These are the ones you should stop for sure
Chlorella, Cilantro, AlphaLipoicAcid, Chelorex, Bio Chelat, NAC, GLutatione. NAC may be ok to take, but it can make many people worse, it depends on how sensitive your brother is to sulfur. ITs best to stop it, and maybe try it at a later time and see how he reacts to it.

The basic theory of Andy Cutlers Chelation protocol is this. When you take anything that chelates mercury (Cilantro, AlphaLipoic Acid, DMSA, DMPS) it picks up a lot of mercury from the body, some of the mercury is excreted, and the rest settles back into the body in a new place, causing damage. The only way to avoid this problem is to keep a steady supply of chelating agent in the blood, by dosing it frequently. For DMSA that is every four hours, for DMPS it is 8 hours, for ALA it is 3 hours. The time is unknown for cilantro. Chlorella does not chelate mercury. When you take a chelating agent frequently enough, the mercury will not settle back into your body. When the mercury settles back in the body it is called redistribtion, and can make a person severely worse over time.

I am not sure about OSR, but it would probably be safest taken according to this theory, meaning smaller more frequent doses to keep a steady supply of OSR in the blood, as no chelating angent will excrete all of the mercury it picks up. Redistribution is a real danger when chelating mercury.