I think you can add ALA in the next round or two if you are having very few symptoms from the DMSA. ALA can be very helpful in addressing cognitive problems. ALA does seem to cause much more symptoms than DMSA, although the symptoms from ALA are much less if it is taken with DMSA(I originally started chelating with ALA only, but after around 5 rounds I couldn't handle the symptoms and stopped chelating until I got DMSA a few months later). Start out slow with the ALA and see how you react to it. While some might say to start with 6 mg, I think 12 and a half mg of ALA plus 25 mg of DMSA every 3 hours for 3 day rounds(2 nights) would be a good starting point. My symptoms while taking ALA do seem strange. My muscle ache and fatigue increase, however my mood and cognitive ability increases. My results might not be typical though, as I had 25 mercury fillings(almost all were at least 25 years old)and am probably much more mercury toxic than most here.