Olive-pomace oil slows down spread of HIV
The leftover paste from an olive mill is not waste to a chemist. It holds triterpene compounds — maslinic and oleanolic acid — that show interesting activity in the lab. That is genuinely worth knowing, provided we keep it firmly in proportion.
When olives are pressed, oil and water run off and a solid paste of skins, pulp and crushed stones is left behind. This is pomace — orujo in Spanish, grignon in French. Traditionally it was low-value stuff: a further, solvent-assisted extraction yields refined olive-pomace oil (the cheapest grade, fit for high-heat frying), and the rest fed fires or livestock. But the skins in particular are rich in interesting molecules, and that is where the science — and the hype — begins.
What is actually in the skins
Olive skin wax carries pentacyclic triterpenes, chiefly maslinic acid (also called crataegolic acid) and oleanolic acid. These are being studied for antioxidant and anti-inflammatory activity, mostly in test-tube (in vitro) and animal experiments, using assays that measure how well a compound mops up free radicals. Researchers have valorised pomace as a source of these molecules because extracting them turns a waste stream into something potentially useful. That part is solid: pomace is a real, cheap reservoir of these triterpenes.
Where the headlines overreach
Early-2000s reports tied maslinic acid to dramatic claims — slowing viral spread, fighting parasites, and so on — usually based on cell-culture or animal studies. It is vital to read those correctly. Activity in a dish of cells or in a rat is a starting point for research, not evidence that eating pomace oil does anything of the sort in a person. Many compounds that look promising in vitro fail in humans, or never reach the bloodstream in a meaningful dose from food. No olive product is a treatment for any infection or disease.
| What pomace is | Paste of skin, pulp and stones left after pressing |
|---|---|
| Also called | Orujo (Spanish), grignon (French) |
| Key compounds | Maslinic acid, oleanolic acid (triterpenes) |
| Where studied | Mostly in vitro and animal models |
| Evidence level | Preliminary — not clinical proof in humans |
| Pomace oil grade | Refined, lowest grade; for high-heat frying |
The honest takeaway
Pomace is a good example of the circular economy in the olive world: a by-product turned into cheap frying oil and, increasingly, a feedstock for extracting useful molecules studied by industry and universities. Find that genuinely interesting — but do not buy pomace oil as medicine. As a food it is a low grade with little of the flavour or antioxidant benefit of fresh extra virgin. This is general information, not medical advice; nothing here describes a treatment for any illness.
Points to keep straight
- Pomace is the leftover paste; refined pomace oil is the cheapest grade, for high-heat frying.
- Its skins carry triterpenes (maslinic, oleanolic acid) of research interest.
- The evidence is lab-stage — in vitro and animal, not proof of benefit in people.
- No olive product treats any disease; buy fresh extra virgin for flavour and antioxidants.
Olive pomace and its compounds: common questions
What is olive pomace?
The solid paste of skins, pulp and crushed stones left after olives are pressed for oil. It is called orujo in Spanish and grignon in French.
What is olive-pomace oil?
A refined, low-grade oil solvent-extracted from that leftover paste. It is cheap and heat-stable, suited to frying, not to raw finishing.
What is maslinic acid?
A triterpene compound found in olive-skin wax, studied for antioxidant and anti-inflammatory activity, mostly in laboratory and animal experiments.
Does pomace oil have health benefits?
Its compounds are of research interest, but the evidence is preliminary and lab-based. It is not a treatment, and as food it is a low grade.
Can olive products treat infections or disease?
No. Lab activity is not proof of benefit in people. This is general information, not medical advice.
Here is the sober read. Olive pomace being mined for useful molecules is a genuinely good story about wasting less of the olive — but it is a laboratory and industry story, not a health claim for your kitchen. When you see a compound like maslinic acid tied to dramatic disease headlines, assume cell-culture or animal work until proven otherwise, and treat pomace oil as what it is: the cheapest frying grade, with little of the flavour or antioxidants of fresh extra virgin. This is general information, not medical advice.
Drawn from research on olive-pomace triterpenes (maslinic and oleanolic acid); preliminary in vitro and animal work. General information, not medical advice.