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Luteolin

Luteolin is a genuinely interesting anti-inflammatory flavone in cell and animal research with essentially no standalone human efficacy data. The human trials people cite are combination products where luteolin is the minor ingredient — and where it was tested alone, it failed.

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What the science says

  • Tested by itself against placebo, it did not work Limited evidence

    In a placebo-controlled crossover screening trial in 21 male veterans with Gulf War Illness, luteolin reduced symptom severity no more than placebo at either the lower (p = 0.72) or higher (p = 0.49) dose. Resveratrol, tested in the same protocol, did beat placebo at both doses (p = 0.035 and p = 0.004) — so the study was capable of detecting a signal, and luteolin did not produce one.

  • The positive human trials are combination formulas Limited evidence

    A 202-patient blinded multicentre randomized trial in persistent COVID-19 olfactory dysfunction found ultramicronized palmitoylethanolamide plus luteolin added to olfactory training beat either therapy alone — but PEA is the dominant, better-characterized active and typically supplies ten times the mass of luteolin. Similarly, 6-month RCTs of a chlorogenic acid plus luteolin nutraceutical improved cardiometabolic parameters in pre-obesity and metabolic syndrome. Neither design can attribute the benefit to luteolin.

  • The mast cell and neuroinflammation mechanism is preclinical only Limited evidence

    Luteolin inhibits mast cell mediator release and microglial activation in vitro — the basis for its marketing around "brain fog," histamine intolerance and autism. These effects appear at micromolar concentrations in cell culture; luteolin has poor water solubility and undergoes extensive glucuronidation and sulfation on first pass, so free plasma concentrations after an oral dose are far lower. Mechanism plausibility is not clinical evidence.

Dosage & safety

Studied doseHuman trials used roughly 100-500 mg/day, usually in liposomal or olive-oil-based formulations to work around poor solubility; PEA-luteolin products typically supply about 700 mg PEA with 70 mg luteolin daily. There is no established effective standalone dose because no adequate standalone trial has been done.
SafetyShort trials report no serious adverse events; GI upset is the usual complaint. Long-term safety is unstudied. As a flavone, luteolin inhibits CYP enzymes and sulfotransferases in vitro — use caution with narrow-therapeutic-index drugs. Flavones of this class show thyroid peroxidase inhibition in animal studies, so caution is warranted with thyroid disease. Not established in pregnancy or breastfeeding, and — importantly — not established in children despite luteolin blends being marketed for paediatric neurodevelopmental use, an area where parents deserve evidence rather than mechanism stories. Not banned in sport.

How to take it

TimingTiming does not matter.
With food?With a meal containing fat — luteolin is poorly water-soluble and the trials used liposomal or olive-oil-based formulations for that reason.
Worth knowingPlain luteolin powder is badly absorbed, so a cheap capsule and a formulated product are not interchangeable at the same milligram number.

Interactions

With medications

  • warfarin, some statins, immunosuppressants and other narrow-therapeutic-index drugs

    Luteolin inhibits CYP enzymes and sulfotransferases in vitro, which could raise their blood levels. ask a pharmacist before combining

  • levothyroxine and antithyroid drugs

    Flavones of this class inhibit thyroid peroxidase in animal studies. have thyroid function rechecked if you use it long term with thyroid disease

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does luteolin work?

There is essentially no standalone human evidence for luteolin, and the evidence is limited: when luteolin was tested alone against placebo in 21 veterans with Gulf War Illness, it did no better than placebo. Its anti-inflammatory effects come from cell and animal research.

Does PEA with luteolin help brain fog or loss of smell after COVID?

A 202-patient trial found palmitoylethanolamide (PEA) plus luteolin added to olfactory training helped post-COVID smell loss, but PEA is the dominant ingredient, supplying about ten times the mass of luteolin. The design cannot attribute the benefit to luteolin, and brain fog claims rest on cell-culture mechanisms.

How should I take luteolin for better absorption?

Take luteolin with a meal containing fat: it is poorly water-soluble, and human trials used roughly 100-500 mg/day in liposomal or olive-oil-based formulations. Plain luteolin powder is badly absorbed, so milligram amounts across products are not interchangeable.

Is luteolin safe with medications or thyroid disease?

Luteolin inhibits CYP enzymes and sulfotransferases in vitro, so ask a pharmacist before combining it with warfarin, statins or immunosuppressants. Flavones like luteolin inhibit thyroid peroxidase in animal studies, so have thyroid function rechecked if you have thyroid disease and use it long term.

Scientific references

Where to buy

Double Wood Supplements, Luteolin, 120 Capsules (50 mg per Capsule)

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