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Limited evidenceWeight management

Oleoylethanolamide (OEA)

A fat-derived signalling molecule the gut makes after a meal, sold as an appetite suppressant. Small human trials show changes in blood lipids and satiety hormones, but no convincing weight loss.

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What the science says

  • Appetite and body weight Limited evidence

    An RCT in obese people newly diagnosed with fatty liver reported modest reductions in weight and waist circumference alongside a calorie-restricted diet, and a later randomized trial found changes in self-reported dietary habits. Both were small, single-centre and used calorie restriction in both arms, so the independent effect of OEA is unclear.

  • Satiety hormone response Limited evidence

    A fixed-sequence crossover study in a small group of adults found that a single dose of an OEA ingredient raised incretin hormone responses after a meal. It was an acute mechanistic study with no clinical endpoints.

  • Blood lipids and glucose Limited evidence

    A randomized double-blind placebo-controlled trial in obese adults measured lipid profile and fasting blood sugar and found limited change. The evidence base is a handful of trials from a small number of research groups.

Dosage & safety

Studied doseTrials have used 125–250 mg/day of OEA-rich extract, usually before meals. Typical label doses are in the same range.
SafetyShort-term trials report no serious adverse events, but there is no long-term safety data. Not studied in pregnancy, breastfeeding, or in children; people on lipid-lowering or diabetes medication should discuss it with a doctor.

How to take it

TimingTaken 20 to 30 minutes before meals, which is how the trials dosed it.
With food?Take it before eating rather than with the meal, since it works through pre-meal satiety signalling.
Worth knowingMost products are an oleic-acid-rich extract rather than pure OEA, so check the actual OEA content rather than the total oil weight.

Frequently asked questions

Does OEA (oleoylethanolamide) help with weight loss?

Oleoylethanolamide (OEA) has limited evidence: small trials reported modest weight and waist reductions, but both arms also followed calorie restriction, so OEA's own effect is unclear. There is no convincing weight loss from OEA.

Does OEA reduce appetite?

In one small acute study, a single dose of an oleoylethanolamide ingredient raised post-meal incretin hormone responses, but no clinical endpoints were measured. The evidence that OEA reduces appetite is limited.

How much OEA should I take and when?

Oleoylethanolamide trials used 125–250 mg/day of OEA-rich extract, taken 20 to 30 minutes before meals. Many products are oleic-acid-rich extracts, so check the actual OEA content.

Is OEA safe?

Short-term oleoylethanolamide trials reported no serious adverse events, but there are no long-term safety data and no studies in pregnancy, breastfeeding or children. If you take lipid-lowering or diabetes medication, discuss OEA with a doctor.

Scientific references

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