Citrus bergamot may modestly lower systolic blood pressure, but the evidence is still limited. In one randomized, double-blind, placebo-controlled trial, participants taking bergamot extract for four months saw their systolic pressure drop by about 8.6 mmHg, a 7% decrease. Diastolic pressure, however, barely budged. That’s a promising signal, not a proven treatment.
What the Clinical Evidence Shows
The strongest data on bergamot and blood pressure comes from a placebo-controlled trial published in the journal Foods. Participants in the bergamot group started with an average systolic reading of about 123 mmHg. After four months of daily supplementation, that dropped to roughly 114 mmHg. The reduction was statistically significant within the bergamot group itself, though when compared directly against the placebo group, the difference was borderline (just barely reaching statistical significance).
Diastolic pressure told a different story. It moved from about 79 mmHg to 78 mmHg over the same period, a change too small to be meaningful. So if your concern is specifically elevated diastolic pressure, bergamot doesn’t appear to help based on current data.
A separate 12-week trial in older adults with metabolic issues, including high blood pressure, didn’t find dramatic blood pressure results either. The researchers noted that the relatively low dose of bergamot in their formulation and the short study duration may have limited what they could detect. This hints that dose and time both matter, but we don’t yet have enough trials to pin down the ideal combination.
How Bergamot Affects Blood Vessels
Bergamot’s potential blood pressure effects trace back to its polyphenols, a class of plant compounds with strong antioxidant activity. These polyphenols appear to work primarily by boosting the body’s production and availability of nitric oxide, a molecule your blood vessels use to relax and widen. When vessels dilate, blood flows more freely and pressure drops.
The mechanism is indirect. Oxidative stress, the buildup of damaging molecules called free radicals, degrades nitric oxide before it can do its job. Bergamot polyphenols reduce that oxidative damage, effectively protecting nitric oxide so more of it stays active in your bloodstream. They also appear to lower levels of peroxynitrite, a harmful byproduct that forms when free radicals react with nitric oxide. Less peroxynitrite means healthier blood vessel linings and better dilation.
Animal research adds another layer: bergamot oil has been shown to relax smooth muscle in the walls of blood vessels, possibly by affecting how calcium and potassium flow in and out of cells. These are some of the same channels that prescription blood pressure medications target, though bergamot’s effect is far weaker.
Blood Pressure or Cholesterol: Which Is the Real Benefit?
Bergamot is better known as a cholesterol supplement than a blood pressure one. The International Lipid Expert Panel gave bergamot a Class IIa recommendation for lowering LDL cholesterol, noting reductions of roughly 15% to 40% in studies using doses between 500 and 1,500 mg per day. That’s a moderate endorsement, stronger than what exists for its blood pressure effects.
This distinction matters because high cholesterol and high blood pressure often travel together, and improving one can indirectly help the other. Healthier cholesterol levels reduce plaque buildup in arteries, which over time can improve how flexible those arteries are and lower pressure. It’s plausible that some of bergamot’s blood pressure benefit is a downstream effect of its lipid improvements rather than a direct, independent action on blood vessels. The existing trials haven’t been designed to tease apart these two pathways.
How It Compares to Proven Approaches
An 8.6 mmHg systolic drop sounds impressive, but context matters. The DASH diet (rich in fruits, vegetables, and low-fat dairy while cutting sodium) typically lowers systolic pressure by 8 to 14 mmHg. Regular aerobic exercise brings it down by about 5 to 8 mmHg. Losing even 10 pounds can reduce systolic pressure by roughly 5 mmHg. These lifestyle changes are backed by decades of large-scale research and form the foundation of every major cardiology guideline.
Bergamot’s single-trial result of 8.6 mmHg sits in a similar numerical range, but it comes from far less evidence. One trial with borderline significance against placebo is not the same as hundreds of studies confirming a benefit. If you’re looking for a supplement to layer on top of diet and exercise, bergamot is a reasonable candidate to discuss with your healthcare provider. As a replacement for proven strategies, it doesn’t have the track record.
Dosage and How Long It Takes
Most bergamot studies use daily doses between 500 and 1,500 mg of bergamot extract. The trial that found the 8.6 mmHg systolic reduction ran for four months, and the drop became apparent gradually over that period. A 12-week trial in older adults suggested that shorter durations or lower doses may not produce detectable blood pressure changes. If you’re considering bergamot, expect to take it consistently for at least three to four months before you’d know whether it’s making a difference for you.
Safety and Side Effects
Bergamot extract supplements are generally well tolerated at the doses used in research. The main safety concerns relate to bergamot oil (the concentrated essential oil), not the polyphenol extract typically sold as a supplement. Bergamot oil contains compounds called furocoumarins that cause severe photosensitivity, meaning your skin can burn or develop rashes more easily in sunlight. This is primarily a concern with topical application or very high oral intake of the oil itself.
There is a notable case report of a man who developed muscle cramps, twitching, tingling in his extremities, and blurred vision after drinking roughly a gallon of Earl Grey tea (flavored with bergamot oil) daily. A compound in bergamot called bergapten can alter potassium channel activity in muscles, which explains the cramping. At normal supplement doses, this is unlikely to be an issue, but it’s worth knowing that excessive intake carries real risks.
No well-documented drug interactions have been established for bergamot supplements. That said, because bergamot affects some of the same ion channels that blood pressure medications target (particularly calcium and potassium channels), combining it with prescription antihypertensives without monitoring could theoretically amplify effects. If you’re already on blood pressure medication, tracking your readings after starting bergamot is a sensible precaution.
Where Cardiology Guidelines Stand
No major cardiology organization currently recommends citrus bergamot specifically for blood pressure management. The American College of Cardiology and the American Heart Association don’t address nutraceuticals like bergamot in their prevention or cholesterol guidelines. European guidelines from the ESC and EAS acknowledge certain supplements (red yeast rice, omega-3s, phytosterols) for cholesterol management in select patients, but bergamot isn’t named in that group either.
The International Lipid Expert Panel has given bergamot its strongest endorsement for cholesterol reduction, not blood pressure. For anti-inflammatory effects, which could indirectly support cardiovascular health, the same panel assigned bergamot its lowest recommendation due to limited human data. In practical terms, bergamot is recognized as a promising nutraceutical for metabolic health broadly, but the specific claim that it lowers blood pressure still rests on thin evidence that needs replication in larger, longer trials.