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Refined peanut oil is generally considered safe for most peanut allergic persons. This is thought to be due to the fact that most, if not all, of the protein is removed during the extraction process. There have been studies into whether reactions occur in peanut-sensitized individuals with exposure to refined peanut oil versus crude peanut oil. Those who participated in one study did not have a reaction to refined peanut oil and 10% had a reaction to crude peanut oil. Other studies are conflicting, showing that a small number of peanut allergic individuals may have a reaction to refined oils.
It is not currently clear whether there is protein if any in refined oils and whether this minute amount could cause an allergic person to react, but in general, most peanut allergic persons do tolerate refined peanut oil. What we do know is that the protein content of these refined oils is consistently about one hundredfold lower then crude or cold pressed peanut oil (100-300 micrograms). Consumption of crude or cold pressed oils would not be recommended, due to the protein content in these oils.