Andrew Cutler's book is used all over the world. If his comments were unsupported and guess work, he'd have been found out long ago. Fully qualified doctors are reading it and more of them are using it to help patients.

My own doctor read his book and then photocopied much of it. She was impressed. He also helps autistic kids around the world a LOT of mercury toxic adults. I think he has some idea of what he speaks.