An improved method for preparing squalene from a squalene-containing composition, said method comprising the steps of (a) a purification distillation carried out at a temperature T1 (b) a denaturing distillation carried out at a temperature T2 wherein steps (a) and (b) may be performed in either order T1 and T2 are sufficient to cause squalene to boil T2 > T1 and T2 > 200°C.