Menthone impurities are unwanted substances that can be found in products containing menthone, a naturally occurring organic compound commonly found in mint plants. These impurities can be formed during the production process or as a result of the degradation of menthone over time. The presence of these impurities can affect the purity and quality of the final product and may pose health risks to consumers. It is therefore important to monitor and control the levels of menthone impurities in products containing menthone.