Thanks very much sol. I will read the web sites that you posted. I had heard about the protein and contamination before but continue to be amazed that practioners are still using it so often with people and I thought because of this, there was something I was missing in terms of its safety which is why I posted the question. I am concerned for two friends who have doctors that use it. What you posted was very helpful. Regarding natural immunogenics, I was told by a women who runs a health food store and attends many workshops, that immunogentics is very reliable . --------------------------------- New Yahoo! Messenger with Voice. Call regular phones from your PC and save big.