I have been taking the creatine for four days now. The reason for the xxtra clean (my friend gave me) is that he claims that it worked for him. He claims that he was smoking up two days prior to his test and he passed. I tried at that time to get him to inquire here as I was/is under the impression that they are just ripping you off. If I was given this not sure if it could harm if I took it as well as dilution.