DMSA is a good chelator, but isn’t the best option if you have candidiasis.
DMSA causes neutropenia, and the last thing you want during a candida infection is low WBC.
Insted, you can use DMPS, but will need an script.
If your problem is mercury, ALA is the most important chelator. You can not chelate if you have silver fillings, and if they are removed, then you need to use DMSA or DMPS for at least 3 months before to add ALA. What I am mentioning here is the way Andy Cutler has developed a detox protocol for heavy metals. You need to chelate 3 continue days a week and take the supplements every 3 hours. Then, rest 4 days taking support supplements.