Hi, I used a few different potencies prescribed by a Classical Homeopath (a Homeopath who is fully trained and follows traditional homeopathy -- and does not follow the new, very different styles of homeopathy which are becoming popular these days).
Apparently Nat Sulph is a "deep-acting remedy". It's not a remedy that should be used freely. Some of the other remedies can be used freely, but not this one. It needs to be taken in a certain way.
Nat Sulph might not be the right remedy for any other patient. A full consultation is needed. Just taking any old remedy, willy-nilly, will not necessarily give best results.
I can only relate my own experience. My advice to anybody wishing to try homeopathic remedies, for any type of brain injury or disorder, is to seek the guidance of a very experienced Classical Homeopath (traditional homeopath).
PLUS there are homeopathic remedies that reverse the effects of drugs/medications. If autism has resulted after taking some sort of medications, that MIGHT be a solution.
I once took the wrong homeopathic remedy by mistake, and felt a bit ill. I then took the remedy the Homeopath had given me, that reverses drugs/medications/remedies. Within a few minutes I felt better.
AS FAR AS I AM AWARE only a highly-trained and experienced Classical Homeopath can provide the correct prescription. I would be wary of just taking any remedy you hear about, hoping it might work.
The remedy has to be matched to the person/the symptoms. A remedy that works for one person might not work for another.
Good luck, I hope you find some very good treatments.