Supplement analysis backed by scientific evidence · PT

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Limited evidenceLongevity & antioxidants

Olive Fruit Extract (Hydroxytyrosol)

Olive polyphenols demonstrably protect LDL from oxidation — the one claim with regulatory backing. Beyond that biomarker, evidence that isolated hydroxytyrosol supplements improve blood pressure, lipids or anything clinically meaningful is thin.

What the science says

  • Protects LDL from oxidative damage Moderate evidence

    The EUROLIVE randomised crossover trial in 200 men compared olive oils of low, medium and high phenolic content over three 3-week periods and found oxidised LDL fell linearly with phenolic content, alongside a small HDL increase. This underpins the EFSA-approved claim, which requires 5 mg/day of hydroxytyrosol and its derivatives. Note this was tested with olive oil as the matrix, not with isolated extract capsules.

  • Improves blood pressure and lipids Limited evidence

    A 2025 meta-analysis of randomised controlled trials of oleuropein, hydroxytyrosol and tyrosol found only small and largely inconsistent effects on cardiometabolic risk factors, with no reliable benefit for LDL cholesterol or blood pressure from isolated compounds. The trials are small, short and highly heterogeneous in preparation and dose.

  • Anti-inflammatory and antioxidant effects Limited evidence

    Hydroxytyrosol is a genuinely potent antioxidant in vitro and shifts some oxidative-stress biomarkers in humans. But biomarker movement has repeatedly failed to predict clinical benefit for antioxidant supplements, and no trial has shown hydroxytyrosol improving a hard clinical outcome.

  • Anti-diabetic effects Limited evidence

    Small trials of olive leaf extract (oleuropein-rich) report modest HbA1c and insulin sensitivity improvements, but sample sizes are under 100, results are inconsistent, and olive leaf extract is a different product from olive fruit hydroxytyrosol.

Dosage & safety

Studied doseThe EFSA claim threshold is 5 mg/day of hydroxytyrosol and derivatives — achievable from about 20 mL (roughly 1.5 tablespoons) of a genuinely high-phenolic extra virgin olive oil. Supplement trials used 5-50 mg/day of purified hydroxytyrosol, or 250-1,000 mg/day of olive fruit/leaf extract standardised to 10-40% hydroxytyrosol or oleuropein, over 2-12 weeks. Higher supplemental doses have no demonstrated added benefit, and the food matrix may matter. Refined olive oil and most supermarket 'light' olive oils contain negligible polyphenols.
SafetyWell tolerated at food-relevant intakes; olive oil polyphenols have a long dietary safety record. Isolated high-dose hydroxytyrosol supplements have limited long-term human safety data — most trials run under 12 weeks. Mild gastrointestinal upset is the main reported effect. Olive leaf preparations may lower blood pressure and blood glucose, so monitor when combined with antihypertensives or glucose-lowering drugs. Olive pollen allergy is common in Mediterranean regions, though fruit-extract reactions are rare. Insufficient data in pregnancy and breastfeeding. For most people, high-phenolic olive oil in the diet is a better-evidenced choice than a capsule.

Scientific references

Where to buy

ProHealth Longevity, Hydroxytyrosol Extreme™, 25 mg, 90 Capsules

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