My 15 year old son, who has idiopathic SFN, tried LDN for about 5 months. He started at a very low dose and the max was 4.5mg. He unfortunately did not get any relief from LDN and discontinued it. It was made at a compounding pharmacy. Like any treatment, I’m sure someone will get good results from it and if you’re in our situation where nothing has brought him any kind of pain relief yet, it’s always worth trying if your doctor thinks it’s a good idea.