Oryzanol is a natural compound found in rice bran oil that has antioxidant and anti-inflammatory properties. However, like many natural compounds, oryzanol can contain impurities that may affect its overall purity and effectiveness. These impurities can include residual solvents, heavy metals, and other contaminants that may be harmful to human health. Therefore, it is important to ensure that oryzanol products are properly purified and tested for impurities before use.