It's all conceptual design. If oil had entered human cells, human skin would have rotted. Generally, the so-called fat burning product is to add raw materials to the formula to stimulate skin fever, which will accelerate blood flow and cause local immune response. Immune factors will drive a small part of fat metabolism in the process of protection, and a slight change will become a miracle in the exaggerated propaganda of body stylists. In fact, the effect is not great and it is not recommended.