The process of refining oil removes peanut protein, which is responsible for triggering an allergic reaction. Peanut oil (sometimes labelled as Arachis or Groundnut oil) is commonly used as a component in vegetable oil, as a carrier in processed foods or as an emulsifier/lubricant in cosmetics. Studies have shown no detectable protein in refined peanut oil, and no reaction among peanut allergy sufferers to the refined oil. However, unrefined or crude oils or oil that has been used to cook peanuts do contain protein and should therefore be avoided.