source, but its apigenin is mostly in glycoside forms, with only small amounts of free apigenin. A review of USDA data lists fresh parsley at 215.46 mg/100 g fresh weight, the highest value it reports. Food analyses use different units and methods, so figures from different studies should not be ranked against each other [12][13]. Other meaningful sources include fresh parsley, celery, thyme, peppermint, and certain citrus peels. Cooking and processing change the chemical form and stability of apigenin. In laboratory work on celery flavones, free apigenin was most stable at pH 3 and degraded progressively at pH 5 or 7 during heating. No study of how much apigenin is lost when food is boiled or dried is available [14].
How Apigenin Is Thought to Work: Key Proposed Mechanisms
Three mechanisms receive the most scientific attention. First, apigenin binds the benzodiazepine site on GABA-A receptors in rat brain tissue, with a Ki of 4 microM. Functional studies point the other way, though. In frog oocytes expressing human GABA-A receptors, apigenin alone inhibited GABA-induced activation (IC50 8 microM) and was not acting through the benzodiazepine site, and in injected rats it reduced movement without any anti-anxiety effect. These are micromolar cell concentrations and injected animal doses, not supplement doses [4][5][6][15].
Second, apigenin inhibits cyclin-dependent kinases 2 and 6 (CDK2/CDK6). These kinases normally drive cells through the G1/S checkpoint of the cell cycle; blocking them can push rapidly dividing cells toward cycle arrest or apoptosis. This mechanism forms the basis of most apigenin research in oncology contexts.
Third, apigenin modestly inhibits CD38, a NAD+-consuming enzyme. Because intracellular NAD+ levels tend to decline with age while CD38 activity rises, suppressing CD38 is one proposed strategy for slowing that decline. In a purified human CD38 enzyme assay apigenin inhibited CD38 with an IC50 of 10.3 micromol/L, a test-tube concentration. In obese mice, daily injections lowered liver CD38 activity and raised liver NAD+. No human NAD+ data for apigenin are available [16].
Apigenin and Relaxation: The GABA-A Connection
Chamomile’s calming reputation is often linked to apigenin, but researchers cannot say whether the effects seen in chamomile extract trials come from apigenin, other components, or both. In cell studies apigenin did not behave like diazepam: it inhibited rather than enhanced GABA responses, although at 1 microM it boosted diazepam’s enhancement of the GABA response by up to 22% [7][5].
In the chamomile insomnia pilot, each 90 mg capsule of dry extract contained 3.9 mg of apigenin
Chamomile extract trials test a modest amount of apigenin per capsule inside a whole extract, not a standalone apigenin dose.
Capsule analysis from a trial of 34 adults with insomnia. The dose was described as 270 mg of chamomile twice a day. Source: Zick et al., BMC complementary and alternative medicine 2011; Conti et al., Nutrition reviews 2026
Data table
| Item | Value |
|---|---|
| Dry chamomile extract in one capsule | 90.0 mg |
| Apigenin in that capsule | 3.9 mg |
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Research note: In a pilot trial of chamomile extract for primary insomnia, the 270 mg daily-twice dose came as 3 capsules of 90 mg dry extract, each containing 3.9 mg apigenin [21].
Whether apigenin carries the muscle relaxation, amnesia, or dependency risks of pharmaceutical benzodiazepines has not been tested in people. In mice, apigenin showed anti-anxiety activity without sedation or muscle relaxation, but in rats injected apigenin reduced movement without an anti-anxiety effect. Additive sedation with alcohol, prescription benzodiazepines, sleep medications, or melatonin is a theoretical concern rather than a measured one [4][15]. Anyone currently prescribed these agents should discuss apigenin supplementation with their physician before starting.
Human sleep data do not yet show a benefit from apigenin. In a two-week trial in 103 healthy adults, an evening blend of magnesium L-threonate, L-theanine and 50 mg apigenin did not produce significant improvements, while a morning ashwagandha and Rhodiola blend did. A chamomile extract trial in 34 adults with chronic insomnia also found no significant effect on sleep diary measures [19][20].
Apigenin, Inflammation, and Cellular Housekeeping
Apigenin has demonstrated anti-inflammatory activity across multiple laboratory models. One notable area of study involves the NLRP3 inflammasome, a multi-protein complex that triggers a highly inflammatory form of cell death called pyroptosis. In a 2025 animal study, apigenin was found to suppress NLRP3 inflammasome activation and pyroptosis while simultaneously promoting mitophagy, a cellular housekeeping process that removes damaged mitochondria. This was associated with improved functional recovery in rats with experimental spinal cord injury [1].
These are preclinical findings in rodents, not clinical evidence in humans. They point to plausible mechanisms, but translating animal results to human benefit requires well-controlled clinical trials that have not yet been completed for most of these pathways.
Apigenin and Cancer Cell Research
Laboratory studies consistently show that apigenin can inhibit the proliferation of various cancer cell lines and promote apoptosis, largely through CDK inhibition and interference with pro-survival signalling. Research investigating natural products including apigenin in cancer cell lines has found that the epithelial-to-mesenchymal transition (EMT) status of cells, a marker associated with metastatic potential, does not substantially alter their sensitivity to apigenin’s cytotoxic effects [2]. This suggests the compound’s activity is relatively broad across cell phenotypes in culture.
In vitro cytotoxicity in a laboratory dish is not evidence of cancer treatment efficacy in humans. The concentrations required to produce these effects are frequently far higher than those achievable in human tissue through oral supplementation. Apigenin is not a proven anti-cancer agent, and anyone facing a cancer diagnosis should rely on oncology-guided care rather than supplements.
Bioavailability, Drug Interactions, and Safety
Pure apigenin is poorly absorbed: in healthy men, urinary metabolites over 24 hours equalled only 0.5% of the dose. Absorption depends on the form eaten. The glycoside in chamomile tea peaked in plasma at 2 hours, pointing to upper gut absorption, with urinary excretion equal to 34% of intake, while a parsley drink peaked at 4 hours with 11.2%. These figures come from one human study and cannot be pooled with other food analyses [17].
The most clinically significant safety concern is cytochrome P450 inhibition. In laboratory assays apigenin inhibits CYP1A2, CYP2C9, and CYP3A4, enzymes that metabolise many drugs. The best-defined example is losartan, whose metabolism apigenin slowed in human liver microsomes (IC50 4.10 micromolar). These are enzyme-assay concentrations, not supplement doses, and no clinical interaction study of apigenin is available. A review also notes that apigenin modulates P-glycoprotein and CYP3A4 [9][10][11][18][8]. Anyone on anticoagulants, statins, benzodiazepines, or narrow-therapeutic-index medications should consult their physician before taking concentrated apigenin supplements.
Separately, laboratory research has shown that apigenin can inhibit Akt phosphorylation in endothelial cells, with the structural features of the molecule influencing the degree of inhibition [3]. Akt is a central node in cell survival signalling, so this finding is relevant both to understanding apigenin’s potential therapeutic effects and to flagging possible interactions with therapies that also target the Akt/PI3K pathway.
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The Polyphenol Family: A Structural Overview
Polyphenols are plant-derived compounds defined by having multiple phenol rings: benzene rings with hydroxyl groups attached. This structural feature gives them chemical reactivity that has made them subjects of extensive nutritional and pharmacological research. The polyphenol family is broad enough to encompass resveratrol in red wine, curcumin in turmeric, and the tannins in tea and coffee.
Within polyphenols, the largest and most studied subgroup is the flavonoids. Flavonoids share a core scaffold: two benzene rings (designated A and B) connected by a three-carbon bridge that forms a central ring (C). How those rings are saturated, hydroxylated, or otherwise modified determines which subclass a molecule belongs to. Major flavonoid subclasses include flavonols (such as quercetin), flavones (such as apigenin), isoflavones (such as genistein), flavanones (such as naringenin), flavan-3-ols (such as catechins in green tea), and anthocyanins (the pigments in blueberries and red cabbage).
Each subclass has distinct chemistry that translates into different biological behavior. Lumping all of them together as ‘flavonoids’ or ‘antioxidants’ obscures meaningful differences. Understanding the taxonomy, polyphenol to flavonoid to specific subclass to individual molecule, is the foundation for reading the research accurately.
A Note on the Evidence
Most apigenin research is preclinical, conducted in cell cultures or rodents, and the handful of human studies are small; effects in healthy adults at supplement doses remain incompletely characterised. CYP1A2, CYP2C9, and CYP3A4 inhibition has been shown only in laboratory assays, but individuals taking warfarin, narrow-therapeutic-index medications, benzodiazepines, or certain statins should still consult a qualified healthcare provider before using concentrated apigenin supplements [8][9]. These statements have not been evaluated by the FDA; apigenin is not intended to diagnose, treat, cure, or prevent any disease.
Frequently Asked Questions
What foods contain the most apigenin?
Dried chamomile flower is the best-known source, with most of its apigenin in glycoside forms. A review of USDA data lists fresh parsley at 215.46 mg/100 g fresh weight. Food analyses use different units and methods, so figures from different studies should not be ranked against each other, and no study of apigenin loss from boiling or drying is available [12][13].
Does apigenin actually help with sleep?
Not shown in people. Apigenin binds the benzodiazepine site in rat brain tissue, but in cell studies it inhibited rather than enhanced GABA activation. In a two-week trial in 103 healthy adults, an evening blend containing 50 mg apigenin did not produce significant improvements, and a chamomile extract trial in 34 adults with chronic insomnia found no significant effect on sleep diary measures. Pure oral apigenin has not been tested for sleep on its own, and combining it with other sedatives including melatonin or alcohol could theoretically add to sedation [4][5][19][20].
Can apigenin raise NAD+ levels?
Apigenin modestly inhibits CD38, an enzyme that consumes NAD+. In theory this could help slow age-related NAD+ decline. However, the evidence for meaningful NAD+ elevation in humans at typical supplement doses is not well established, and apigenin should not be treated as a direct equivalent to NAD+ precursors such as NMN or NR.
Is it safe to take apigenin every day?
Dietary apigenin through chamomile tea and whole foods has a long history of use with a good general safety record at normal intake levels. Concentrated supplement doses introduce more uncertainty, particularly around CYP enzyme inhibition that can elevate levels of co-administered drugs. People taking warfarin, certain statins, or psychiatric medications should consult a physician before starting regular supplementation.
Does apigenin have anti-cancer properties?
Laboratory studies show that apigenin inhibits cell-cycle progression and promotes apoptosis in cancer cell lines, and one study found this cytotoxic activity was not substantially altered by the EMT status of the cells [2]. These are in vitro findings from cell culture experiments. Apigenin has not been established as an effective cancer treatment in humans and should never replace standard oncology care.
What does apigenin do for inflammation?
In a 2025 preclinical study in rats, apigenin suppressed NLRP3 inflammasome activation and the inflammatory cell-death process called pyroptosis, while promoting mitophagy and aiding functional recovery after spinal cord injury [1]. These are animal findings and cannot be directly applied to human inflammatory conditions without further clinical investigation.
References
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- Kucukkaraduman B et al. Epithelial-to-Mesenchymal Transition Is Not a Major Modulating Factor in the Cytotoxic Response to Natural Products in Cancer Cell Lines. Molecules (Basel, Switzerland) (2021). PMID 34641401
- Dirimanov S et al. Screening of Inhibitory Effects of Polyphenols on Akt-Phosphorylation in Endothelial Cells and Determination of Structure-Activity Features. Biomolecules (2019). PMID 31195734
- Haydée Viola et al. Apigenin, a Component ofMatricaria recutitaFlowers, is a Central Benzodiazepine Receptors-Ligand with Anxiolytic Effects. Planta Medica (1995). PMID 7617761
- Campbell EL et al. The dietary flavonoids apigenin and (-)-epigallocatechin gallate enhance the positive modulation by diazepam of the activation by GABA of recombinant GABA(A) receptors. Biochemical pharmacology (2004). PMID 15451406
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- Fei Lin et al. Inhibitory effect of Selaginella doederleinii hieron on human cytochrome P450. Frontiers in Pharmacology (2023). PMID 36874034
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- Shimada H et al. Differential mechanisms for the inhibition of human cytochrome P450 1A2 by apigenin and genistein. Journal of biochemical and molecular toxicology (2010). PMID 20806393
- Kondža M et al. Characterization of the CYP3A4 Enzyme Inhibition Potential of Selected Flavonoids. Molecules (Basel, Switzerland) (2021). PMID 34069400
- Corina Danciu et al. Botanical Therapeutics: Phytochemical Screening and Biological Assessment of Chamomile, Parsley and Celery Extracts against A375 Human Melanoma and Dendritic Cells. International Journal of Molecular Sciences (2018). PMID 30453564
- Charrière K et al. Exploring the Role of Apigenin in Neuroinflammation: Insights and Implications. International journal of molecular sciences (2024). PMID 38732259
- Hostetler GL et al. Effects of food formulation and thermal processing on flavones in celery and chamomile. Food chemistry (2013). PMID 23790931
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- Carlos Escande et al. Flavonoid Apigenin Is an Inhibitor of the NAD+ase CD38. Diabetes (2012). PMID 23172919
- Borges G et al. Absorption, distribution, metabolism and excretion of apigenin and its glycosides in healthy male adults. Free radical biology & medicine (2022). PMID 35452808
- Roberto Cannataro et al. Polyphenols in the Mediterranean Diet: From Dietary Sources to microRNA Modulation. Antioxidants (2021). PMID 33672251
- Mastrofini GF et al. Modulating stress and sleep through a multi-compound dietary supplement: a randomized, double-blind, placebo-controlled trial. Journal of the International Society of Sports Nutrition (2026). PMID 42829807
- Atena Pasban et al. The Effect of Chamomile on Common Psychological Disorders Including Depression, Anxiety, Stress and Sleep Disorders: A Narrative Review. Iranian Journal of Psychiatry and Behavioral Sciences (2025). doi:10.5812/ijpbs-157547
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These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
