ALA can cause candida to flare up. Is he taking any antifungals? Imo a potent olive leaf extract is good to take. So is molybdenum(500 mcg or 1,000 mcg a day). Make sure he drinks enough water.
taking DMSA together with ALA usually produces much less severe side effects than taking ALA alone. He should make sure that he eats enough fiber, as almost all the mercury removed by ALA goes through the bowel.

Is his diet good? Is he getting enough iron and copper? Does he get plenty of sunlight? If not, then perhaps he needs a vitamin D supplement? I take 2,000 units a day of vitamin D. Taking a carnitine supplement might help his energy level. Using a vitamin B12 nasal gel might also be helpful.

I have stopped using ALA and DMSA for now and am on a high dosage iodine(48 mg a day) regimen.

www.iodine4health.com