A generic supermarket category for refined plant-derived cooking oils — usually a blend of soybean, canola, corn, sunflower, or palm — neutral, cheap, and high-heat capable.
A category, not a specific oil
“Vegetable oil” on a label rarely means anything precise. In the United States it usually means soybean oil (the country’s biggest single edible oil). In other regions or with mixed bottles, it may be canola, sunflower, corn, palm, or any blend the bottler has chosen for cost.
Why it dominates
Vegetable oil is cheap, neutral in flavor, has a high smoke point (around 230 °C / 450 °F when refined), and stays shelf-stable for many months. For frying, baking, and in commercial mayonnaise, salad dressings, and margarines, it’s the workhorse oil.
How it’s made
Industrial vegetable oil production typically goes:
- Crushing seeds or beans
- Solvent extraction with hexane to recover the oil from the meal
- Degumming, neutralizing, bleaching, deodorizing — the RBD process — to produce a clear, near-flavorless product
Cold-pressed and unrefined versions exist in specialty form but rarely under the “vegetable oil” label.
Health and reformulation
The makeup of “vegetable oil” matters more than the name. Soybean and corn oils are high in omega-6 linoleic acid; canola is higher in monounsaturates and contains some omega-3. The 2000s and 2010s saw widespread reformulation away from partially hydrogenated oils after trans fats were linked to cardiovascular disease.