Polyphenols: the whole point of olive oil
The science · 5 min read · 2026-07-10
Polyphenols are the antioxidant compounds that give real olive oil its bitterness and peppery sting. They are the reason olive oil is healthy, they are the only olive-oil benefit the EFSA has authorised, and refining, heat and time destroy them.
Key points
- The key polyphenols are hydroxytyrosol, tyrosol and oleocanthal.
- They protect blood lipids from oxidative damage. This is the one EFSA-authorised olive-oil health claim.
- They are fragile: heat, light, refining and age all destroy them.
- Bitterness and a peppery throat catch are the taste of the polyphenols still being there.
When people talk about the health benefits of olive oil, they usually mean one thing without knowing it: polyphenols. These are the antioxidant compounds that give a real extra virgin oil its bitterness and its peppery sting. They are also the part that does the work, and the part almost every supermarket oil is missing.
What polyphenols are
Polyphenols are plant compounds the olive tree makes to protect its fruit. In oil, the important ones are hydroxytyrosol, tyrosol and oleocanthal. They are fragile: heat, light, refining and time all destroy them. An oil can legally be called extra virgin and still contain almost none, because the label does not have to tell you. That gap between the grade and the reality is covered in extra virgin vs refined.
Protecting your blood lipids
The European Food Safety Authority has authorised a single olive-oil health claim, and it is specifically about polyphenols: they help protect blood lipids from oxidative stress. In plain terms, they help keep your cholesterol from oxidising, which is one of the early steps in cardiovascular disease. The catch is the dose. The claim only holds for oils delivering at least 5 mg of hydroxytyrosol and its derivatives per 20 g of oil, a bar most oils never clear.
Why bitterness is a good sign
If your olive oil tastes smooth and buttery, it is telling you something: the polyphenols are largely gone. A fresh, high-phenolic oil is green, bitter and lively, and it catches at the back of your throat. That catch is not a defect. It is the taste of the very compounds you are paying for, and one of them acts on the same pathway as ibuprofen, as covered in oleocanthal.
This is the entire reason WOW Longevity exists: to deliver an oil that still has them. Every bottle of our oil carries 190 mg of polyphenols per 15 ml serving, cold-pressed within hours of harvest and bottled unfiltered so nothing is stripped out.
Common questions
What are polyphenols in olive oil?
They are antioxidant plant compounds, chiefly hydroxytyrosol, tyrosol and oleocanthal, that the olive tree produces to protect its fruit. They give real olive oil its bitterness and peppery finish and carry its health benefits.
What do olive oil polyphenols do?
They help protect blood lipids from oxidative damage, which is the only olive-oil health claim authorised by the European Food Safety Authority. They are also linked to lower inflammation.
How many polyphenols should olive oil have?
The EFSA claim requires at least 5 mg of hydroxytyrosol and its derivatives per 20 g of oil. Many supermarket oils fall below this. WOW Longevity carries 190 mg of polyphenols per 15 ml serving.
Why is high-polyphenol olive oil bitter?
Because the polyphenols themselves taste bitter and peppery. The bitterness and the throat catch are a direct signal that the active compounds are still present.
Keep reading
WOW Longevity high-polyphenol olive oil