ADDitude published an opinion piece about the efficacy of neurofeedback that is worth reading (click here).

One thing that the article does not point out is that studying neurofeedback and ADHD is complicated by the fact that there is no single electrical signature in the brain that can be used to diagnose ADHD.  Some with focus and attention problems have a slow left pre-frontal cortex of the sort that stimulant medication can help, and some with focus and attention problems do not have an especially slow pre-frontal cortex. This lack of correspondence between electrical brainwave patterns and specific diagnoses is one reason why brain training with the expectation of treating or curing a mental health diagnosis often undermines the reputation of neurofeedback.   It also complicates the process of creating proper methodologies for studying neurofeedback.

For more information and a sampling of peer-reviewed literature on neurofeedback, check out the resources tab of this website at https://brainshapeva.com/resources.