Luteolin
A flavone in celery, peppers, and artichoke that is among the strongest natural mast cell stabilizers, studied for allergies, 'brain fog', and neuroinflammation — mostly in cells and small open-label trials.
At a Glance
- Best known for
- Stabilizes mast cells and reduces histamine release, Anti-inflammatory in brain microglia (neuroinflammation), Antioxidant
- Evidence
- Preliminary
- Typical dose
- 100–200 mg daily
- Type
- Compound
What is Luteolin?
Luteolin is a yellow flavone closely related to apigenin, found in celery, green peppers, parsley, thyme, perilla, chamomile, and artichoke. It has long been used in traditional Chinese medicine (as a constituent of herbs like Perilla frutescens) for allergic and inflammatory conditions. Modern research focuses on two things: its unusually strong ability to prevent mast cells from dumping histamine and inflammatory cytokines, and its ability to calm microglia, the brain's immune cells, which has made it a candidate for conditions involving neuroinflammation such as autism spectrum disorder, mast cell activation syndrome, long COVID 'brain fog', and multiple sclerosis.
Known Health Benefits
How It Works
Luteolin inhibits mast cell degranulation more potently than the pharmaceutical mast cell stabilizer cromolyn in laboratory comparisons, blocking release of histamine, tryptase, IL-6, IL-8, and TNF. It does this partly by reducing calcium influx and partly by inhibiting the NF-κB and MAPK signaling pathways that drive cytokine production. In the brain, it suppresses microglial activation and the release of IL-1β and IL-6, protects the blood-brain barrier, and reduces oxidative stress through Nrf2 activation. It also inhibits the enzyme that converts cortisol to its active form in fat tissue and shows weak estrogen receptor and aromatase-inhibiting activity in cell studies, which is why some formulas target it at hormone-related inflammation.
What Research Says
The human evidence for luteolin is thin and mostly comes from one research group. An open-label 2013 pilot study gave 50 children with autism spectrum disorder a luteolin-quercetin-rutin formulation in olive oil for 26 weeks and reported improved social interaction and reduced irritability, but there was no placebo group. A small 2015 study of 'brain fog' in adults with mast cell activation found subjective improvement. A 2022 open-label study of a luteolin-based formula in people with long COVID olfactory loss reported faster smell recovery than olfactory training alone. None of these studies were blinded or placebo-controlled, so placebo effects cannot be ruled out. Cell and animal data for mast cell stabilization and neuroprotection are robust and reproducible, which is why luteolin remains an active research interest despite the lack of rigorous human trials.
Active Compounds
Luteolin (3',4',5,7-tetrahydroxyflavone) and luteolin-7-glucoside; often formulated with quercetin and rutin
Forms & Bioavailability
Luteolin is poorly water-soluble and heavily metabolized in the gut wall and liver, giving oral bioavailability in rodents of roughly 10–25%. Its glucoside form in foods is split by intestinal enzymes before absorption. Formulating it in olive oil or as a liposome markedly increases blood levels, and this is why the research formulations used in autism and brain fog studies were oil-based. Taking luteolin with a fat-containing meal is the simplest way to improve absorption. Peak blood levels occur about 1–2 hours after a dose, with conjugated metabolites persisting longer.
Dosage Guidance
| Use Case | Dosage |
|---|---|
| Allergy / histamine support | 100–200 mg daily |
| 'Brain fog' / neuroinflammation (studied formula) | 100 mg luteolin per 10 kg body weight in olive oil |
| Mast cell activation (adjunct) | 100–300 mg 2–3x daily |
| General anti-inflammatory | 100 mg daily |
Always consult a healthcare provider for personalized dosing.
Natural Food Sources
- Celery and celery seed (among the richest sources)
- Green bell peppers, chili peppers
- Fresh parsley, thyme, oregano, peppermint
- Artichoke
- Perilla leaf (shiso)
- Chamomile and dandelion tea
- Carrots, broccoli, cabbage (smaller amounts)
Potential Side Effects
Generally well tolerated; some reports of irritability or GI upset in children in autism studies; theoretical hormonal effects at high doses
Who Should Avoid It
- Warfarin or other anticoagulants (CYP2C9 inhibition and antiplatelet activity)
- Medications with narrow therapeutic windows metabolized by CYP3A4 (tacrolimus, cyclosporine)
- Hormone-sensitive conditions — weak estrogenic/aromatase effects in vitro warrant caution at high doses
- Scheduled surgery — stop 2 weeks before
Pregnancy & Lactation
Luteolin supplements have not been studied in pregnancy or breastfeeding. Its aromatase-inhibiting and weak estrogenic activity in cell studies is reason for caution. Avoid concentrated supplements; luteolin-rich foods such as celery, peppers, and herbs are safe.
Known Drug Interactions
Inhibits CYP3A4, CYP2C9 and CYP1A2 in vitro (affects warfarin, statins, some antidepressants, caffeine); additive with antihistamines; may enhance anticoagulant effect
Evidence Classification
Based on in vitro studies, animal models, pilot trials, or traditional use documentation. Clinical evidence is limited.
Frequently Asked Questions
Is luteolin better than quercetin for allergies?
In laboratory mast cell tests luteolin is somewhat more potent, but neither has been tested head-to-head in people with allergies, and quercetin has more human trial data overall. Many practitioners combine the two, which is what the main research formulations do. Luteolin's distinguishing feature is its activity on brain microglia, which quercetin lacks because it crosses the blood-brain barrier less readily.
Does luteolin help with 'brain fog'?
The idea is that brain fog in mast cell activation, long COVID, and some autoimmune conditions involves inflamed microglia and a leaky blood-brain barrier, both of which luteolin calms in animals. Human support comes from small open-label studies without placebo, so the honest answer is 'possibly, but unproven.' It is low-risk to try for 2–3 months with a fat-based formulation.
Why is luteolin sold in olive oil?
Luteolin dissolves poorly in water and is absorbed better in fat. The researchers who developed the autism and brain fog formulations used olive oil as the carrier specifically to improve absorption and because olive oil polyphenols like hydroxytyrosol have their own anti-inflammatory activity. Any fat-containing meal will help if you take a dry capsule.
Can luteolin affect hormones?
In cell studies luteolin inhibits aromatase (the enzyme that makes estrogen) and binds estrogen receptors weakly. In practice, food-level and typical supplement intake has not been shown to change hormone levels in people. High-dose use is best avoided by people with hormone-sensitive cancers or those on hormone therapy until this is better understood.
References
- Brain 'fog,' inflammation and obesity: key aspects of neuropsychiatric disorders improved by luteolin. Theoharides TC, Stewart JM, Hatziagelaki E, Kolaitis G. Front Neurosci (2015)
- A case series of a luteolin formulation (NeuroProtek®) in children with autism spectrum disorders. Theoharides TC, Asadi S, Panagiotidou S. Int J Immunopathol Pharmacol (2012)
- Luteolin as a therapeutic option for multiple sclerosis. Theoharides TC. J Neuroinflammation (2009)
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This entry is for educational purposes only. It is not medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen, especially if you take medications or have health conditions.