Olive Oil and Blood Pressure: What the Research Shows
The link between olive oil and blood pressure is one of the more genuinely interesting areas of nutrition research, and also one where it is easy to overstate things. Olive oil has been studied in the context of blood pressure for years, and the published evidence — epidemiological, clinical, and mechanistic — points in a consistent direction: diets rich in extra virgin olive oil, particularly higher-polyphenol oil, are associated with better cardiovascular markers, and some studies have looked specifically at blood pressure. But "associated with" is not the same as "treats", and olive oil is a food, not a medicine. This article explains what the research actually investigates, why polyphenols are central to the story, and how to read the evidence honestly without expecting an oil to do a doctor's job.
For our own oil, see our cold-pressed organic Marrakech olive oil.
The Short Answer
- Olive oil has been studied in the context of blood pressure, and both human and experimental research point towards a favourable association — but this is research about a food, not a treatment claim.
- The effect appears stronger for high-polyphenol extra virgin olive oil, pointing to the antioxidants rather than the fat alone.
- The proposed mechanism involves polyphenols supporting the lining of the blood vessels and nitric oxide, which helps vessels relax.
- Most of the strongest evidence comes from olive oil as part of a Mediterranean dietary pattern, not from oil taken in isolation.
- Olive oil is a food, not a medicine. It is not a substitute for prescribed blood-pressure treatment, and you should never change medication based on a food.
- If blood pressure is a concern, the research supports a high-quality extra virgin oil as part of a balanced diet — alongside, not instead of, medical advice.
What the Research Has Investigated
Olive oil and blood pressure is not a new question; it has a substantial body of published work behind it. Reviews bringing together epidemiological, clinical, and mechanistic studies report that both experimental and human research tend to show favourable effects of olive oil on blood pressure, with the antioxidant polyphenols singled out as a likely driver. Population studies have repeatedly linked higher olive oil intake, within a broadly Mediterranean way of eating, to better cardiovascular profiles.
The honest framing matters here. This is research describing associations and mechanisms in studied populations and conditions — it is not a licence to treat high blood pressure with a spoon of oil. The value of the evidence is that it makes olive oil a well-supported part of a heart-healthy diet, not that it turns a food into a therapy.
Why Polyphenols Are Central
One of the most consistent threads in the research is that the polyphenols matter. The effect on blood-pressure markers appears stronger with high-polyphenol extra virgin olive oil than with refined oil stripped of those compounds, which points to the antioxidants rather than the monounsaturated fat alone. Extra virgin olive oil's polyphenols — oleocanthal, oleuropein, hydroxytyrosol, and tyrosol — are the same compounds the EU recognises in a registered health claim (Regulation 432/2012) for helping protect blood lipids from oxidative stress.
Mechanistically, the leading explanation is that these polyphenols support the function of the endothelium — the thin lining of the blood vessels — and the availability of nitric oxide, a signalling molecule that helps blood vessels relax and widen. Better endothelial function and vessel relaxation are plausibly linked to healthier blood-pressure regulation. It is a coherent, well-grounded mechanism — and, importantly, it depends on the oil actually containing those polyphenols, which a refined or aged oil largely will not.
The Mediterranean Diet Is the Bigger Picture
Most of the strongest evidence does not come from olive oil swallowed on its own, but from olive oil as the principal fat in a Mediterranean dietary pattern. The landmark trial here is PREDIMED (Estruch and colleagues, republished in the New England Journal of Medicine in 2018 after a re-analysis of the 2013 results). It randomised over 7,400 people at high cardiovascular risk to a Mediterranean diet supplemented with extra virgin olive oil, a Mediterranean diet supplemented with nuts, or a lower-fat control diet, and found roughly a 30% lower rate of major cardiovascular events in the Mediterranean-diet groups.
Two honest caveats are worth stating plainly. First, PREDIMED measured cardiovascular events — heart attacks, strokes, and cardiovascular death — as its main outcome, not blood pressure specifically. Second, the benefit was seen for the whole dietary pattern, with olive oil as a central component, not for olive oil taken in isolation. The takeaway is not "oil lowers blood pressure" but "a way of eating built around good olive oil is well supported for heart health".
How to Read This Sensibly
Put together, the research makes a reasonable case: a high-polyphenol extra virgin olive oil, used as the main fat in a plant-rich, balanced diet, is a sensible choice for anyone thinking about cardiovascular health. Using olive oil in place of butter, refined oils, and other less helpful fats — rather than in addition to everything else — is where the benefit sits, and the quality of the oil matters because the polyphenols do.
What the evidence does not support is treating olive oil as a blood-pressure remedy. If you have high blood pressure, it is a medical matter: it should be monitored and managed with your doctor, and you should never stop or change prescribed medication on the strength of a food. Olive oil can be part of a healthy diet that supports your overall wellbeing — but it works alongside proper medical care, not instead of it.
Why Sidr & Stone
Because the research keeps pointing back to polyphenols, the quality and freshness of the oil is the part that actually matters — and that is precisely where we focus. We are not going to tell you our oil lowers blood pressure; what we will tell you is what is in the bottle and why it is well-placed to deliver the polyphenols the research is interested in.
- Single-estate — one family-owned grove on the plains outside Marrakech, Morocco, with no blending across origins.
- Rain-fed — no irrigation; the trees take what the season gives them.
- Organically grown — no synthetic fertilisers, pesticides, or herbicides.
- Single harvest — a small, limited batch, harvested only when the season says the fruit is ready, sometimes weeks later than neighbouring farms.
- Cold-pressed within hours of harvest — flavour, aroma, and polyphenols preserved by pressing while the fruit is fresh.
- Unfiltered extra virgin — minimally processed, never refined, and it may show a little natural sediment, which is normal for a genuine unrefined oil.
- 100% natural — a single ingredient, olive oil, with nothing added.
- Dark glass with a gold label — protective packaging that shields the oil from the light that degrades polyphenols.
- Halal certified, with 10% of profits going to charity, and fulfilment in the UK, EU, and US.
We will not tell you Sidr & Stone is the best olive oil — that would be the kind of unverifiable claim we avoid. What we will say is that our oil is single-estate Moroccan, rain-fed, organically grown, and cold-pressed within hours of harvest as an unrefined extra virgin oil — the conditions under which an oil keeps the polyphenols the research is built around.
Frequently Asked Questions
Does olive oil lower blood pressure?
Research has investigated olive oil in the context of blood pressure and reports favourable associations, especially for high-polyphenol extra virgin oil as part of a Mediterranean diet. But this is research about a food, not a treatment, and olive oil should not be used in place of prescribed blood-pressure care.
Is high-polyphenol olive oil better for this?
The research suggests the effect on blood-pressure markers is stronger with high-polyphenol extra virgin olive oil than with refined oil, pointing to the antioxidants rather than the fat alone. Fresh, unrefined oil retains far more of those polyphenols.
How does olive oil affect blood vessels?
The leading explanation is that olive oil polyphenols support the endothelium — the lining of the blood vessels — and nitric oxide, which helps vessels relax and widen. This is a plausible mechanism studied in research, not a guaranteed outcome for any individual.
What was the PREDIMED study?
PREDIMED was a large trial (republished in the New England Journal of Medicine in 2018) that found a Mediterranean diet supplemented with extra virgin olive oil or nuts reduced major cardiovascular events by roughly 30% versus a lower-fat diet. It measured cardiovascular events overall, not blood pressure specifically.
Can olive oil replace my blood-pressure medication?
No. Olive oil is a food, not a medicine. High blood pressure is a medical condition that should be managed with your doctor, and you should never stop or change prescribed medication based on a food.
How should I use olive oil for heart health?
The research supports using extra virgin olive oil as the main fat in a plant-rich, balanced diet — in place of butter and refined oils, not in addition to them — alongside, not instead of, medical advice.
Can I buy Sidr & Stone olive oil now?
Our single-estate Marrakech extra virgin olive oil is available to pre-order ahead of its first harvest, with fulfilment in the UK, EU, and US. It is a small, limited first pressing, and you can reserve yours from the product page.
Is olive oil a medicine?
No. Olive oil is a food, not a medicine. It has a long traditional history — including being honoured in the Prophetic Sunnah — and a substantial body of modern research, particularly around polyphenols, cardiovascular health, and the Mediterranean diet pattern. It can be a worthwhile part of a healthy routine, but it does not cure diseases and is not a substitute for medical care. Be cautious of any olive oil marketed with specific disease-cure claims.
Final Thoughts
The honest summary on olive oil and blood pressure is that the research is genuinely encouraging and genuinely limited at the same time. Encouraging, because a real body of epidemiological, clinical, and mechanistic work links high-polyphenol extra virgin olive oil, within a Mediterranean diet, to better cardiovascular markers. Limited, because that is an association about a dietary pattern, not proof that an oil treats high blood pressure — and a food is never a replacement for medical care.
The practical conclusion is simple and unglamorous: if you want olive oil to do the job the research describes, choose a fresh, high-polyphenol extra virgin oil, make it the main fat in a balanced diet, and keep your blood pressure in the hands of your doctor. The oil supports a healthy way of eating; it does not stand in for treatment.
Our cold-pressed organic Marrakech olive oil — single-estate, rain-fed, organically grown, and unfiltered extra virgin — is available to pre-order now, with fulfilment in the UK, EU, and US.
Pre-Order Sidr & Stone Organic Marrakech Olive Oil — Limited First Harvest →
Disclaimer: This article describes published research on olive oil and blood pressure at the time of writing; research findings may change, and readers should check current sources. Olive oil is a food, not a medicine, and is not a substitute for medical treatment of any condition. High blood pressure is a medical matter — do not stop or change any prescribed medication, and consult a qualified medical professional for any health concern.
