The invention relates to a process for decreasing the amount of environmental pollutants in a mixture comprising a fat or an oil, being edible or for use in 
cosmetics, the fat or oil containing the environmental pollutants, which process comprises the steps of adding a volatile 
working fluid to the mixture, where the volatile 
working fluid comprises at least one of a 
fatty acid ester, a 
fatty acid amide, a free 
fatty acid and a hydro-carbon, and subjecting the mixture with the added volatile 
working fluid to at least one stripping 
processing step, in which an amount of environmental 
pollutant pre-sent in the fat or oil, being edible or for use in 
cosmetics, is separated from the mixture together with the volatile working fluid. The present invention also relates to a volatile environmental pollutants decreasing working fluid, for use in decreasing an amount of environmental pollutants present in a fat or oil, being edible or for use in 
cosmetics. In addition, the present invention relates to a health supplement, a pharmaceutical and an 
animal feed product prepared according to the process mentioned above.