Rice bran oil is a cooking oil extracted from the hard outer layer of rice grains, the same brownish coating that gets removed to turn brown rice into white rice. It’s popular across Asia, particularly in Japan, India, and South Korea, and has gained attention elsewhere for its high smoke point, mild flavor, and unusually rich mix of antioxidants. About 75 to 78% of its fat is unsaturated, placing it in a similar nutritional tier as canola and peanut oil.
How Rice Bran Oil Is Made
When rice is milled, the bran layer is stripped away as a byproduct. That bran contains roughly 15 to 20% oil by weight, which can be separated using a chemical solvent (typically hexane) or through newer methods using pressurized carbon dioxide. Hexane extraction is the industry standard because it works at normal atmospheric pressure and pulls out the most oil. Supercritical carbon dioxide extraction produces a cleaner, solvent-free product but requires high pressure and yields less oil, making it more expensive and less common commercially.
After extraction, the crude oil is refined to remove impurities, waxes, and free fatty acids. This refining step matters more than you might expect: crude rice bran oil tends to carry higher levels of heavy metals than the refined version. A USDA analysis found that some crude rice bran oils contained heavy metal concentrations well above safe drinking water thresholds, while refined oils generally tested lower. If you’re buying rice bran oil, refined is the safer choice.
Fat Composition and Nutrients
Rice bran oil has a balanced fatty acid profile. Roughly 42% of its fat is monounsaturated (mostly oleic acid, the same type dominant in olive oil), about 30 to 39% is polyunsaturated (mainly linoleic acid, an omega-6 fat), and around 19 to 25% is saturated (primarily palmitic acid). This ratio puts it between olive oil and soybean oil in terms of fat balance.
What sets rice bran oil apart from most cooking oils is its concentration of minor bioactive compounds. It contains both tocopherols and tocotrienols, two families of vitamin E. Most common cooking oils are rich in tocopherols alone, but rice bran oil delivers a meaningful amount of tocotrienols, which are less common in the diet and have shown stronger antioxidant activity in some research. The oil also contains squalene, a compound your skin naturally produces, along with plant sterols like campesterol and sitosterol that can interfere with cholesterol absorption in the gut.
Gamma-Oryzanol
The compound most unique to rice bran oil is gamma-oryzanol, a mixture of antioxidants found almost exclusively in the rice bran layer. Concentrations in the oil range from 0.2% to 2.7% depending on the rice variety, growing conditions, and how the oil was extracted. Gamma-oryzanol has demonstrated anti-inflammatory and antioxidant effects in lab studies, and it’s one of the main reasons rice bran oil is marketed as a health-forward cooking oil in Asia.
Effects on Cholesterol
A systematic review and meta-analysis of 11 randomized controlled trials found that people who consumed rice bran oil saw their LDL (“bad”) cholesterol drop by about 7 mg/dL and total cholesterol drop by roughly 13 mg/dL compared to control groups. Those are modest but real reductions. HDL (“good”) cholesterol increased significantly in men, by about 6.7 mg/dL, though the effect wasn’t as clear in women. The oil didn’t meaningfully change triglycerides or other blood lipid markers.
These cholesterol-lowering effects likely come from the combined action of gamma-oryzanol, plant sterols, and the oil’s unsaturated fat content rather than any single ingredient. The reductions are comparable to what you’d expect from switching to other heart-healthy oils, though the gamma-oryzanol content gives rice bran oil a slight edge in some comparisons.
Cooking With Rice Bran Oil
Refined rice bran oil has a smoke point around 232°C (450°F), which is high enough for deep frying, stir-frying, and sautéing. For context, that’s roughly on par with refined peanut oil and slightly below safflower oil (265°C) and refined avocado oil (271°C). It won’t break down and turn acrid at typical frying temperatures, which is why it’s a staple in commercial kitchens and snack food production across Asia.
The flavor is mild and slightly sweet, with subtle nutty and earthy notes. Sensory studies describe it as having a “rounded aroma” that doesn’t overpower food. The flavor fades quickly rather than lingering, which makes it a good neutral-base oil for dishes where you want the ingredients to be the star. It works well for frying, baking, salad dressings, and even as a margarine or shortening base. Its light mouthfeel won’t leave food feeling greasy the way some heavier oils can.
One practical advantage: rice bran oil has a long fry life, meaning it can be used for multiple frying sessions before it degrades. This is partly due to its antioxidant content, which slows the oxidation that makes cooking oils go rancid or develop off-flavors.
Skin and Cosmetic Uses
Rice bran oil shows up in moisturizers, serums, and anti-aging products, and for good reason. It contains squalene, a lipid that closely mimics the oils your skin already produces, which helps it absorb without feeling heavy. The oil’s phenolic compounds and vitamin E isomers contribute anti-inflammatory and photoprotective properties, meaning they help calm irritation and offer some defense against UV-related skin damage. Rice-derived ingredients in general have shown moisturizing, skin-brightening, and anti-aging effects in dermatological research.
As a standalone oil applied to skin, rice bran oil is lightweight enough for most skin types. It’s commonly used as a carrier oil for essential oils or as a facial oil for people who find heavier options like coconut oil too pore-clogging.
Potential Concerns
The main concern with rice bran oil is heavy metal contamination, particularly arsenic. Rice plants absorb arsenic from soil and water more readily than most crops, and that arsenic concentrates in the bran layer. USDA research confirmed that some rice bran oils, especially unrefined versions, contain arsenic, lead, cadmium, and mercury at levels worth paying attention to. Refining reduces but doesn’t always eliminate these contaminants. Choosing refined rice bran oil from a reputable brand that tests for heavy metals is the most practical way to minimize exposure.
The oil is also relatively high in omega-6 fatty acids compared to omega-3s. If your diet already skews heavily toward omega-6 sources (most Western diets do), adding large quantities of rice bran oil could widen that imbalance. Used as one oil among several in your cooking rotation, this isn’t a significant issue.