The invention relates to a method for the solvent free fractionation of shelled and comminuted jatropha seeds that have a phorbol ester content. At least the following fractions are obtained: a shred fraction the phorbol ester content of which is reduced relative to the phorbol ester content of the jatropha seeds and an oil that contains phorbol ester. The method has at least the following method steps: adding water and acid to the comminuted jatropha seeds thereby forming a suspension that contains oil the pH value of the suspension being set to <= 3.5 separating crude oil from the suspension that contains oil preferably in the centrifugal field in order to form the crude oil fraction and the shred fraction adding oil that is free of a phorbol ester content or at least has a reduced phorbol ester content in particular vegetable oil to the shred fraction and separating extraction oil from the shred fraction from step 400) preferably in the centrifugal field.
