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Olive

Olive

Best for

Lower blood pressure

Large effect, needs confirmation 51.1 mg/day 12 weeks 1 study, n=90

  • 3 papers
  • 2 of 20 outcomes
  • 2 positive

Olive leaf extract produces a large blood-pressure effect, but the finding needs confirmation; evidence remains too thin for dependable cholesterol benefits.

Median effective dose, most-studied outcomes

Full protocol, 4 outcomes

Risk, worst reported severity

  • acne flare

What olive actually does

Outcome Effect Evidence Dose Time Rank
Worth watching 1
Lower blood pressure Large effect, needs confirmation Blood pressure is the force of blood against artery walls, and high levels strain the heart.
large 		1 RCT 1 papers · n=90 51.1 mg 12 wk —
Early research 1
Lower cholesterol Barely detectable High LDL cholesterol can build up in artery walls and raise the risk of heart disease.
trivial 		1 RCT 1 papers · n=90 51.1 mg 12 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

The available 12-week protocol centers on 51.1 mg daily of an olive-derived phenolic component, with blood pressure as the most interesting outcome. 1 Treat that as a research reference point, not a confirmed target dose, because the evidence comes from early work and cholesterol outcomes did not show meaningful improvement. 1

When and how long

Take olive leaf extract consistently every day during a planned trial period rather than using it occasionally. The key study assessed outcomes after 12 weeks, so it offers no evidence that a single dose produces a useful blood pressure effect. 1 If you use it, follow the product label for whether to take it with food, since the trial evidence does not establish a best time of day. 1

Forms & standardisation

Look for an olive leaf extract that names its phenolic content, particularly oleuropein, rather than a label that simply says "olive." The studied product was a phenolic-rich leaf extract, so olive oil and unstandardized olive powders do not match the tested form. 1

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Lower LDL cholesterol 51.1 mg — 12 wk 1 paper
Lower your systolic pressure 51.1 mg — 12 wk 1 paper
Lower total cholesterol 51.1 mg — 12 wk 1 paper
Lower your diastolic pressure 51.1 mg — 12 wk 1 paper

Adverse events and drug interactions

Safety events

acne flare
In context

What this is and how it works

  • One randomized study (k=1; n=90) lowered both blood-pressure numbers; numerical change and MCID comparison were unavailable. 1
  • Three papers reviewed here span 20 outcomes, with blood pressure strongest and cholesterol evidence limited.
  • Early research means large blood-pressure effects require confirmation before replacing established care.

Olive supplements usually use an extract from olive leaves rather than the oil you drizzle on food. The extract concentrates plant compounds called polyphenols, especially oleuropein, which gives olive leaves their sharp, bitter taste. 1

Olive leaf polyphenols appear to influence the enzyme signals that tell blood vessel walls when to tighten or loosen, like adjusting the pinch on a garden hose. That mechanism fits the blood pressure changes seen in a 12-week trial, although the trial was too limited to settle how dependable the effect is. 1

Bottom line

Olive leaf extract is worth watching if you want to explore an early, food-derived option for blood pressure support and already have the fundamentals in place. The signal is interesting, but the evidence is too thin to lean on for cholesterol support or to expect predictable results. 1 If it triggers an acne flare or any unwanted reaction, stop using it and speak with a clinician.

Frequently asked

Common questions

Does olive leaf extract lower blood pressure?

One 12-week randomized trial found an eye-catching reduction in both systolic and diastolic blood pressure with a phenolic-rich olive leaf extract. That is promising, but one early result does not establish a reliable blood pressure strategy. 1

Does olive leaf extract lower cholesterol?

In the available 12-week trial, olive leaf extract showed no meaningful change in LDL or total cholesterol. Do not choose it primarily for cholesterol support. 1

Is olive oil the same as olive leaf extract?

No. The clinical trial used a phenolic-rich olive leaf extract standardized around olive compounds such as oleuropein, not culinary olive oil. 1

Sources

Sources

  1. 1. Impact of phenolic-rich olive leaf extract on blood pressure, plasma lipids and inflammatory markers: a randomised controlled trial (2017) ↑

Generated August 27, 2026

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