Unfortunately there are no legal protein powders. Remember that stage one is only a few days and soon you will be adding new foods every 4 days if tolerating them. Losing weight is a temporary part of this. If you are a member of facebook, I'd recommend going the group " Breaking the vicious cycle". You can ask any questions and there are so many members , you will get lots of responses. You can use the search option in the group too, for much help. Good luck.