The primary research behind olive oil polyphenols, with full citations — study type, journal, year, and DOI on every entry. This map grows as new trials and meta-analyses publish; we add studies with full citations, never bare claims.
Important: a study finding is not a permitted marketing claim. The only authorized EU claim for olive oil polyphenols concerns the protection of blood lipids from oxidative stress, with a daily-intake condition.
Regulatory scientific opinion · 2011
Established the cause-and-effect basis for the authorized EU claim: olive oil polyphenols (≥5 mg hydroxytyrosol and derivatives per 20 g daily) contribute to the protection of blood lipids from oxidative stress.
EFSA Panel on Dietetic Products, Nutrition and Allergies · EFSA Journal (2011) · doi:10.2903/j.efsa.2011.2033
Randomized controlled trial (n≈7,400) · 2018
A Mediterranean diet supplemented with extra-virgin olive oil was associated with a lower rate of major cardiovascular events than a reduced-fat control diet. An association in a dietary-pattern trial — not an authorized claim for any single product.
Estruch R, et al. · New England Journal of Medicine (2018) · doi:10.1056/NEJMoa1800389
Randomized crossover trial (n=200) · 2006
Higher-polyphenol olive oils produced dose-dependent improvements in HDL cholesterol and markers of oxidative damage compared with low-polyphenol olive oil. Note: EFSA has not authorized an HDL claim for olive oil polyphenols.
Covas MI, et al. (EUROLIVE Study Group) · Annals of Internal Medicine (2006) · doi:10.7326/0003-4819-145-5-200609050-00006
Laboratory study · 2005
Identified oleocanthal as the compound behind fresh olive oil's throat sting and showed it inhibits COX enzymes in vitro, similar in mechanism to ibuprofen. A mechanistic finding, not a clinical outcome.
Beauchamp GK, et al. · Nature (2005) · doi:10.1038/437045a