Perhaps systemic Candida Overgrowth can be reduced, or even "cured", but candida itself is found in almost everyone's digestive tract as part of a healthy ecosystem. In fact, many have suggested that it increases in the gut to protect us from heavy metal issues, but that's somewhat controversial.
Nevertheless, it's only when it spreads and becomes systemic that it becomes a problem. What's a little different about this guy's protocol is that he mentions candida infestation of the liver...something that most books or studies never talk about.
Still...$300 is too much. He'd be better off selling the DVD's with all the info and letting people buy there own herbs.