It posts fast and their are some very experienced people here that chelate. I hope they respond too.
The ALA is given in tiny doses such as 12.5 mg. because of your fear. I'm not sure if it will actually bind in the brain somewhere else, or just cause damage on its way out. But I think the more you read on it, the better you will feel about chelation. Everyone recommends small doses. Less is more. The more you read other parents experiences, the better you will feel. I haven't read any horror stories. I have read where children react regressively when the ALA is added because the mercury is getting stirred up. But after, these same people report a rainbow of positives.
I was nervous about chelation too. But I look forward to it every weekend now. Good luck!! And please keep us posted. I love to read other experiences.