Is olive oil a seed oil?

No. Olive and avocado oil are pressed from the fruit rather than the seed, and extra virgin olive oil is not refined at all. Optimally does not flag olive oil as a seed oil.

Does "high oleic" make a difference?

High oleic sunflower and safflower oils are bred to contain more oleic acid and less linoleic acid, so they are more stable at heat. They are still refined seed oils and still declared as such.

Is "vegetable oil" always a seed oil?

Not necessarily. Palm and coconut oil count as vegetable oils too. The specific oils should be named in brackets after the group name, so read those. What the label may not tell you is which of the listed oils is in your pack, or how much of each.

All guidesHow to

How to spot seed oils on a label

What are seed oils called on ingredient lists?

The short answer

Look for sunflower, safflower, soybean, corn, canola, rapeseed, cottonseed, grapeseed and rice bran oil. Then read the brackets after "vegetable oil" or "vegetable fat": in the US and the EU the individual oils have to be named there. What those rules still allow is flexibility. A US label can list oils a product might contain using "and/or", and EU and UK labels can add "in varying proportions", so the mix in your pack can change between batches. An oil in the first three ingredients is a major part of the product.

Optimally flags each of those oils by name, including when they sit inside a group name, and rates every other ingredient on the label as well.

Download on the
App StorePaid subscription. Requires iOS.

The full list of names

Industrial seed oils are extracted at high temperature, usually with a solvent, and refined, bleached and deodorised before they reach a product. On an ingredient list they appear as any of these:

Sunflower oil, high oleic sunflower oil
Safflower oil
Soybean oil, soya oil
Corn oil, maize oil
Canola oil, rapeseed oil, low erucic acid rapeseed oil
Cottonseed oil
Grapeseed oil
Rice bran oil
The group names: vegetable oil, vegetable oils, vegetable fat. The specific oils should follow in brackets.

Hydrogenated versions of all of the above count too.

What “vegetable oil” does and does not hide

Both US and EU rules let refined oils be declared together under a group name, but the individual oils still have to be named straight after it. So "vegetable oils (rapeseed, sunflower, palm)" is a normal compliant label, and "vegetable oil" with nothing after it is not. In the EU a group of oils takes its place in the ingredient list by their combined weight.

What the rules do allow is flexibility. In the US, a manufacturer that cannot keep a blend constant may list oils the product might contain, marked "and/or" or "contains one or more of the following", for oils that are not the main ingredient. EU and UK labels can add "in varying proportions". Either way the label tells you which oils are possible, not which one is in the pack in your hand, or how much of each.

If you do see "vegetable oil" with nothing after it, either the label is incomplete or the database you are reading dropped the brackets when the product was entered. Either way, turn the pack over and read it.

Where they turn up when you are not expecting them

Nobody is surprised to find seed oil in crisps. The places people miss are bread and wraps, tinned fish, hummus and dips, pesto and jarred sauces, most mayonnaise and salad dressing, protein and cereal bars, roasted nuts, and a lot of takeaway fried food.

The pattern is that the oil is there as a cheap fat with a neutral taste and a long shelf life, so it shows up wherever a product needs one of those three things.

What the evidence actually says, including the part that cuts the other way

This is worth being straight about, because the seed oil argument online usually is not. The strongest single piece of evidence is a recovered-data analysis of the Minnesota Coronary Experiment, published in the BMJ in 2016. Replacing saturated fat with linoleic acid did lower serum cholesterol, and it did not reduce death from coronary heart disease or from any cause.

That is a finding about an overstated benefit. It is not a demonstration that seed oils are toxic, and anyone telling you it is has not read it. The honest position is that the case for replacing other fats with these oils is weaker than it was presented, and that the products they are most common in are usually ultra-processed for other reasons as well.

Optimally scores them accordingly. The seed-oil penalty is real and it is deliberately lighter than the ones applied to ultra-processing and to sugar, because the evidence behind it is weaker. Rating them as the worst thing on a label would be easier to market and harder to defend.

Worked examples

Real products, scored by the app itself, with every reason the engine gave.

Common questions

Is olive oil a seed oil?: No. Olive and avocado oil are pressed from the fruit rather than the seed, and extra virgin olive oil is not refined at all. Optimally does not flag olive oil as a seed oil.
Does "high oleic" make a difference?: High oleic sunflower and safflower oils are bred to contain more oleic acid and less linoleic acid, so they are more stable at heat. They are still refined seed oils and still declared as such.
Is "vegetable oil" always a seed oil?: Not necessarily. Palm and coconut oil count as vegetable oils too. The specific oils should be named in brackets after the group name, so read those. What the label may not tell you is which of the listed oils is in your pack, or how much of each.

Last reviewed 14 September 2026.