This article analyzes the composition of oils and identifies harmful substances. One of the most common methods of food detection, the most common method today, is high-liquid chromatography. The generality of this method is that it can analyze the tracking of any food and other products. The only downside is that it can be standardized. The principle of operation of the method is that the product sample must be dissolved in the extract and placed in a liquid state. This method can also be used to determine the carbohydrates, proteins, fats, preservatives, vitamins and emulsifiers in food. Toxic substances in food can also be identified, mainly from the chromatographic analysis of cottonseed oil.