I dont know what is in those bottles that is giving a positive reading, but its not hcg. Homeopathic hcg doesn't usually return a positive on pregnancy tests because there isn't enough hcg. I imagine that any of those drops will work because you are still only eating 500 calories a day. The question is, what will it do to your body when you get off the VLC. I have never had an issue stabilizing after hcg. I would be scared to death to go off the diet with the fake drops.