The Main Source?

Oryzanol was first isolated from Rice Bran Oil and this oil remains the best natural source for the compound. Various methods for its isolation have been described in Literature. The most economically viable raw material for isolation of oryzanol is the soap stock/acid oil obtained as a by-product during chemical/alkali refining of this Oil and the other being Physically refined Rice Bran Oil as that also retains 85-90% of oryzanol content in it.