I was wrongly chelated unknowingly by a doctor using ALA while I had fillings in. I became very sick and thought I would die. Following removal of my fillings, I used the Cutler protocol, 25 mg of DMSA every 4 hours for three days a month. I am much better.
The Cutler protocol is the best one to use, but it is not all inclusive. In addition to it, do organ support and cleansing as on this site. DMSA made my yeast really bad and I found enemas and Liver Flushes helped alot with those symptoms. My best advice is to go slowly and cautiously with minimal doses until you see how you react. Slow and steady is better than trying to get it done quickly.