I just took 2 tablets of ALA,20 mg each time,with 3-4 hours break between them, 3 months after removing 2 amalgam fillings with biological dentist, but sometime before tooking the ALA I tried a bath with hydrogen peroxide and after some days I felt better due to it, I also had negative symptoms so maybe it's the combination between them. I didn't really knew that it isn't so good to take ALA when the mercury levels can be high and maybe for some reasons the mercury levels were high. Maybe I will try the DMSA but just after I'll improve other problems..