Canola oil does not appear to be inflammatory based on the available clinical evidence. Meta-analyses of controlled human trials have found no changes in C-reactive protein, the most widely used blood marker for systemic inflammation, with canola oil consumption. Its fatty acid profile, low in saturated fat and relatively rich in omega-3s compared to other vegetable oils, positions it as one of the less likely cooking oils to promote inflammation.
Still, the question deserves a closer look. The answer depends on what you’re comparing canola oil to, how it’s processed, and how you use it in your kitchen.
What Clinical Trials Show About Inflammation
Two systematic reviews have specifically examined canola oil’s effects on inflammatory markers in humans. One, published in 2020, focused on C-reactive protein (CRP), a protein your liver produces in response to inflammation. The other, from 2013, looked at a broader panel including CRP, interleukin-6, tumor necrosis factor-alpha, and several markers of blood vessel inflammation. Neither found that canola oil raised these markers.
A large meta-analysis of 42 controlled clinical trials, published in Nutrition, Metabolism and Cardiovascular Diseases, found that canola oil significantly lowered total cholesterol, LDL cholesterol, and several other cardiovascular risk markers compared to other edible oils. These improvements were seen even when canola oil was compared head-to-head with olive oil and sunflower oil. Chronic elevation of LDL cholesterol contributes to arterial inflammation over time, so an oil that lowers LDL may indirectly reduce one driver of inflammatory disease.
That said, canola oil is not identical to extra virgin olive oil when it comes to inflammation in specific conditions. In a study of patients with ulcerative colitis, an inflammatory bowel disease, extra virgin olive oil significantly reduced both CRP and erythrocyte sedimentation rate (another inflammation marker), while canola oil did not produce the same benefit. Extra virgin olive oil contains polyphenols, antioxidant compounds largely absent from refined canola oil, that have their own anti-inflammatory effects.
Why the Fatty Acid Profile Matters
Canola oil is roughly 62% oleic acid, a monounsaturated fat that’s also the primary fat in olive oil. It contains about 19% omega-6 fatty acids and 9% omega-3 fatty acids (as alpha-linolenic acid), with only 7% saturated fat. That saturated fat content is the lowest of any common cooking oil.
The ratio of omega-6 to omega-3 fats is where canola oil genuinely stands out. At roughly 2:1, it has the most favorable ratio among common vegetable oils. For comparison, olive oil sits around 13:1, and corn oil reaches 52:1. This matters because omega-6 fats, while essential, can promote inflammatory signaling when consumed in large excess relative to omega-3s. A diet heavy in corn oil, soybean oil, or sunflower oil tilts the balance toward omega-6, while canola oil keeps it closer to even.
Monocyte research (studying a type of white blood cell involved in arterial plaque formation) has shown that oils with higher omega-6 to omega-3 ratios tend to stimulate more inflammatory immune activity. Canola oil triggered the least inflammatory monocyte response among the vegetable oils tested.
How Processing Affects the Oil
Most canola oil on grocery shelves is refined, bleached, and deodorized. This is where legitimate concerns about inflammation come in, though the picture is more nuanced than social media claims suggest.
During deodorization, the oil is heated to high temperatures to remove odors and flavors. This step can convert some of the polyunsaturated fats into trans fats, which are genuinely inflammatory. Research on canola oil processing has found that trans fat content can rise from 0.1-0.3% in crude oil to as high as 5% in some refined oils, entirely due to the deodorization step. Modern processing techniques have reduced this number, but refined canola oil will contain more trans fats than cold-pressed or expeller-pressed versions.
Hexane, a chemical solvent, is used to extract oil from canola seeds in conventional processing. The amount of hexane remaining in finished canola oil is extremely small. Testing of commercial rapeseed oil found a maximum residue of 0.043 mg/kg, well below the EU safety limit of 1 mg/kg. This is a trace amount unlikely to have any biological effect.
Refining also strips away some of the oil’s beneficial compounds. Canola oil naturally contains phytosterols (plant compounds that block cholesterol absorption) and vitamin E in the form of tocopherols. Refined canola oil retains some of these, but less than cold-pressed or expeller-pressed versions.
Stability During Cooking
An oil that breaks down quickly at high heat generates oxidation byproducts, compounds that can trigger inflammation when consumed regularly. Regular canola oil has a smoke point of about 204°C (400°F), making it suitable for most home cooking.
In a 12-day rotational frying study at 185°C, regular canola oil accumulated polar compounds (the primary measure of oil degradation) at roughly the same rate as soybean oil, reaching 27% after 6 days. Modified canola oils with higher oleic acid and lower linolenic acid performed significantly better, forming polar compounds 40% more slowly and staying below the threshold at which commercial fryers would discard the oil. The natural antioxidants in high-oleic canola oil lasted about three times longer than those in soybean oil during repeated frying.
For typical home use, where you’re not reusing the same oil for days, regular canola oil is stable enough for sautéing, baking, and occasional frying. If you deep-fry frequently and reuse oil, a high-oleic variety holds up considerably better.
How Canola Oil Compares to Other Oils
- Versus extra virgin olive oil: Olive oil has stronger anti-inflammatory properties due to its polyphenol content. For salad dressings and low-heat cooking where you want active anti-inflammatory compounds, olive oil is the better choice. For high-heat cooking, refined canola oil is more practical and more affordable.
- Versus corn or soybean oil: Canola oil has a dramatically better omega-6 to omega-3 ratio (2:1 versus 52:1 for corn oil). If you’re trying to reduce omega-6 intake, replacing corn or soybean oil with canola oil is a meaningful change.
- Versus saturated fats (butter, coconut oil): Clinical trials show canola oil significantly improves cholesterol markers compared to saturated fats, reducing total cholesterol by about 0.59 mmol/L and LDL cholesterol by 0.49 mmol/L. The greatest cardiovascular benefits in trials appeared when canola oil provided about 15% of total daily calories.
The Bottom Line on Inflammation
Canola oil is not inflammatory in the way that trans fats or excessive omega-6 consumption are inflammatory. Human trials consistently show neutral effects on inflammatory blood markers and positive effects on cholesterol. Its omega-6 to omega-3 ratio is the best among common vegetable oils, and it performs reasonably well under cooking heat.
Where the nuance lies is in what you’re replacing. Swapping butter or corn oil for canola oil is likely a net benefit. Swapping extra virgin olive oil for canola oil means losing polyphenols with genuine anti-inflammatory activity. If you use canola oil as your everyday cooking oil and extra virgin olive oil for dressings and finishing, you’re covering both bases. Choosing cold-pressed or expeller-pressed canola oil when possible avoids the small amount of trans fats generated during industrial refining.