Olive

botanical(E)-2-pentenal

What is it

Olive (Olea europaea) is a small evergreen tree native to the Mediterranean basin whose fruit and leaves have been used for thousands of years as food, oil, and medicine. In supplement form, olive leaf extract and concentrated olive polyphenol preparations are used for cardiovascular and immune support. Olive oil itself is a foundational component of the Mediterranean diet.

How it works

Olive leaves and fruits contain a complex mix of polyphenols, with oleuropein being the most distinctive and studied compound. Oleuropein and its breakdown product hydroxytyrosol have potent antioxidant activity, with the EFSA approving health claims for olive oil polyphenols based on protection of blood lipids from oxidative damage. Proposed mechanisms for cardiovascular benefits include antioxidant protection of LDL cholesterol from oxidation (relevant to atherosclerosis development), modest blood pressure-lowering effects, improvements in endothelial function, and anti-inflammatory activity. Olive leaf extract has been studied for these effects and also for antimicrobial properties against various bacteria and viruses in laboratory studies. Olive oil contains primarily monounsaturated fat (oleic acid) along with smaller amounts of polyphenols and other minor components. Extra virgin olive oil retains the highest polyphenol content. The combination of healthy fat profile and polyphenol content underlies much of the Mediterranean diet's documented cardiovascular benefits.

Evidence for 6 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Cardiovascular health (Mediterranean diet pattern)

Grade A

Strong evidence

Mediterranean dietary patterns rich in extra virgin olive oil are associated with reduced cardiovascular events in large prospective studies and the PREDIMED trial. EFSA has approved a health claim for olive oil polyphenols' protection of blood lipids from oxidative damage.

Mild hypertension

Grade B

Good evidence

Multiple trials of olive leaf extract show modest blood pressure reductions in people with prehypertension or mild hypertension. Effects are smaller than prescription antihypertensives but clinically meaningful.

LDL cholesterol oxidation

Grade B

Good evidence

Olive oil polyphenols (particularly hydroxytyrosol) protect LDL particles from oxidative damage, a key step in atherosclerosis development. This is the basis for EFSA's approved health claim.

Inflammatory markers

Grade B

Good evidence

Olive oil polyphenols modestly reduce inflammatory markers, contributing to broader cardiometabolic benefits.

Antimicrobial and immune support

Grade C

Moderate evidence

Olive leaf extract has antimicrobial activity in laboratory studies. Clinical translation to specific infectious conditions is limited.

Type 2 diabetes (modest glucose improvement)

Grade C

Moderate evidence

Some trials suggest olive leaf extract may modestly improve glucose tolerance and HbA1c in people with type 2 diabetes.

5 commercial forms

Olive leaf extract (standardized to oleuropein)

Typically 12-20% oleuropein

Most common supplement form. Used for cardiovascular and immune applications.

Extra virgin olive oil

Highest polyphenol content of olive oils

Dietary form. The cornerstone of the Mediterranean diet.

Concentrated olive polyphenols

Standardized hydroxytyrosol or oleuropein

Supplement form delivering concentrated polyphenols without oil.

Olive fruit extract

From olive flesh and pit

Less common than leaf extract; contains different polyphenol profile.

Whole olives (table olives)

Whole-food form, sodium content varies

Mediterranean dietary staple. Choose varieties low in sodium when possible.

Dosage

There is no established RDA. For olive leaf extract, common doses are 500 to 1,000 mg per day, often standardized to oleuropein content (typically 12 to 20 percent). For dietary olive polyphenols, the EFSA-approved health claim requires at least 5 mg of hydroxytyrosol and its derivatives per 20 grams of olive oil, providing at least 20 mg daily. Mediterranean dietary patterns include 20 to 40 mL of extra virgin olive oil daily.

When and how to take it

Olive leaf extract can be taken with or without food. Doses are typically divided two or three times daily. Effects on blood pressure and cardiovascular markers emerge over weeks. Olive oil as part of meals (Mediterranean dietary pattern) provides consistent intake of healthy fats and polyphenols without specific timing concerns.

Food sources

Food	Amount	%DV
Extra virgin olive oil	1 tablespoon (~14g)	—
Whole olives (green or black)	10 olives (~30-40g)	—
Olive paste/tapenade	1 tablespoon	—

Safety

Olive leaf extract and olive products are generally well tolerated. Side effects are uncommon at typical doses. Olive leaf extract may cause mild stomach upset, headache, dizziness, or slight blood pressure reduction (potentially desirable for hypertensives but warranting monitoring). Olive pollen can trigger allergic reactions in sensitive individuals, though this is mostly relevant to fresh plant exposure. There is no established Tolerable Upper Intake Level.

Who should be cautious

Pregnant and breastfeeding women can generally use olive oil as food; high-dose olive leaf extract should be discussed with a clinician. People with low blood pressure should monitor when starting olive leaf extract. People with diabetes should monitor glucose. People allergic to olive pollen should be cautious with topical or fresh-plant preparations. Discontinue concentrated extracts before scheduled surgery.

Interactions

Olive leaf extract may potentiate antihypertensive medications, requiring blood pressure monitoring. May modestly enhance diabetes medication effects (mild glucose-lowering observed). Possible interactions with anticoagulants due to mild antiplatelet effects in some studies. Generally low interaction profile at dietary olive oil intake.

Frequently asked questions

Should I use olive oil or take olive leaf extract?⌄

Extra virgin olive oil as part of a Mediterranean dietary pattern has the strongest cardiovascular evidence. Olive leaf extract is more concentrated in oleuropein and may have specific effects on blood pressure. They serve different purposes.

How much olive oil should I eat daily?⌄

Mediterranean dietary studies show benefit with 20 to 40 mL (about 1.5 to 3 tablespoons) of extra virgin olive oil daily. The EFSA-approved health claim requires at least 20 mg of hydroxytyrosol-type polyphenols daily.

Does olive leaf extract really lower blood pressure?⌄

Multiple trials show modest blood pressure reductions in prehypertension and mild hypertension. Effects are smaller than prescription medications but clinically meaningful for some users.

What's special about extra virgin olive oil?⌄

Extra virgin olive oil is cold-pressed and minimally processed, preserving the highest polyphenol content. Refined olive oils lose most polyphenols during processing, reducing the antioxidant benefits.

Are olives healthy too?⌄

Yes. Whole olives provide many of the same polyphenols as the oil, plus fiber. Sodium content from curing can be high, so moderate intake and choose lower-sodium varieties when possible.

References

Wikidata: Olea europaea — Wikidata link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.