The requirements for harmful impurities in the production process of industrial gelatin are not high, and the control of raw materials and production processes is not as strict as that of food or medicine, especially the leftovers in leather processing, which may contain more toxic substances after being treated with some toxic reagents.
The most common harmful substances of industrial gelatin are heavy metals, especially hexavalent chromium, which is more harmful. In addition, due to problems in the production process, it may also contain heavy metals such as lead, mercury and cadmium, which will increase the risk of cancer if eaten by people.