Home Ingredients Hydroxytyrosol
AntioxidantCardiovascularLongevity

Hydroxytyrosol

Evidence Level
Strong
3 Clinical Trials
5 Documented Benefits
4/5 Evidence Score

Hydroxytyrosol is the principal phenolic compound found in olives and extra-virgin olive oil and is widely regarded as one of the most potent natural antioxidants. It is generated during the hydrolysis of oleuropein, the bitter glycoside present in olive fruit and leaves. The European Food Safety Authority has authorized a health claim for olive oil polyphenols at a daily intake of at least 5 mg, recognizing their role in protecting blood lipids from oxidative stress. Hydroxytyrosol's small molecular size and amphiphilic nature allow it to cross cell membranes easily and exert direct antioxidant effects in both aqueous and lipid environments. Supplements typically deliver concentrated extracts from olive fruit or olive leaf that provide standardized amounts of hydroxytyrosol and other related polyphenols.

Studied Dose At least 5 mg/day olive polyphenols (EFSA); supplements typically 5-25 mg/day hydroxytyrosol.
Active Compound Hydroxytyrosol (3,4-dihydroxyphenylethanol) and related olive polyphenols including oleuropein, tyrosol, and oleocanthal.

Benefits

Protects LDL from Oxidation

An intake of at least 5 mg of olive polyphenols per day contributes to the protection of blood lipids from oxidative stress, an EFSA-recognized benefit central to Mediterranean dietary patterns and cardiovascular wellness.

Supported by Trial 1, Trial 2

Supports Cardiovascular Wellness

Hydroxytyrosol-rich olive oil intake is associated with healthy endothelial function, supporting cardiovascular wellness as part of a Mediterranean-style diet rich in vegetables, fish, and unrefined oils.

Supported by Trial 2, Trial 1

Provides Potent Antioxidant Defense

Hydroxytyrosol scavenges a wide range of free radicals and supports endogenous antioxidant systems, offering daily defense against oxidative stress at the cellular level.

Supported by Trial 1, Trial 2

Supports Healthy Inflammation Response

Olive polyphenols modulate eicosanoid production and inflammatory signaling, helping support the body's healthy inflammatory balance after exercise, exposure to environmental stressors, or daily metabolic activity.

Supported by Trial 1, Trial 2

Promotes Mitochondrial and Longevity Pathways

Hydroxytyrosol activates pathways involved in mitochondrial biogenesis and cellular stress resistance, both of which are associated with healthy aging and metabolic resilience.

Supported by Trial 1, Trial 3

Mechanism of action

1

Direct Free-Radical Scavenging

The ortho-diphenol structure of hydroxytyrosol allows it to donate electrons to a wide range of reactive oxygen and nitrogen species, neutralizing them efficiently in both aqueous and lipid compartments.

2

Nrf2 Pathway Activation

Hydroxytyrosol activates the Nrf2 transcription factor, upregulating endogenous antioxidant enzymes such as glutathione peroxidase, superoxide dismutase, and heme oxygenase-1.

3

Endothelial Nitric Oxide Support

Hydroxytyrosol supports endothelial nitric oxide synthase activity and bioavailability, contributing to healthy vascular tone and arterial flexibility.

4

LDL Particle Protection

By incorporating into LDL particles and quenching lipid peroxyl radicals, hydroxytyrosol helps protect circulating cholesterol from oxidative modification, an established cardiovascular risk factor.

Clinical trials

1
EUROLIVE: Olive Oil Polyphenols and Lipoproteins

Crossover randomized trial comparing low-, medium-, and high-polyphenol olive oils

200 healthy adult males across multiple European countries

Higher polyphenol content of olive oil was associated with linear improvements in HDL cholesterol, oxidized LDL, and other oxidative stress markers, providing the clinical foundation for the EFSA polyphenol health claim.

2
Olive Oil Phytochemicals Review

Comprehensive review of the biological activities of hydroxytyrosol and related olive polyphenols

Compilation of in vitro, animal, and human studies

Across multiple study types, olive polyphenols demonstrated robust antioxidant, vascular-supportive, and anti-inflammatory activities, supporting their role as key bioactives behind the cardiovascular benefits of the Mediterranean diet.

3
Olive Oil and Lipid Metabolism Review

Nutrition Reviews summary of olive oil consumption and lipid endpoints

Pooled clinical and observational evidence in adults

Regular olive oil consumption, particularly polyphenol-rich virgin oil, is associated with favorable lipid profile changes and reduced oxidative modification of LDL, consistent with mechanistic studies of hydroxytyrosol.

Side effects and drug interactions

Common Potential side effects

Generally very well tolerated at supplemental doses up to 50 mg/day.
Mild gastrointestinal discomfort possible in sensitive individuals.
Very rare allergic reactions in those allergic to olive products.
Bitter taste of concentrated extracts may be unpleasant for some users.
Headache reported occasionally at higher intakes.

Important Drug interactions

May modestly potentiate the effects of antihypertensive medications.
Could enhance the action of antiplatelet drugs at high doses.
Theoretical interaction with diabetes medications due to glucose-supportive effects.
Consult a clinician if using anticoagulants such as warfarin.

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Frequently asked questions about Hydroxytyrosol

What is hydroxytyrosol used for?

Hydroxytyrosol is a powerful polyphenol antioxidant from olives and olive oil, considered one of the key compounds behind the health benefits of the Mediterranean diet. It is studied for cardiovascular, antioxidant, and skin support.

What is hydroxytyrosol good for?

It is studied for protecting LDL cholesterol from oxidation (a recognized olive-polyphenol benefit), supporting healthy blood vessels and antioxidant status, and skin health. It is a concentrated way to get olive antioxidants.

How much hydroxytyrosol should I take?

Supplements often provide around 5 to 15 mg per day; extra-virgin olive oil is the classic dietary source, and EU health claims for olive polyphenols are based on a daily olive-oil polyphenol intake. Follow product labeling.

Is hydroxytyrosol safe?

It is very safe, reflecting its long dietary history in olive oil, and supplements are generally well tolerated. As with any concentrated antioxidant, those on medication should check with a doctor.

What is Hydroxytyrosol?

Hydroxytyrosol is the principal phenolic compound found in olives and extra-virgin olive oil and is widely regarded as one of the most potent natural antioxidants. It is generated during the hydrolysis of oleuropein, the bitter glycoside present in olive fruit and leaves.

What is the recommended dosage of Hydroxytyrosol?

The clinically studied dose is At least 5 mg/day olive polyphenols (EFSA); supplements typically 5-25 mg/day hydroxytyrosol. Always follow the product label and check with a healthcare provider for personal advice.

Is Hydroxytyrosol safe, and does it have side effects?

For most healthy adults, Hydroxytyrosol is well tolerated at studied doses. Reported effects can include: Generally very well tolerated at supplemental doses up to 50 mg/day. Mild gastrointestinal discomfort possible in sensitive individuals. It may also interact with some medications. Hydroxytyrosol is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Hydroxytyrosol interact with any medications?

Possible interactions include: May modestly potentiate the effects of antihypertensive medications. Could enhance the action of antiplatelet drugs at high doses. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Hydroxytyrosol?

NutraSmarts rates the evidence for Hydroxytyrosol as Strong (4 out of 5). It is backed by 3 clinical trials and 4 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(4 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Covas MI, Nyyssönen K, Poulsen HE, et al. The effect of polyphenols in olive oil on heart disease risk factors: a randomized trial. Annals of Internal Medicine. 2006;Ann Intern Med. 2006 Sep 5;145(5):333-41..PubMedUsed to support: EUROLIVE crossover trial in 200 healthy men showing that higher-polyphenol olive oil produced linear improvements in HDL cholesterol and oxidized LDL markers compared with lower-polyphenol olive oils.
  2. Visioli F, Galli C. Biological properties of olive oil phytochemicals. Critical Reviews in Food Science and Nutrition. 2002;Crit Rev Food Sci Nutr. 2002 May;42(3):209-21..PubMedUsed to support: Comprehensive review documenting antioxidant, vascular, and anti-inflammatory activities of hydroxytyrosol and other olive polyphenols across in vitro, animal, and human research.
  3. Tomé-Carneiro J, Visioli F. Olive oil consumption and its repercussions on lipid metabolism. Nutrition Reviews. 2020;Nutr Rev. 2020 Nov 1;78(11):952-968..PubMedUsed to support: Review summarizing clinical evidence that olive oil consumption, particularly virgin polyphenol-rich oils, supports favorable lipid metabolism and reduces LDL oxidative modification.
  4. Del Saz-Lara A, López de Las Hazas MC, Visioli F, Dávalos A. Nutri-Epigenetic Effects of Phenolic Compounds from Extra Virgin Olive Oil: A Systematic Review. Advances in Nutrition. 2022;Adv Nutr. 2022 Oct 2;13(5):2039-2060..PubMedUsed to support: Systematic review of nutri-epigenetic effects of EVOO phenolics including hydroxytyrosol, documenting modulation of gene expression pathways relevant to cardiovascular and metabolic wellness.