Extra virgin olive oil can modestly lower blood pressure, particularly systolic pressure, when consumed regularly. A UC Davis Olive Center analysis of seven key studies found that at least two tablespoons (25 ml) per day of extra virgin olive oil could significantly decrease systolic blood pressure in as little as three weeks. The effect is real but moderate, typically in the range of 2 to 3 mmHg, which makes olive oil a useful dietary tool rather than a standalone treatment.
How Olive Oil Lowers Blood Pressure
The blood pressure benefits come primarily from plant compounds called polyphenols, which are concentrated in extra virgin olive oil. These polyphenols work through several pathways at once. They boost your body’s production of nitric oxide, a molecule that relaxes and widens blood vessels, while simultaneously reducing the destructive molecules that break nitric oxide down. The net effect is that your arteries stay more relaxed and flexible, allowing blood to flow with less resistance.
Olive oil polyphenols also inhibit angiotensin-converting enzyme (ACE), the same target that a common class of blood pressure medications works on. By blocking this enzyme, olive oil helps prevent the narrowing of blood vessels that drives pressure up. One compound in particular, oleuropein, has been widely studied for its antihypertensive activity. It slows heart rate slightly, reduces the force of each heartbeat, and may even affect how the kidneys reabsorb water, all of which contribute to lower pressure readings.
How Much You Need to Consume
The clinical studies that showed meaningful blood pressure reductions used between two and four tablespoons of extra virgin olive oil daily. In one trial, participants consuming about 50 ml per day (roughly 3.5 tablespoons) for just three weeks saw a 2.5 mmHg drop in systolic blood pressure. That may sound small, but at a population level, even a 2 mmHg reduction in systolic pressure is associated with meaningful decreases in heart attack and stroke risk.
The American Heart Association considers olive oil the staple fat of the Mediterranean diet, which it recommends for cardiovascular disease prevention. A 2020 study cited by the AHA found that consuming more than half a tablespoon of olive oil a day was associated with lower heart disease risk. For blood pressure specifically, though, the evidence points to a higher threshold: at least two tablespoons daily to see measurable changes.
That’s a significant amount of calories, roughly 240 calories for two tablespoons. The most effective approach is to use olive oil as a replacement for other fats you’re already eating (butter, margarine, vegetable oil) rather than adding it on top of your current diet.
Extra Virgin vs. Refined: The Grade Matters
Not all olive oil is equal when it comes to blood pressure. Extra virgin olive oil is extracted mechanically under conditions that preserve its polyphenol content. Refined olive oil, including bottles labeled simply “olive oil” or “light olive oil,” undergoes chemical and physical processing that strips away most of these protective compounds. A refined oil might contain as little as 3 mg/kg of polyphenols compared to 360 mg/kg or more in a high-quality extra virgin oil.
In one controlled trial comparing high-polyphenol extra virgin olive oil (360 mg/kg polyphenols) to low-polyphenol olive oil (86 mg/kg), the high-polyphenol version produced a significant 2.5 mmHg drop in systolic blood pressure while the lower-polyphenol oil did not reach the same threshold. The UC Davis analysis concluded that the oil needs a total phenol content of at least 161 mg/kg to produce reliable blood pressure effects. If you’re choosing olive oil specifically for cardiovascular benefits, look for extra virgin from a reputable producer, ideally one that lists a harvest date on the bottle, since polyphenol content declines with age and exposure to light.
Does Cooking Reduce the Benefits?
Heating olive oil does degrade some of its polyphenols, but not as dramatically as many people assume. Short-duration cooking below 180°C (356°F), which covers most sautéing and oven roasting, results in roughly 20 to 30 percent polyphenol loss. That still leaves the majority of beneficial compounds intact. Prolonged heating at high temperatures, like extended deep frying, causes more substantial degradation.
For maximum blood pressure benefit, using extra virgin olive oil raw, as a salad dressing or drizzled over finished dishes, preserves the most polyphenols. But cooking with it is still worthwhile. A pan-sautéed vegetable dish made with extra virgin olive oil retains far more of these compounds than the same dish made with refined olive oil or a different cooking fat.
What Olive Oil Can and Cannot Do
Olive oil is not a replacement for blood pressure medication. The reductions seen in clinical trials, typically 2 to 3 mmHg systolic, are modest compared to what medications achieve. If your blood pressure is significantly elevated, dietary changes alone are unlikely to bring it into a healthy range.
Where olive oil excels is as part of a broader dietary strategy. The Mediterranean diet pattern, which uses olive oil as its primary fat source alongside vegetables, whole grains, fish, and legumes, consistently produces larger blood pressure reductions than any single food can deliver. Olive oil also lowers LDL cholesterol, reduces inflammation, and provides antioxidant protection, benefits that compound over time to lower overall cardiovascular risk even beyond its direct effect on blood pressure.
For someone with mildly elevated blood pressure or a family history of hypertension, swapping two to three tablespoons of other cooking fats for extra virgin olive oil each day is one of the more evidence-backed dietary changes available. Effects can begin within three weeks, and the benefits appear to persist with continued use.