Blended oil is a mixture of two or more vegetable oils combined to improve nutrition, cooking performance, or both. Instead of relying on a single oil source, manufacturers mix oils with complementary strengths, like pairing one that’s rich in omega-3 fats with another that handles high heat well. The result is a product designed to offer a better balance of fatty acids, a higher smoke point, or a longer shelf life than any of its individual ingredients could deliver alone.
How Blended Oils Are Made
The process is straightforward: oils are directly mixed in specific proportions. A manufacturer might combine 60% olive oil with 30% sesame oil and 10% flaxseed oil, for example, adjusting the ratios to hit a target nutritional profile or price point. Blending is considered one of the simplest and most economical ways to modify the fatty acid composition of a cooking oil without any chemical alteration.
In India, food safety regulations define a blended (or “multi-source edible”) oil as an admixture of any two edible vegetable oils where each oil makes up at least 20% of the blend by weight. Labels must reflect this, and health claims on the packaging can only reference a specific oil if that oil accounts for the majority of the blend. Other countries have their own labeling rules, but the general principle is similar: the ingredients and their proportions should be clearly identified.
Why Oils Get Blended
Most common cooking oils, including corn, sunflower, rice bran, and grapeseed, are heavy in omega-6 fatty acids. The typical ratio of omega-6 to omega-3 in these oils ranges from 8:1 to as high as 50:1 for sesame oil. That’s far above the optimal range of 1:1 to 4:1 recommended in nutritional research. Blending allows manufacturers to pull that ratio back into a healthier range by adding an omega-3-rich oil like flaxseed (which has a ratio of just 0.22:1) to a more common base oil.
This works well in practice. When researchers blended olive oil, sesame oil, and flaxseed oil in a 55:30:15 ratio, the resulting blend had an omega-6 to omega-3 ratio of 2.1:1, well within the optimal zone. Even a smaller addition of 10% flaxseed oil brought a blend down to 2.9:1. You get the cooking-friendly properties of the base oil with the nutritional boost of flaxseed, which would be impractical to use on its own for everyday cooking.
Stability and Shelf Life
Oils high in omega-3 fats, like flaxseed oil, break down quickly when exposed to heat or air. Pure flaxseed oil has very low oxidative stability, which is the main barrier to using it as a cooking oil. Blending it with more stable oils like palm olein or rice bran oil solves this problem. In lab testing, blends of flaxseed with palm olein and rice bran oil maintained low acid values (a measure of oil degradation) even after four hours of continuous heating at 180°C. Rancimat testing, a standard method for measuring how long an oil resists going rancid, confirmed that these blends were significantly more stable than pure flaxseed oil.
Common Oil Combinations
The specific blend you’ll find depends on the manufacturer’s goals and the regional market. Some of the most widely available combinations include:
- Rice bran and safflower oil: A popular combination in parts of Asia. Rice bran oil contains compounds called gamma-oryzanol and tocotrienols that help lower cholesterol, and blending it with safflower oil may amplify that cholesterol-lowering effect.
- Olive and flaxseed oil: Pairs olive oil’s high monounsaturated fat content with flaxseed’s omega-3 concentration. Even a 10 to 15% addition of flaxseed brings the omega-6 to omega-3 ratio into the recommended range.
- Sunflower and soybean oil: A common economical blend that balances cost with a broad fatty acid profile.
- Multi-oil specialty blends: Some products mix five or six oils. One research blend combined sunflower (30%), olive (20%), macadamia (15%), flaxseed (15%), rosehip (10%), and blackcurrant oil (10%) to achieve a specific therapeutic fatty acid profile rich in oleic, linoleic, and linolenic acids.
Cooking With Blended Oil
A refined vegetable oil blend typically has a smoke point around 220°C (428°F), which puts it in the same range as refined cottonseed oil and just above refined canola oil at 204°C (400°F). That makes most commercial blended oils suitable for sautéing, stir-frying, and deep-frying. Pure corn oil and soybean oil smoke at slightly higher temperatures (230 to 238°C), so if you’re doing very high-heat cooking, check whether the blend’s smoke point fits your needs.
The smoke point of a blend generally reflects the properties of its dominant oil. A blend that’s mostly refined sunflower oil will perform similarly to pure refined sunflower oil in a pan. The smaller-proportion oils shift the nutritional profile more than they change cooking behavior.
Nutritional Considerations
The U.S. Dietary Guidelines recommend that total fat make up 20 to 35% of daily calories, with saturated fat kept below 10%. The guidelines specifically encourage cooking with oils high in polyunsaturated and monounsaturated fats, listing canola, corn, olive, peanut, safflower, soybean, and sunflower as good choices, while flagging coconut and palm oils as higher in saturated fat.
Blended oils fit neatly into these recommendations because they’re typically built from the oils on that approved list. The advantage over picking a single oil is balance. Olive oil is roughly 69% monounsaturated fat but low in omega-3s. Flaxseed oil is 57% omega-3 but low in monounsaturated fat. A blend can deliver meaningful amounts of both.
Some blended oils are also enriched with plant sterols, compounds that actively lower cholesterol absorption. In studies on people with high cholesterol, fish oil enriched with plant sterols produced the lowest total cholesterol, LDL, and triglyceride levels compared to plain olive oil or fish oil alone. While most grocery store blends won’t contain added sterols, some premium or functional blends do, and the label will indicate it.
How to Choose a Blended Oil
Read the ingredient list and look for the proportions of each oil. A blend where the first listed oil is canola or sunflower and the second is olive or flaxseed will give you a good mix of monounsaturated and polyunsaturated fats at a reasonable price. If the label lists a less desirable oil (palm, palm kernel, or coconut) as a major component, the saturated fat content will be higher.
Price is a legitimate reason to choose a blend. Olive oil and flaxseed oil are expensive on their own. A blend that uses a more affordable base oil like sunflower or soybean, with a smaller percentage of a premium oil, can deliver much of the nutritional benefit at a fraction of the cost. This was one of the original motivations behind commercial blending: producing oils with desirable biological properties at affordable prices.