It's safe to make your own soy milk. I don't know what is in soybean milk powder, and the hygiene of freshly ground soybean milk can't be guaranteed. Some "black-hearted" businesses add additives to bean materials without you seeing them. Homemade soybean milk is hygienic, without additives, and can be matched with bean materials according to your own tastes and hobbies. Home soymilk machine is very convenient, so it is better to make your own soymilk.