Bergamot Extract: Polyphenols and What's Really Behind Them

Most people know bergamot as the fragrance note in Earl Grey tea or from perfumery. Less well known is that the peel and juice of the fruit contain an unusually high concentration of polyphenols. It's precisely from these that bergamot extract is obtained, which is increasingly in demand as a food supplement. However, plenty of bold claims circulate around this extract. In this guide we therefore take a factual look at what really lies behind the extract and its plant compounds, and what matters when buying it.

What is bergamot extract?

Bergamot (botanically Citrus bergamia) is a small, bitter citrus fruit grown almost exclusively on the coast of Calabria in southern Italy. The local interplay of soil, climate and sea air is considered the reason why roughly 80 percent of the world's harvest comes from this one region. The fruit itself is too sour and bitter to eat directly, which is why traditionally it was mainly the essential oil from the peel that was used.

Bergamot extract for food supplements is something different from the essential oil. It is obtained from juice and pulp and concentrated in such a way that the water-soluble plant compounds are enriched, while the oil-containing components are largely removed. The result is a powder that is standardised to a specific polyphenol content. In the scientific literature it frequently appears under the abbreviation BPF, short for Bergamot Polyphenolic Fraction.

The history behind it is interesting: for centuries, bergamot was used almost exclusively as a raw material for the fragrance industry. The juice left over from oil extraction was long regarded as a by-product. Only once researchers examined the unusual flavonoid profile of this juice more closely did it come into view as a raw material for food supplements in its own right. It's precisely this shift from residual material to standardised extract that explains why the topic has only gained wider attention in recent years.

Bergamot's polyphenols in detail

Polyphenols are a large group of secondary plant compounds found in many fruits and vegetables, giving plants their colour and flavour, among other things. They are among the substances that have been closely studied in nutrition research for years, because plant-rich diets go hand in hand with a high polyphenol intake. Citrus fruits are generally rich in flavonoids, an important subgroup of polyphenols. Bergamot stands out here for its distinctive pattern and comparatively high concentration.

Five flavonoids are characteristic of the extract and together form the core of the BPF: naringin, neohesperidin, neoeriocitrin, and the two substances brutieridin and melitidin. The latter two are what's genuinely special, since in this form they occur almost exclusively in bergamot and were first described in fruit from Calabria. Chemically, brutieridin and melitidin carry a structural unit that is distantly reminiscent of the body's own metabolic building blocks. This has made the substances a popular subject of research. A sober classification is important here: such descriptions concern laboratory observations and molecular structure, not a proven effect in everyday human life.

Why the content varies so much

The polyphenol content of an extract depends on many factors: harvest time, degree of ripeness, the part of the fruit used and, above all, the production method. That's why two products both labelled "bergamot" aren't automatically comparable. Reputable suppliers state the content specifically, for example as a percentage of polyphenols or flavonoids per serving. High-quality extracts are often standardised to more than 30 to 40 percent flavonoids. Without such a statement, it remains completely unclear how much of the actually interesting plant compound a capsule delivers at all. A low-concentration powder can carry the same name as a highly standardised extract and still contain a fraction of the flavonoids. So for comparison, what counts is not the gram figure on the front of the pack but the standardisation in the small print.

How does bergamot extract act in the body?

Care is called for here, because many oversimplified claims about bergamot circulate online. What can be said responsibly is this: polyphenols are among the plant compounds that play a role as part of a varied, plant-forward diet. Bergamot's flavonoids are absorbed and metabolised in the digestive tract, similar to other flavonoids from citrus fruits or berries.

For specific health-related claims about individual plant compounds such as bergamot polyphenols, there are no health claims authorised by the relevant EU authority. In very practical terms, that means bergamot extract is a food, or a food supplement, and not a medicine. It must not, and is not intended to, treat or cure any disease. Anyone who comes across promises about specific blood values in connection with bergamot should question them critically. The studies that exist are the subject of ongoing research and do not replace a doctor's assessment.

The honest framework

A food supplement is always just that – a supplement, not a substitute for lifestyle and diet. Anyone who wants to do something for their cardiovascular system will find the most effective levers in the basics: plenty of vegetables, legumes, healthy fats, exercise, not smoking, and a healthy body weight. Our guides on Nutrients for the Heart and Nutrients for Healthy Blood Vessels give a well-founded overview of which building blocks play a role here.

Forms and dosages: capsules, powder, combinations

Bergamot extract is most commonly offered as a capsule, less often as loose powder. The capsule form has the advantage of a defined serving size and masks the often bitter flavour of the raw material. Typical daily servings usually fall in the range of a few hundred milligrams of extract, depending on standardisation; however, what matters is less the sheer amount of extract than the stated polyphenol or flavonoid content.

Combination products, in which bergamot is blended with other plant compounds or vitamins, are also widespread. Such combinations can make sense, but they make it harder to work out how much pure bergamot polyphenol is actually contained. Anyone who wants to take bergamot extract in a targeted way is better off, in terms of transparency, with a clearly declared single-ingredient product.

Loose powder offers more flexibility when it comes to portioning and can be stirred into water or a smoothie, for example. The price for this is the pronounced bitter taste that the fruit brings with it. In practice, most users therefore reach for the capsule, while powder tends to suit people who put together their own supplements anyway and are willing to accept the taste.

Intake and everyday use

For intake, it's advisable to follow the instructions on the packaging. Many users take bergamot capsules with a meal, which avoids the bitter aftertaste and may support the absorption of fat-soluble accompanying compounds. A fixed time of day helps you remember to take it.

One point worth noting, which comes up again and again with citrus extracts: grapefruit and related citrus fruits can affect how certain medications are metabolised. Even though bergamot juice extract has a different composition from grapefruit, the cautious approach applies: anyone taking medication regularly, who is pregnant or breastfeeding, should discuss use with a doctor beforehand. This isn't a cause for concern, simply sensible practice when handling concentrated plant compounds.

An important note on blood values

Bergamot is frequently mentioned online in connection with cholesterol. So let's be clear on this point: elevated cholesterol or blood lipid levels belong in a doctor's hands. They can only be established through a blood test and should be professionally assessed and, if necessary, treated. A food supplement is no substitute for that. The foundation always remains a heart-healthy diet and regular exercise, accompanied by medical monitoring.

Recognising quality: what to look for when buying

Because the market is hard to overview, a closer look pays off. These are the points that matter:

• Standardised polyphenol content: A good product states the content of polyphenols or flavonoids specifically per serving, rather than just advertising with the word "bergamot".
• Origin: bergamot from Calabria is considered the benchmark, because that's where the characteristic flavonoids brutieridin and melitidin occur naturally.
• Clear declaration: the part of the fruit used, the extract ratio and the ingredient list should be traceable, without unnecessary fillers.
• Transparent manufacturer: information on testing, batch checks and purity builds trust.

Incidentally, this quality logic isn't unique to bergamot. Similar criteria apply to many high-quality food supplements. We show how to approach such questions systematically, using an example, in the guide Buying Omega-3: What to Look For.

Frequently asked questions (FAQ)

What's the difference between bergamot extract and essential bergamot oil?

The essential oil is pressed from the peel and contains mainly fragrance and aroma compounds; it's intended for aromatherapy and perfumery, not for oral food supplementation. Bergamot extract in capsules, by contrast, is obtained from juice and pulp and standardised to water-soluble polyphenols.

What are brutieridin and melitidin?

These are two flavonoids that, in this form, occur almost exclusively in bergamot and were first described in fruit from Calabria. They are among the five marker compounds of the bergamot polyphenol fraction and are known mainly from basic research.

How much bergamot extract should you take daily?

There is no generally fixed amount. Follow the serving recommendation of the specific product, paying attention less to the sheer amount of extract than to the stated polyphenol or flavonoid content. Do not exceed the recommended daily dose.

Can I combine bergamot extract with medication?

If you take medication regularly, or are pregnant or breastfeeding, you should discuss use with a doctor beforehand. Citrus extracts can affect the metabolism of certain medicines, so a brief consultation is the safe way to go.

Does bergamot extract replace a healthy diet?

No. Bergamot extract is a food supplement and not a substitute for a balanced diet, exercise or medical treatment. The most effective foundation for the heart and blood vessels remains a healthy lifestyle.