What is olive leaf extract?

Olive leaf extract is a supplement made from Olea europaea leaves. It contains polyphenols such as oleuropein and hydroxytyrosol.

What are the main benefits of olive leaf extract?

It is commonly used for cardiovascular support, immune support, and antioxidant effects. Some people use it to support healthy blood pressure and overall cardiometabolic health.

What is a typical dosage for olive leaf extract?

Common supplemental amounts are about 500–1000 mg per day, depending on the product and its standardization. Follow the label directions and consider medical advice if you have health conditions.

Does olive leaf extract help with infections?

Oleuropein and related compounds show antimicrobial activity in laboratory studies. Human evidence is more limited, so it should not replace medical treatment for infections.

Who should be cautious with olive leaf extract?

People using blood pressure or blood sugar medications should use caution due to potential additive effects. Pregnant or breastfeeding individuals and those with medical conditions should consult a clinician before use.

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Olive Leaf
Extract

Moderate study situation·7/10

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

Olive leaf extract, rich in oleuropein, is used for cardiovascular support, immune health, and antioxidant benefits.

Anti-inflammatory Cardiovascular Support Antioxidant Immune Booster

dose range

500–1000 mg

1–2 divided doses with meals

Consumption

Take with food to enhance absorption and gastrointestinal tolerability. Use standardized extracts (e.g., ~20% oleuropein).

Not fat-soluble.

Best time

Divided between first and second meal appears typical and may aid absorption.

Description

Derived from the leaves of the olive tree (Olea europaea), olive leaf extract contains compounds like oleuropein and hydroxytyrosol, which are credited with its health-promoting properties. It is commonly used as a dietary supplement in the Mediterranean region and beyond, primarily for cardiovascular, immune, and antioxidant support.

benefits

Main effects with level of evidence

Moderate

Note on evidence

There is moderate evidence from randomized controlled trials and preclinical studies for cardiovascular and antioxidant benefits, and emerging evidence for antimicrobial effects.

Cardiovascular Support

Moderate

Olive leaf extract may help lower blood pressure and improve certain cardiovascular risk factors, particularly in people with borderline or mild hypertension.

Particularly relevant for: Adults with elevated blood pressure · Individuals seeking cardiovascular health

S1 · PubMed (Perrinjaquet-Moccetti et al., 2008)S6 · Examine.com Olive Leaf Extract

Antimicrobial and Immune Support

Limited

Oleuropein and related compounds show antimicrobial and antiviral activity in vitro, suggesting a potential role in supporting immune defenses.

Particularly relevant for: Individuals seeking immune support

S2 · PubMed (Gbenou et al., 2017)

Antioxidant and Anti-inflammatory Effects

Moderate

Olive leaf extract acts as an antioxidant and may modestly reduce markers of inflammation and oxidative stress in humans and animal models.

Particularly relevant for: General wellness · People with high oxidative stress

S3 · PubMed (Al-Azzawie & Alhamdani, 2006)S6 · Examine.com Olive Leaf Extract

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Generally well-tolerated in recommended doses, but caution advised during pregnancy, breastfeeding, and with blood pressure-lowering drugs.

warning notices

Mild gastrointestinal symptoms (nausea, diarrhea) or headache may occur, especially at higher doses.
Potential additive effects with antihypertensives; blood pressure monitoring is advised if combined.
Lack of adequate safety data for use in pregnancy and breastfeeding.
Avoid during pregnancy and breastfeeding due to insufficient safety data.
Use cautiously if taking antihypertensive medications, as additive blood pressure lowering may occur.
Avoid use if allergic to olive or related plants.

Known interactions with medications

Antihypertensive medications (additive effect)

Contraindications / special precautions

Pregnancy
Breastfeeding
Allergy to olive/related plants

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Olive leaf extract can potentiate the effects of blood pressure medications and may theoretically interact with other supplements affecting cardiovascular or metabolic pathways.

Olive leaf extract may enhance the effects of blood pressure medications.

drug · antihypertensive medications

CautionModerate

Why

Oleuropein can lower blood pressure through vasodilation and ACE inhibition, potentially leading to additive hypotensive effects when combined with antihypertensive drugs.

recommendation

Monitor blood pressure and consult a healthcare provider before combining with antihypertensive medications.

S1 · PubMed (Perrinjaquet-Moccetti et al., 2008)S4 · WebMD S6 · Examine.com Olive Leaf Extract

mechanisms of action

Brief explanations of how it works