Canola oil is one of the oldest known vegetable oils. There are both edible and industrial forms produced from rapeseed, the seed of several cultivars of the plant family Brassicaceae. Historically, it was restricted as a food oil due to its content of erucic acid, which in laboratory studies was shown to be damaging to the cardiac muscle of laboratory animals in high quantities and which imparts a bitter taste, and glucosinolates, which made it less nutritious in animal feed.
Canola is extensively cultivated in Canada, France, Belgium, Ireland, the United Kingdom, the United States, the Netherlands, Germany, Denmark, and Poland. In France and Denmark, especially, the extraction of the oil is an important industry.
Canola oil is a food-grade version developed in Canada (hence the name, see below) derived from rapeseed cultivars specifically bred for low erucic acid content. Also known as low erucic acid rapeseed (LEAR) oil, it has been generally recognized as safe by the United States Food and Drug Administration