From what I've read and experienced, NAC should only be taken with DMSA. And even then, only after the Cutler method has been used long enough to assure that mercury from the body has been depleted enough to alievate chances of it going into the brain. After about 6 months of the Cutler method, I have switched to Liposomal DMSA since it slow releases over 48 hours and I only have to dose every 24 hours. I combine it with NAC. Seems to be working.
GH