Sounds like it's primarily successful for the person selling it. These gimmicks don't usually work long term. Sometimes people say they work because they need to justify the amount of money they have shelled out. I believe you also tried a type of electrode technique about a year ago perhaps - but that hasn't brought your child or the rest of the family the level of relief you need either.
There are both external and internal things that can be done for a defiant child (or one with attention issues, rage, violence, etc.) - there are behavioral techniques, guided by a professional who can keep both parents totally on track. There are medications - not everyone wants to go that route because it's just treating symptoms and not getting at the cause, and there is the expense, and there are side effects. Then there is the internal method which gets to the epigenetic reasons for these problems, the improper switching on and off of genes that can create all kinds of physical and behavioral problem. With advances in epigenetics and a dietary ingredient that can influence gene expression (turn on the good gene as it's supposed to be and turn off the bad genes), the cells in any part of the body can be restored to their proper functioning. This can lead to better health in many ways including chemical issues that result in negative behaviors, attention issues, rage, and so on.
I think grasping at straws with no assurance of success other than the ads for an expensive program is probably going to be very frustrating for you. You've been dealing with this for a long time and my heart goes out to this poor child whose body is betraying him.