This program is not intended to treat or cure any disease or illness, including any diagnosed mental illness.
That said, anyone can benefit from increased nervous system regulation. A person needs to be well enough, and organized enough in their thinking to watch and absorb the education, and do the practices. So, someone presenting with a very extreme symptom like paranoid schizophrenia will not be able to benefit from this program, whereas someone struggling with a representation like OCD, anxiety, or depression, most likely will.
As long as one is well enough that they can show up, put in the time, and comprehend what is happening, they will likely benefit.