I would give a +1 to cbd as well. I honestly don't think it could hurt. My stutter was definitely on the severe side when I was younger. It was very frustrating.. Sometimes around 1996 my parents were able to send to a month long intensive speech therapy clinic. It was infinitely valuable. I didn't feel alone, learned a lot of great skills and techniques - it made a big difference. I won't use specific numbers but I knew what a financial strain this was for my parents to be able to send me. The 1 month clinic was 5.5 times the cost of my parents monthly mortgage. We weren't "poor" but things were often tight. And I knew it.... They did not just have this money laying around... My fluency was better but not perfect, I often had a bad view of myself when I couldn't be fluent. "What's wrong with me?" I could communicate better but I still stuttered and for me that wasn't ok. I'm much older now and I now see that: communication > fluency and your son might not see that. You've clearly put a lot of support behind him but the FACT is - he may never be fluent no matter how much therapy and practice he has - he'll still have bad days. I hate idea of "stuttering freely". Why would I want to do that - I want to speak fluently. I've had to become more ok with who I am and the way that I communicate with others because - I have no choice. Finding acceptance with myself and the way I talk has been very empowering. Ironically being more ok with my speech impediment has empowered me to be more confident - and stutter less. Remind your son who he is, strengths and qualities. The way he talks doesn't define him.