How do you check if a product has seed oils?
Short answer
Scan the barcode with a food scanner app, which reads the parsed ingredient list and flags every seed oil by name in about a second. Reading the label manually works too, but you have to know all the aliases — rapeseed, colza, LEAR oil and generic 'vegetable oil' are all canola or a blend of seed oils.
The fast way: scan the barcode
Point a scanner app at the barcode. Olive Detective matches the product against Open Food Facts, reads its parsed ingredient taxonomy, and lists every seed oil it detects along with an overall 0–100 score. Because it reads the taxonomy rather than raw text, the same flag fires whether the label says sunflower oil, huile de tournesol or Sonnenblumenöl.
If the barcode is not in the database, point the camera at the ingredients panel instead and the app reads the text directly.
The manual way: the aliases to know
- Canola oil = rapeseed oil = colza oil = LEAR oil
- Soybean oil = soya oil = soy oil
- Corn oil = maize oil
- Grapeseed oil = grape seed oil
- 'Vegetable oil', 'vegetable oil blend', 'may contain one or more of' — an undisclosed mix, assume seed oils
- 'Partially hydrogenated' anything — a seed oil, with trans-fat concerns on top
Where people get caught out
Three places, consistently. Natural-brand chips and crackers, which very often use sunflower or safflower oil. Nut butters and roasted nuts, where an oil is added during roasting. And restaurant food, which has no label at all — the fryer is almost always soybean, canola or cottonseed oil unless the restaurant advertises otherwise.
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Last updated 26 August 2026.
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