Apigenin is a flavonoid found naturally in chamomile, parsley, and celery. It has attracted interest for its potential to support sleep onset, reduce anxiety, and promote cellular health: properties linked to its ability to bind benzodiazepine sites on GABA-A receptors and inhibit certain cell-cycle kinases. As demand has grown, so has the number of products on store shelves, and not all of them deliver what the label promises.
Reading a supplement label sounds straightforward, but apigenin products present specific challenges: the compound is often extracted from chamomile at varying purities, dosages range widely across products, and third-party testing is inconsistently applied. This guide walks through every section of a typical apigenin label so you can make an informed purchase decision, and spot the warning signs that a product is not worth your money or your trust.
Key Takeaways
- Always look for a standardized purity percentage (ideally 95 to 98% apigenin) rather than a generic ‘chamomile extract’ listing with no standardization figure.
- Legitimate third-party testing means a COA from a named, accredited independent lab with lot number, test date, HPLC potency data, heavy metal results, and microbial limits, not just a logo or marketing claim.
- Proprietary blends hide individual ingredient amounts; choose products that list apigenin as a standalone ingredient with its exact milligram dose disclosed.
- Apigenin inhibits CYP1A2, CYP2C9, and CYP3A4: a responsible label discloses this interaction risk, especially for users on warfarin, statins, or sedative medications.
- Red flags include missing lot numbers, no expiration date, disease treatment claims, and refusal to provide a verifiable COA.
Understanding Apigenin Purity: What the Percentage Actually Means
The most important number on any apigenin label is the purity percentage listed for the ingredient itself, often expressed as ‘Apigenin 98%’ or ‘Apigenin (from chamomile extract, standardized to 98% apigenin).’ This figure tells you how much of the powder in the capsule is actually apigenin versus other plant compounds, fillers, or residual extraction solvents. A product listing only ‘chamomile extract’ without a standardization percentage may contain very little apigenin, since the extract used in human trials is often about 1% apigenin by mass (0.8 to 1.2%) [6].
Higher purity (95 to 98%+) is generally preferable for consistent dosing. However, purity alone does not guarantee identity or safety. A label can accurately state 98% purity while the underlying raw material was sourced from a supplier that does not test for heavy metals, pesticide residues, or microbial contamination. Purity tells you concentration; third-party testing tells you safety. You need both.
For chamomile-derived products, note that the pharmacopoeia minimums are set for apigenin 7-glucoside, not free apigenin: 0.25% in the European Pharmacopoeia and 0.3% in the US pharmacopoeia. A review also gives about 0.25% apigenin glucoside by dry flower weight in chamomile extract [13][14].
Watch out for vague language like ‘high potency apigenin’ or ‘concentrated chamomile complex’ with no standardization figure. These phrases have no regulatory definition and allow manufacturers to omit information that would otherwise let you compare products on equal terms.
Decoding the Supplement Facts Panel
The Supplement Facts panel is the standardized box required by the FDA on all dietary supplements sold in the United States. For apigenin, look at the serving size, the amount of apigenin per serving in milligrams, and the ‘other ingredients’ list. Doses on commercial labels commonly run from 25 mg to 100 mg, but the best human dose of apigenin has not been established and no official recommended daily allowance exists [7]. A label listing 50 mg per capsule with one capsule per serving is straightforward; a label listing 500 mg of ‘chamomile flower extract (2% apigenin)’ actually delivers only 10 mg of the active compound: a meaningful difference that easy math can reveal.
Research note: The European Pharmacopoeia sets a minimum of 0.25% apigenin 7-glucoside in chamomile flowers, as cited by the authors (who say their sample met it) [12].
The ‘other ingredients’ section lists everything else in the capsule: fillers, binders, flow agents, and the capsule shell material. Common fillers like microcrystalline cellulose and rice flour are benign. Watch for unnecessary additives such as artificial dyes, titanium dioxide, or proprietary blends that fold multiple active compounds together without disclosing individual amounts. If you are sensitive to gluten, soy, or dairy, confirm the label explicitly states ‘free from’ these allergens or check the certificate of analysis for allergen testing.
Third-Party Testing: What Certifications to Look For and What They Mean
Third-party testing means an independent laboratory, not the manufacturer, has analyzed the product and confirmed it meets specified standards. This is voluntary in the U.S. supplement market, which makes it a strong signal of quality when present. The most rigorous certifications are USP Verified, NSF Certified for Sport, and Informed Sport/Informed Choice. Each requires periodic re-testing, facility audits, and chain-of-custody documentation. If a product carries one of these seals, it has cleared a meaningful bar.
A step below full certification but still valuable is a Certificate of Analysis (COA) from an accredited third-party lab such as Eurofins, ChromaDex, or Covance. A COA should specify the test date, lot number, the methodology used (typically HPLC for flavonoid quantification), and results for identity, potency, heavy metals (lead, mercury, cadmium, arsenic), and microbial limits. Reputable brands post COAs on their website or provide them on request. If a company refuses to share a COA or only offers one generated by their own in-house lab, treat that as a significant red flag.
Be skeptical of seals that look official but are not backed by audited standards. Phrases like ‘lab tested,’ ‘quality verified,’ or ‘purity guaranteed’ without naming the testing body or providing a verifiable COA are marketing language, not certification. A genuine NSF or USP seal will include a license number you can verify directly on the certifying organization’s website.
Common Red Flags on Apigenin Labels
Proprietary blends are one of the most common ways manufacturers obscure dosing. If you see ‘Sleep Support Blend 300 mg’ listing apigenin alongside five other compounds, you have no way of knowing whether the product contains 200 mg of apigenin or 5 mg. For a compound where dose matters for the intended effect, this lack of transparency makes it impossible to use the product rationally or to compare it with research findings.
Exaggerated health claims are both a regulatory violation and a quality signal. Under U.S. law, dietary supplements cannot claim to diagnose, treat, cure, or prevent disease. Labels that claim apigenin ‘cures insomnia,’ ‘eliminates cancer risk,’ or ‘reverses aging’ are making illegal disease claims, and a company willing to violate labeling law is unlikely to be rigorous about manufacturing standards. Legitimate structure-function claims sound like ‘supports relaxation’ or ‘promotes healthy sleep,’ not therapeutic absolutes.
Missing lot numbers and expiration dates are practical red flags. Lot numbers allow traceability back to raw material testing; without one, a COA is unverifiable. Expiration dates matter because flavonoids degrade over time, particularly when exposed to heat, humidity, or light. A product with no expiration date provides no assurance that the apigenin content stated on the label is still accurate at the time of purchase.
Drug Interactions and Safety Disclosures: What a Responsible Label Includes
A high-quality apigenin label will include at minimum a general advisory to consult a healthcare provider before use, particularly for individuals who are pregnant, nursing, or taking prescription medications. This is not boilerplate; it reflects a real pharmacological concern. In laboratory assays, apigenin inhibits cytochrome P450 enzymes CYP1A2, CYP2C9, and CYP3A4, which help metabolize many common drugs including warfarin (blood thinner). These are enzyme-assay results at micromolar concentrations, and no clinical interaction study of apigenin is available, but the precaution is reasonable [8][3][2][4].
Apigenin binds a benzodiazepine site in rat brain tissue, so additive sedation when stacked with benzodiazepines, alcohol, melatonin, or other sleep-promoting compounds is a theoretical concern, although in cell studies it inhibited rather than enhanced GABA activation. A good label still names this precaution [9][10][11]. Look for a label that explicitly names categories of concern (anticoagulants, sedatives, CYP450-metabolized drugs) rather than offering only the generic ‘consult your doctor’ statement.
How to Use the Label Information to Compare Products
Once you understand each label element, comparing products becomes a straightforward exercise. Start by calculating the actual milligrams of apigenin per serving: divide the extract weight by the standardization percentage. Then check whether the brand provides a current, lot-specific COA from a named accredited lab. Note whether the purity figure is supported by HPLC methodology (the gold standard for flavonoid quantification) versus generic ‘spectrophotometric assay,’ which is less specific. Finally, read the other ingredients and the warnings section to assess transparency.
Price is a useful secondary signal. Genuine 98% pure apigenin from a reputable raw material supplier costs more than low-purity chamomile extract. A product priced significantly below the market average for the same stated dose is often achieving that savings through inferior raw materials, lack of testing, or inaccurate labeling. This does not mean the most expensive product is the best, but implausibly cheap pricing warrants extra scrutiny of the COA.
🛒 Where to Buy Apigenin
- Momentous Apigenin
capsules, 50 mg per capsule, 60 count: NSF Certified for Sport, meaning batch testing against a banned-substance list and verification that the label matches the contents - Vitamatic Apigenin 50mg
capsules, 50 mg per capsule, 120 vegetarian capsules: The lowest cost per dose on this list, and a vegetarian capsule if gelatin is a constraint; the listing states no third-party certification - Nutricost Apigenin 50mg
capsules, 50 mg per capsule, 180 count: Non-GMO, gluten free and vegan, and the best cost per capsule among the larger bottles here - Swanson Apigenin 50mg
capsules, 50 mg per capsule, 90 count: A long-established supplement brand, in the smaller 90-count bottle; the listing frames it around sleep and relaxation
As an Amazon Associate we earn from qualifying purchases. Apigenin products differ mainly in what else is in the capsule (some are plain apigenin, others blend it with L-theanine, valerian root or magnesium) so check the label for the actual apigenin dose per serving, and prefer products that publish third-party testing.
A Note on the Evidence
Most of what appears above (cGMP manufacture, certificates of analysis, third-party testing, label accuracy) is regulatory and manufacturing practice rather than a clinical question, so it is not the kind of claim a trial settles. Two things on this page are empirical, though, and both have published sources. On absorption, one human study in healthy men is instructive. Apigenin taken as the free aglycone was poorly absorbed, with urinary metabolites equal to 0.5% of the dose over 24 hours. In the same study, the apigenin glycoside in a parsley drink gave metabolites equal to 11.2% of intake and chamomile tea gave 34% [1]. Taking dried parsley with yogurt pushed peak plasma concentration from four hours out to six. The practical reading is cautious: these are urinary recovery figures from a single study, so they show that chemical form matters but do not show how much of any capsule is absorbed [1].
Apigenin is a well-documented inhibitor of several drug-metabolizing cytochrome P450 enzymes in laboratory systems: CYP1A2 [2], CYP2C9 (where it inhibited losartan metabolism in human liver microsomes with an IC50 of about 4 micromolar) [3], and CYP3A4 [4]. It is worth being precise about what that does and does not establish. These are in vitro findings, and the authors of one of them note directly that such data cannot tell you whether a meaningful blockade occurs in people at dietary intakes [5]. No human drug-interaction study of apigenin supplementation has been published. What follows is therefore a precaution rather than a demonstrated risk, but with warfarin, certain statins and benzodiazepines the consequences of being wrong are asymmetric, which is why it stands. These statements have not been evaluated by the FDA; apigenin is not intended to diagnose, treat, cure, or prevent any disease. Anyone taking prescription medication, pregnant, nursing, or managing a chronic condition should consult a qualified healthcare provider before use.
Frequently Asked Questions
What does '98% apigenin' on a label actually mean?
It means that 98% of the powder by weight is the apigenin molecule (4′,5,7-trihydroxyflavone), with the remaining 2% comprising other plant compounds, extraction residues, or flow agents. The label does not say how that purity was reached. Chamomile flowers hold mostly apigenin glycosides, with only small amounts of free apigenin, so ask for a CoA that states the method and the source [12]. Higher purity allows more predictable dosing because you know nearly all the milligrams you are taking are the active compound.
Is a company's in-house lab test acceptable as proof of quality?
In-house testing has an obvious conflict of interest: the manufacturer tests its own product. While many companies do perform internal quality checks as part of good manufacturing practice, in-house results alone are insufficient proof of purity or safety. An independent, accredited third-party laboratory has no financial stake in the outcome, making its COA far more credible. Always look for external lab documentation.
Why does apigenin interact with so many medications?
In laboratory assays, apigenin inhibits several cytochrome P450 liver enzymes, specifically CYP1A2, CYP2C9, and CYP3A4, which help break down many prescription and over-the-counter drugs. If that happened in people, the drugs these enzymes normally metabolize would be cleared more slowly, but no clinical interaction study of apigenin is available [8][3][2][4]. This is particularly important for drugs with narrow therapeutic windows, such as warfarin, certain antiepileptics, and some statins.
Can I take apigenin with melatonin or a sleep stack?
Caution is warranted. Apigenin binds a benzodiazepine site in rat brain tissue, although in cell studies it inhibited rather than enhanced GABA activation, so combining it with other sedative compounds, including melatonin, valerian, alcohol, or prescription benzodiazepines, could in theory produce additive central nervous system depression [9][10][11]. This does not mean the combination is always harmful, but it does mean you should start with lower doses, avoid driving or operating machinery, and discuss the combination with a healthcare provider if you take any sedative prescription medication.
What is the difference between a USP Verified seal and an NSF Certified for Sport seal?
Both are rigorous third-party certification programs, but they target different use cases. USP Verified confirms that a product meets pharmaceutical-grade standards for identity, potency, purity, and dissolution, and is most relevant for general consumers. NSF Certified for Sport adds testing specifically for substances banned in competitive athletics and is most relevant for competitive athletes subject to anti-doping rules. For a typical apigenin user, either certification is a strong quality indicator; NSF Certified for Sport provides additional assurance against contamination with undisclosed stimulants or anabolic compounds.
How long does apigenin remain potent in a supplement?
Flavonoids like apigenin degrade when exposed to heat, light, moisture, and oxygen. Most manufacturers specify a shelf life of 18 to 24 months from the date of manufacture when stored in a cool, dry place away from direct light. Capsule or tablet forms in opaque, sealed containers degrade more slowly than powders exposed to air. An expiration date on the label is the manufacturer’s commitment that potency meets the stated amount until that date under recommended storage conditions; products without an expiration date offer no such assurance.
References
- Borges G et al. Absorption, distribution, metabolism and excretion of apigenin and its glycosides in healthy male adults. Free Radic Biol Med (2022). PMID 35452808
- Shimada H et al. Differential mechanisms for the inhibition of human cytochrome P450 1A2 by apigenin and genistein. J Biochem Mol Toxicol (2010). PMID 20806393
- Wang Z et al. Inhibitory Effect of Apigenin on Losartan Metabolism and CYP2C9 Activity in vitro. Pharmacology (2016). PMID 27287328
- Kondža M et al. Characterization of the CYP3A4 Enzyme Inhibition Potential of Selected Flavonoids. Molecules (2021). PMID 34069400
- Steuck M et al. Food Polyphenol Apigenin Inhibits the Cytochrome P450 Monoxygenase Branch of the Arachidonic Acid Cascade. J Agric Food Chem (2016). PMID 27933871
- Kramer DJ et al. Apigenin: a natural molecule at the intersection of sleep and aging. Frontiers in nutrition (2024). PMID 38476603
- Yajie Xu et al. Protective Roles of Apigenin Against Cardiometabolic Diseases: A Systematic Review. Frontiers in Nutrition (2022). PMID 35495935
- Fei Lin et al. Inhibitory effect of Selaginella doederleinii hieron on human cytochrome P450. Frontiers in Pharmacology (2023). PMID 36874034
- 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
- Goutman JD et al. Flavonoid modulation of ionic currents mediated by GABA(A) and GABA(C) receptors. European journal of pharmacology (2003). PMID 12586201
- 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
- Sah A et al. A Comprehensive Study of Therapeutic Applications of Chamomile. Pharmaceuticals (Basel, Switzerland) (2022). PMID 36297396
- Steven Suryoprabowo et al. The advantages of chamomile (Matricaria recutita) extract for health: a review. Exploration of Foods and Foodomics (2026). doi:10.37349/eff.2026.1010130
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.
