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Natural rapeseed oil contains erucic acid, which is mildly toxic to humans in large doses but is used as a Food Additive in smaller doses. Canola is one of many selected cultivars of rapeseed bred to have a low erucic acid content. Canola was developed in Canada and its name is a contraction of "Canadian oil, low acid". The name was also chosen partly for marketing reasons, so successfully that the name is sometimes mis-applied to other cultivars of rapeseed.