I was wondering the same thing. After much research I had decided to do the Humaworm cleanse. I emailed several questions to them and either never got a response or would get very short response after a week or two of waiting. I tried contacting by phone, also. I even tried contacting some of the distributors listed on their site and got no answer other than one who told me "they no longer did that". I became nervous and weary about trying their products by this time, so I am doing Dr. Hulda Clark's cleanses. So far, it is helping and in a short while, I feel better than I have felt in a LONG time!