Hispidulin (Chamomile 6-Methoxyflavone · GABA-A Modulator · 5-LOX Inhibitor · Anticonvulsant)

Compound	Hispidulin (4’,5,7-Trihydroxy-6-methoxyflavone; Dinatin)
Chemical class	Polyphenol — Flavone (6-Methoxyflavone; scutellarein analogue)
CAS	1447-88-7
Primary source	Matricaria chamomilla (German chamomile), Salvia spp., Cirsium spp. (thistles)
Key applications	Anti-inflammatory; neuroprotective; anticonvulsant; anti-anxiety (GABA-A positive allosteric modulator); antifungal
Claim strength	Moderate
Typical form	Chamomile extract (hispidulin as minor constituent); sage extract; hispidulin isolate (research grade)
Buy from Herbuno	Chamomile Flower Extract Powder → Chamomile Flower Liquid Extract (Water Soluble) - Matricaria chamomilla →

Name origin: From Latin hispidulus (slightly hairy/bristly) — referring to the hairy-stemmed thistle species (Cirsium) from which it was prominently characterised. Also known as dinatin. Hispidulin is a 6-methoxyflavone — a flavone with a methoxy group at position 6 (on the A-ring between the 5-OH and 7-OH positions). This 6-methoxy substitution distinguishes it from scutellarein (same core structure without the 6-methoxy) and from apigenin (no methoxy at all), and confers its distinctive GABA-A allosteric modulating activity. Traditional use: Chamomile (Matricaria chamomilla) has millennia of traditional use across European, Middle Eastern, and Indian medicine for anti-inflammatory, anxiolytic, and antispasmodic applications — with hispidulin as one of the minor active flavonoids alongside apigenin (the primary chamomile flavone). Sage (Salvia) species containing hispidulin have traditional uses for memory support and anti-inflammatory conditions. Research trajectory: Hispidulin’s pharmacological profile has attracted specific interest for: (1) GABA-A positive allosteric modulation (anxiolytic/anticonvulsant without benzodiazepine side effects); (2) selective 5-LOX inhibition (anti-inflammatory); (3) neuroprotection and cognitive support. The 6-methoxy group appears to be the critical structural determinant for GABA-A activity relative to related flavones. Commercial source: Chamomile Flower Extract Powder from Herbuno delivers hispidulin as part of the chamomile flavonoid complex.

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Evidence for Hispidulin Applications

GABA-A positive allosteric modulation — anxiolytic/anticonvulsant: Hispidulin binds to the benzodiazepine binding site on GABA-A receptors as a partial positive allosteric modulator — enhancing GABA’s inhibitory effect without producing the full sedation, tolerance, or dependence risk of benzodiazepines. In animal models, hispidulin shows anxiolytic activity in the elevated plus maze and anticonvulsant activity in pentylenetetrazol seizure models. This GABA-A mechanism is the most pharmacologically distinctive property of hispidulin relative to common flavones. Claim strength: Moderate (animal; mechanism; no human RCTs).

Anti-inflammatory — 5-LOX inhibition: Unlike most flavones that are primarily COX inhibitors, hispidulin preferentially inhibits 5-lipoxygenase (5-LOX) — the leukotriene-producing enzyme targeted by boswellic acids. This 5-LOX preference gives hispidulin an anti-inflammatory profile relevant for asthma, allergy, and leukotriene-mediated inflammation. Claim strength: Moderate.

Neuroprotective and anticancer: Hispidulin induces autophagy in glioblastoma cells via AMPK/mTOR signalling — a distinct anticancer mechanism. In Alzheimer’s models, it reduces tau hyperphosphorylation and amyloid-beta toxicity. Claim strength: Emerging (preclinical).

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Frequently Asked Questions — Hispidulin

How does hispidulin differ from apigenin in chamomile?
Apigenin (4’,5,7-trihydroxyflavone) is the primary chamomile flavone — present at approximately 0.5–1% of dried chamomile flowers. Hispidulin (4’,5,7-trihydroxy-6-methoxyflavone) is a minor constituent at much lower concentrations. Both have GABA-A modulating activity and anti-inflammatory properties, but hispidulin’s 6-methoxy group gives it stronger and more selective GABA-A benzodiazepine site affinity relative to apigenin. In chamomile extract formulations, apigenin is the primary standardisation marker; hispidulin contributes synergistically at lower concentrations.

Is hispidulin effective for seizures?
In preclinical animal seizure models (pentylenetetrazol-induced), hispidulin shows significant anticonvulsant activity comparable to low-dose benzodiazepines in some models. The mechanism is confirmed GABA-A positive allosteric modulation. However, no human clinical trials for epilepsy or seizures have been conducted with hispidulin. It should not be used as a substitute for prescribed anticonvulsant medications. The preclinical anticonvulsant data make it scientifically interesting for research but clinical translation is not established.

What is the difference between hispidulin and scutellarein?
Scutellarein (4’,5,6,7-tetrahydroxyflavone) has an additional free 6-hydroxyl where hispidulin has a 6-methoxy group. This seemingly minor difference has significant pharmacological consequences: the 6-methoxy group of hispidulin confers selective GABA-A benzodiazepine binding that scutellarein (with a free 6-OH) lacks. Scutellarein is more antioxidant due to the additional phenolic hydroxyl; hispidulin is more GABA-A active due to the methoxy-enabled binding geometry.

Is chamomile extract a reliable source of hispidulin?
Chamomile extracts contain hispidulin at variable concentrations (typically 0.01–0.1% of dry extract weight) — much lower than apigenin content. Commercial chamomile extracts standardised to apigenin will contain hispidulin as a minor co-constituent but are not standardised to hispidulin specifically. For research or supplement applications targeting specific hispidulin content, request HPLC analysis quantifying hispidulin as a separate analyte. The amount of hispidulin in a standard chamomile supplement dose is likely below pharmacologically meaningful thresholds in most preparations.

Related compounds: Orientin, Apigenin, Luteolin, Scutellarein

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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