Cold-pressed canola oil and refined canola oil are not two versions of the same product at different price points. They are two fundamentally different products that happen to come from the same seed. Understanding the difference requires looking at what happens between the farm and the bottle, which is exactly what most oil brands in Pakistan prefer you do not examine.
The Two Ways Canola Oil Is Made
Every bottle of canola oil you have ever bought started the same way: canola seeds, grown on a farm. What happens after the seeds arrive at the production facility determines what you actually get.
Method 1: Cold Pressing The seeds are cleaned and fed into a mechanical screw press. Pressure is applied continuously as the seeds move through the press barrel. Oil flows out through perforations in the barrel wall. The entire process operates below 50 degrees Celsius. No chemical solvents are used at any stage. The oil is then filtered naturally and bottled.
Method 2: Solvent Extraction and Refining The seeds are crushed and then exposed to hexane, a petroleum-derived chemical solvent. Hexane bonds to oil molecules and extracts them from the seed material far more efficiently than mechanical pressing. The hexane is then evaporated off under heat. The resulting crude oil goes through four additional chemical refining stages before it is bottled.
Both bottles end up on the same shelf. One is labeled organic. One is labeled pure. Neither label tells you which process was used.
What Hexane Is and Why It Is Used
Hexane is a chemical derived from petroleum. In the oil industry, it is used as a solvent because it dissolves oil efficiently and can be evaporated off relatively cleanly. Using hexane to extract oil instead of mechanical pressing increases yield significantly, meaning more oil is extracted from the same amount of seed. This reduces production cost per litre substantially.
That is the entire reason hexane is used. It is an economics decision, not a quality decision.
The hexane itself is largely removed before the oil is bottled. Trace residue levels are regulated, and most commercial refined oils are within those regulatory limits. The issue is not primarily the hexane residue. The issue is what the combination of hexane extraction and subsequent heat refining does to the oil's natural composition.
What Heat Refining Does to the Oil
After hexane extraction, the crude oil goes through four chemical stages:
Degumming removes phospholipids from the oil using water or phosphoric acid. Phospholipids are natural compounds in the seed that also have nutritional value. They are removed because they cause the oil to become cloudy and reduce shelf stability.
Neutralization removes free fatty acids by treating the oil with sodium hydroxide (caustic soda). Free fatty acids affect flavor and shelf life. They are removed through alkali treatment, which generates soapstock as a byproduct.
Bleaching removes pigments, off-flavors, and residual impurities by passing the oil through bleaching clay at temperatures of 80 to 110 degrees Celsius. This stage is where most remaining natural antioxidants and carotenoids are removed.
Deodorization is the final and most damaging stage. The oil is exposed to high-pressure steam at temperatures of 200 to 230 degrees Celsius for several hours. This removes all remaining flavor and odor compounds, which is why refined canola oil is tasteless and odorless. It also destroys the heat-sensitive fatty acids and vitamin E that survived the earlier stages.
What remains after all four stages is a clear, neutral, shelf-stable oil that has been chemically processed at every step of its production.
Nutritional Comparison: Cold Pressed vs Refined
The canola seed naturally contains omega-3 fatty acids, omega-6 fatty acids, monounsaturated fats, and vitamin E. Cold pressing below 50 degrees Celsius preserves these compounds in the oil. The multiple days of natural settling process does not disturb them. What is in the seed ends up in the bottle.
Refining removes or damages most of these compounds across its four stages. The deodorization stage alone, at 200 to 230 degrees Celsius, causes significant degradation of omega-3 fatty acids and destroys most of the vitamin E naturally present in the crude oil.
Refined canola oil manufacturers often add synthetic vitamin E back to the product after refining. This is a legal and common practice. The label will say "contains vitamin E." It will not say that the natural vitamin E was destroyed in processing and a synthetic form was added afterward.
Cold-pressed canola oil contains the natural vitamin E that was always in the seed, in the form it was always in. The difference between natural and synthetic vitamin E and how the body uses each is a subject of ongoing research. What is not debated is which process removes the natural form and which one preserves it.
Reading an Oil Label in Pakistan
No Pakistani cooking oil brand is required to disclose their extraction method on the bottle. "Pure," "organic," "natural," and "cold pressed" are all terms that can appear on labels without standardized verification in Pakistan's current market. This is not unique to Pakistan. It is a global problem in the food oil industry.
What to look for instead:
"Cold pressed" with a stated temperature is more credible than "cold pressed" alone. If a brand says cold pressed but does not specify at what temperature, ask them.
"Expeller pressed" or "screw pressed" refers to mechanical extraction without solvents, which is more credible than no process description.
"Refined," "deodorized," "bleached," or "neutralized" on a label or in a product description confirms the oil has gone through industrial chemical processing.
No process description at all is the most common situation. When a brand does not tell you how the oil was made, the most likely explanation is that the process does not support the claims on the label.
Why Most Brands Do Not Explain Their Process
Transparency about production process is not commercially convenient for brands that use hexane extraction and heat refining. It is not illegal to use these methods. But explaining them in plain language to consumers would make the marketing significantly harder.
Cold-press producers have the opposite incentive. The process is the product. Explaining it in detail is the marketing.
At Asaal Organics, the production process is a screw press operating below 50 degrees Celsius, followed by multiple days of natural gravity settling, with no chemical solvents or heat refining at any stage. That process can be verified. The oil it produces can be tested. Those tests will show no hexane residue and a fatty acid profile consistent with minimally processed canola oil.
How to Choose
If you want oil with its natural fatty acid profile intact, choose cold-pressed. If you cook at very high temperatures consistently and prioritize a neutral flavor and long shelf life above nutritional integrity, refined canola oil is stable and widely available.
What you should not do is assume that "organic," "pure," or "natural" on a label tells you anything meaningful about the extraction method. Read the process, not the label claims.
Frequently Asked Questions
Is refined canola oil unsafe to eat? Refined canola oil is consumed by hundreds of millions of people and is within regulatory safety standards in most countries including Pakistan. The question is not safety in the sense of acute harm. The question is what you lose through the refining process and whether that matters to you.
Can I tell cold-pressed oil from refined oil by looking at it? Not reliably. Cold-pressed canola oil may be slightly darker or less perfectly clear than refined oil, but this varies. The most reliable indicators are flavor (cold-pressed has a mild natural taste, refined is neutral), and the brand's willingness to describe their production process in specific terms.
Is cold-pressed canola oil better for cooking than olive oil? Cold-pressed canola oil has a higher smoke point (approximately 190 to 200 degrees Celsius) than extra virgin olive oil (approximately 160 to 190 degrees Celsius), which makes it more suitable for the higher heat levels common in Pakistani cooking. It also has a milder flavor that does not compete with spices.
Does cold pressing cost more to produce? Yes. Mechanical pressing with a screw press yields approximately 30 to 40 percent less oil per kilogram of seed compared to hexane solvent extraction. The process is slower, the yield is lower, and natural multiple days of settling requires storage space. The higher production cost is the reason cold-pressed oil costs more per litre.
