Palm oil comes from the crushed fruit of the oil palm tree. Once the fruit is crushed, the kernels (or stones) from the fruit that are left can be further crushed to yield another oil, palm kernel oil (PKO). As such, some people consider the PKO as a by-product of palm oil production. Recovering the PKO from the kernels increases the productivity of oil palm plantations. While palm oil is used as a food ingredient, the chain length of the oils in PKO make it an ideal raw material for producing surfactants used in detergents and other products. As palm oil and PKO come from the same fruit on the same tree, their environmental profiles in the growing stage are similar.