Oleuropein is a phenolic compound and major polyphenol found in olive leaves and unripe olives. It is commonly provided in standardized olive leaf extract supplements.

What are the potential benefits of oleuropein?

Oleuropein is studied for antioxidant activity, cardiovascular support, and anti-inflammatory effects. Research focuses on oxidative stress, vascular function, and inflammatory signaling.

How much oleuropein is typically taken?

Common supplemental amounts are about 50–100 mg of oleuropein per day, depending on the product’s standardization. Follow the label and consider medical advice if you have health conditions.

Is oleuropein safe to take?

Oleuropein is generally used in supplements as part of olive leaf extract, but tolerance can vary. People who are pregnant, breastfeeding, or taking medications should consult a clinician before use.

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Oleuropein

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Oleuropein is the main polyphenol in olive leaf, studied for antioxidant, cardiovascular, and anti-inflammatory effects.

Anti-inflammatory Cardiovascular Support Antioxidant Immune Booster

dose range

50–100 mg

Once daily, with a meal

Consumption

Take with food to optimize absorption and reduce GI side effects; usually provided as part of a standardized olive leaf extract.

Not fat-soluble.

Best time

Morning or any time of day; take at the same time daily for consistency.

Description

Oleuropein is a phenolic compound predominantly found in olive leaves and unripe olives. It is widely available as a supplement, standardized within olive leaf extracts, and has been researched for various health benefits, particularly cardiovascular and antioxidant support.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Most benefits are supported by animal studies and a limited number of clinical trials. Human data is still emerging, and long-term safety and efficacy require further research.

Antioxidant activity

Moderate

Oleuropein possesses strong antioxidant properties, helping to reduce oxidative stress and protect cells from damage.

Particularly relevant for: General wellness · Aging adults

1 · PubMed: Oleuropein as antioxidant and anti-inflammatory 6 · EFSA: Scientific opinion on olive polyphenols

Cardiovascular support

Moderate

Clinical trials suggest oleuropein may lower systolic blood pressure and improve vascular health, supporting overall heart function.

Particularly relevant for: Adults with mild hypertension · Heart health support

2 · PubMed: Clinical trial of oleuropein in hypertension 5 · NIH ODS: Olive Oil and Heart Health

Anti-inflammatory effects

Limited

Oleuropein demonstrates anti-inflammatory action, suppressing pro-inflammatory cytokines and potentially aiding inflammatory conditions.

Particularly relevant for: Individuals with inflammatory conditions

3 · NCBI: Anti-inflammatory activity of oleuropein

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Generally well tolerated at standard doses, but high doses or use in specific populations may pose risks.

warning notices

May cause mild gastrointestinal upset or headache in sensitive individuals.
Insufficient research on use in pregnancy, breastfeeding, or young children.
Avoid use during pregnancy and breastfeeding due to insufficient safety data.
Use with caution or avoid if you have low blood pressure or are taking antihypertensive medications without medical supervision.
Monitor for potential allergic reactions or gastrointestinal upset.

Known interactions with medications

Antihypertensive agents (additive blood pressure lowering)

Contraindications / special precautions

Pregnancy
Breastfeeding
Low blood pressure (hypotension)

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Potential interactions mainly relate to blood pressure modulation and possible additive effects when combined with antihypertensive drugs.

May potentiate the effects of blood pressure-lowering drugs

drug · Antihypertensive medications

CautionModerate

Why

Oleuropein can lower blood pressure, which may enhance or potentiate antihypertensive medications and increase risk of hypotension.

recommendation

Monitor blood pressure closely if used together and consult a healthcare professional.

2 · PubMed: Clinical trial of oleuropein in hypertension 4 · WebMD: Olive leaf

mechanisms of action

Brief explanations of how it works

Free radical scavenging and antioxidant support

Oleuropein directly scavenges reactive oxygen species, reducing oxidative stress and cell damage.

1 · PubMed: Oleuropein as antioxidant and anti-inflammatory

Reduction of pro-inflammatory cytokines

Oleuropein inhibits pathways involved in inflammation, such as NF-κB, leading to decreased production of pro-inflammatory molecules.

3 · NCBI: Anti-inflammatory activity of oleuropein

Modulation of vascular function

Oleuropein promotes vasodilation and may inhibit cholesterol oxidation, contributing to cardiovascular health.

2 · PubMed: Clinical trial of oleuropein in hypertension 5 · NIH ODS: Olive Oil and Heart Health

Sources & References

Primary literature and reviews on which these statements are based

6 sources

PubMed: Oleuropein as antioxidant and anti-inflammatory

PubMed: Clinical trial of oleuropein in hypertension

NCBI: Anti-inflammatory activity of oleuropein

WebMD: Olive leaf

NIH ODS: Olive Oil and Heart Health

EFSA: Scientific opinion on olive polyphenols

Laatst bijgewerkt: 7 februari 2026

This information is for educational purposes only and does not replace medical advice.