It is indeed hard for workers to pinch the skin, but their hands are not directly inserted into the soy milk. As someone who has been dealing with the yuba industry for many years, I can tell you responsibly that there are not many yuba factories now. Chemicals will be added, usually some food additives. Our factory uses the Douyuan brand, which complies with national standards and is harmless to the human body and does not contain any contraband. There is no such thing as allergies.