Bergamot is the citrus fruit that gives Earl Grey tea its perfume. It grows almost exclusively along a short stretch of coast in Calabria, in southern Italy, and for most of its history the fruit was valued for the oil pressed from its peel. The juice and pulp were bitter byproducts.
Over the past decade or so, that discarded fraction has become a supplement. Extracts of bergamot juice are unusually rich in a group of flavonoids, and several small trials have reported that a standardized extract can shift blood lipids. It is now sold as “citrus bergamot” or “bergamot polyphenolic fraction” with marketing that ranges from cautious to breathless.
This brief looks at what the trials actually did, what they found, and where the evidence is still thin.
What Is in the Extract
Bergamot juice contains several flavonoids common to citrus, such as naringin, neohesperidin, and neoeriocitrin. What makes it distinctive is a pair of less common compounds, brutieridin and melitidin, which have a chemical structure that resembles part of the statin molecule. Laboratory work suggests they may inhibit the same enzyme in cholesterol synthesis that statins target, though far more weakly.
Commercial supplements are typically standardized to a percentage of total polyphenols, commonly in the 25-40 percent range, and are sold under a small number of branded ingredient names. The trials discussed here generally used one of those standardized fractions, which matters: a generic “bergamot powder” with no standardization may not resemble what was studied. Our guide to standardized extracts explains why that distinction is worth checking on the label.
What the Trials Found
The research base, as of early 2023, consists mostly of small controlled and open-label trials, many of them from Italian research groups with a connection to the region where the fruit is grown.
Lipids in people with elevated cholesterol. The most cited controlled trial randomized adults with high cholesterol to bergamot extract at either 500 mg or 1,000 mg per day, or placebo, for a month. Both extract groups saw reductions in total and LDL cholesterol and triglycerides, with a modest rise in HDL, and the effect appeared dose-dependent. Reported LDL reductions in this and similar trials have generally fallen somewhere between 10 and 30 percent, a wide range that reflects small sample sizes and differences in the populations studied.
Longer follow-up. A handful of trials ran for three to six months. They reported that the lipid changes persisted while the extract was taken, with no significant liver or muscle side effects, which is one of the reasons bergamot attracts people who could not tolerate statins.
Added to a statin. One small study gave bergamot to people already taking a low-dose statin and reported an additional reduction in LDL compared with the statin alone. The authors floated the possibility that the extract could allow a lower statin dose, but the trial was far too small to establish that, and no one should reduce a prescribed dose on the basis of it.
Blood sugar and other markers. Several trials also reported small reductions in fasting glucose. This is consistent with the flavonoid profile, since naringin and related compounds have been studied for metabolic effects, but the findings are preliminary and secondary to the lipid outcomes.
Why the Evidence Is Still Preliminary
The findings above are consistent and pointed in the same direction, which is encouraging. Several features of the research base should temper enthusiasm, though.
Sample sizes are small. Many trials enrolled a few dozen participants per arm. Small trials tend to overestimate effect sizes, and the wide spread of reported LDL reductions is a sign of that.
Replication is narrow. Most trials come from a small cluster of research groups, and some had funding or authorship links to companies that sell the extract. That does not make the results wrong, but independent replication in different populations is what would move this from “promising” to “established.”
Outcomes are surrogate markers. No trial has been large or long enough to look at what actually matters, which is whether taking bergamot changes the rate of cardiovascular events. The lipid changes are a reasonable proxy, but proxies have misled researchers before.
Duration is short. The longest published trials run months, not years. Long-term safety at supplemental doses is assumed from the fruit’s food history rather than demonstrated.
If you want a framework for reading these kinds of studies critically, our guide on how to read supplement research covers the questions to ask.
Dosing in the Studies
The trials used 500 to 1,000 mg per day of standardized extract, most often split into two doses taken shortly before the two largest meals. The higher end produced larger changes in the dose-ranging trial. Effects were measured at 30 days in the shortest trials and at 90-120 days in the longer ones, so anyone trying it should plan on at least a month, and preferably three, before drawing conclusions from a lipid panel.
Bergamot extract is sometimes combined with other ingredients in “cholesterol support” formulas, particularly with red yeast rice or plant sterols. Those combinations have not been studied together in any rigorous way, and red yeast rice in particular carries its own dosing and safety considerations that we discuss in our red yeast rice research brief.
Safety and Interactions
Bergamot extract was well tolerated across the published trials, with occasional reports of mild heartburn or digestive upset. A few practical cautions apply.
Grapefruit-type interactions. Bergamot contains furanocoumarins, the same family of compounds that makes grapefruit juice interfere with a long list of medications by inhibiting the CYP3A4 enzyme. Bergamottin, one of the most studied of these compounds, is literally named after the fruit. How much survives into a polyphenol-standardized extract is unclear and probably varies by product. If you take a medication that comes with a grapefruit warning, treat bergamot the same way until a pharmacist tells you otherwise. Our supplement drug interactions guide has more on this enzyme pathway.
Lipid and diabetes medications. Because bergamot may lower LDL and glucose, combining it with prescription drugs for the same purpose could produce additive effects. That sounds like a benefit, but it means dosing decisions belong with your prescriber, not with a supplement label.
Pregnancy and nursing. There is no safety data for concentrated bergamot extract in pregnancy or breastfeeding. Avoid it unless a provider specifically advises otherwise.
Photosensitivity. Bergamot oil applied to the skin is a well-known cause of sun sensitivity. This is an issue with the topical essential oil rather than the oral juice extract, but it is worth knowing if you use both.
Who Might Reasonably Consider It
The most defensible use case is someone with mildly elevated lipids who has been told by a provider that lifestyle change is the first step, and who wants a low-risk addition while they work on diet and activity. The candidate who should be most cautious is someone who has been prescribed a statin and is looking for a reason to stop. The evidence does not support that swap. Statins have decades of outcome data; bergamot has a few years of surrogate-marker data.
If you do try it, get a baseline lipid panel, take a standardized product for at least 8-12 weeks, and repeat the panel. Our guide on how to tell if a supplement is working walks through that kind of before-and-after approach. And keep the fundamentals in view: the dietary and exercise changes on our heart health supplements page will do more than any single extract.
Bottom Line
Citrus bergamot extract has consistent but preliminary evidence for modestly improving blood lipids at 500-1,000 mg per day over one to three months. The trials are small, short, and concentrated in a few research groups, with no data yet on hard cardiovascular outcomes. It appears well tolerated, though its grapefruit-like compounds warrant caution alongside certain medications. It is a reasonable experiment for someone with mild lipid concerns and a provider’s blessing, and it is not a replacement for prescribed treatment.
This article is educational and not medical advice. Consult a healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medication, or managing a health condition.