Rapeseed oil (also known as canola oil in its low-erucic-acid form) is a widely used vegetable oil extracted from the seeds of the rapeseed plant, Brassica napus, a member of the Brassicaceae (mustard/cabbage) family. The plant is closely related to cabbage, broccoli, cauliflower, and mustard.
Rapeseed has been cultivated in Europe and Asia for centuries, with evidence of its use dating back to ancient Indian and Chinese civilisations around 2000 BCE. The name "rapeseed" derives from the Latin word rapum, meaning turnip, reflecting its botanical relationship to root vegetables in the Brassica genus.
The largest producers of rapeseed oil include Canada, the European Union (particularly Germany, France, Poland, and the United Kingdom), China, India, and Australia. Global annual production of rapeseed oil exceeds 27 million metric tonnes, making it the third most produced vegetable oil in the world after palm oil and soybean oil. Rapeseed thrives in temperate climates with cool growing seasons and moderate rainfall.
The production of rapeseed oil begins with the harvesting of mature rapeseed pods, which contain small, dark seeds with an oil content of approximately 40-44% — one of the highest among oilseed crops. After cleaning and conditioning, the seeds are mechanically pressed (expeller pressing) and then typically subjected to solvent extraction to maximise oil yield. The resulting crude rapeseed oil is refined through degumming, neutralisation, bleaching, and deodorisation to produce a pale yellow, mild-flavoured oil suitable for food manufacturing and cooking.
A pivotal moment in rapeseed oil history occurred in the 1970s when Canadian plant breeders developed low-erucic-acid, low-glucosinolate rapeseed varieties — branded as "canola" (Canadian Oil, Low Acid). Traditional rapeseed oil contained 30-60% erucic acid. Canola varieties contain less than 2% erucic acid and have become the dominant rapeseed type in global food markets.
The fatty acid profile of canola/rapeseed oil is considered one of the most nutritionally balanced among vegetable oils: approximately 60-65% oleic acid (omega-9), 18-21% linoleic acid (omega-6), 9-11% alpha-linolenic acid (omega-3). The low saturated fat content (approximately 7%) is the lowest of any common cooking oil.
Historically, rapeseed oil was primarily used for lamp oil, lubricants, and industrial applications in Europe. In India and China, mustard and rapeseed oils have been used in cooking for thousands of years. During World War II, rapeseed oil was used as a marine engine lubricant, and the interruption of Asian supplies during the war led Canada to dramatically expand rapeseed cultivation. The post-war development of canola varieties transformed rapeseed from an industrial crop into a premium food oil.
In the food industry, rapeseed/canola oil is one of the most popular cooking and frying oils worldwide, valued for its neutral flavour, high smoke point (approximately 230 degrees Celsius for refined grades), excellent nutritional profile, and competitive pricing. It is widely used in commercial frying, salad dressings, mayonnaise, margarine, baked goods, and as a general-purpose food manufacturing oil. Cold-pressed rapeseed oil, which retains its natural golden colour and slightly nutty flavour, has become a premium product in European artisan food markets.
Rapeseed oil has significant industrial applications. It is the primary feedstock for biodiesel production in Europe, with rapeseed methyl ester (RME) meeting EN 14214 specifications. The European Union's renewable energy directives have driven massive expansion of rapeseed cultivation for biodiesel. Rapeseed oil is also used in bio-lubricants, hydraulic fluids, metalworking fluids, and as a base stock for environmentally sensitive lubrication applications where biodegradability is required.
Food-grade improvements include the development of high oleic rapeseed/canola varieties (HOLL — High Oleic, Low Linolenic) with improved frying stability, non-GMO identity-preserved supply chains, organic production systems, and cold-pressing techniques that preserve natural antioxidants and flavour compounds.
Interesting facts about rapeseed include: rapeseed flowers produce brilliant yellow fields that are an iconic sight across the English, French, and German countryside in spring; rapeseed honey is one of the earliest honey varieties harvested each year; the rapeseed plant is an excellent rotation crop that suppresses soil-borne diseases and improves soil structure; and rapeseed meal (the protein-rich residue after oil extraction) contains approximately 36-40% protein and is a valuable livestock feed ingredient.