What is the recommended dosage for Olive Leaf Extract?

General: 500-1,000 mg standardized extract/day (15-20% oleuropein)

What are the side effects of Olive Leaf Extract?

Potential side effects include: Mild gastrointestinal discomfort, Headache (possible Herxheimer reaction), Dizziness.

What is olive leaf extract and how does it relate to immune function?

Olive leaf extract contains oleuropein and hydroxytyrosol, polyphenolic compounds with antioxidant and antimicrobial properties. Preliminary research suggests it may support immune defenses against pathogens and help modulate inflammatory responses.

What dosage of olive leaf extract has been studied?

Clinical studies have used olive leaf extract at doses of 500–1,000 mg per day, standardized to contain 15–25% oleuropein. Study durations range from 4 to 12 weeks, though human clinical data for immune outcomes remains limited.

What are the potential side effects of olive leaf extract?

Olive leaf extract is generally well tolerated. Mild side effects may include headache, dizziness, and gastrointestinal discomfort. It may interact with blood pressure and diabetes medications by enhancing their effects.

Olive Leaf Extract

herb

Also known as: Olea europaea, Oleuropein

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About

Olive leaf extract contains oleuropein and hydroxytyrosol, compounds with potent antioxidant activity that modulate immune cell function, support NF-kB regulation and interferon production, and display antimicrobial properties against bacteria, viruses, and fungi.

How It Works

Oleuropein and hydroxytyrosol exhibit potent antioxidant activity and modulate immune cell function; support NF-kB regulation and interferon production; display antimicrobial properties against bacteria, viruses, and fungi.

Evidence For Conditions

Condition	Grade	Studies	Participants
Upper Respiratory Tract Infections	D	3	100	View →

Side Effects

Mild gastrointestinal discomfort
Headache (possible Herxheimer reaction)
Dizziness

Drug & Supplement Interactions

Antihypertensive medications (additive blood pressure lowering)
Diabetes medications (may lower blood sugar)
Anticoagulants (theoretical increased bleeding risk)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Andrographis Astragalus Echinacea Elderberry Garlic

Quick Facts

Dosage: General: 500-1,000 mg standardized extract/day (15-20% oleuropein)
Forms: capsule liquid extract tea
Natural Sources: Olive tree leaves
Upper Limit: No established UL
Best Time: With meals

Evidence Summary

Upper Respiratory Tract Infections D

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.