6th round of ALA chelation, no improvment, throw in the towel?

[Guest guest]

We just finished our 6th round of ALA chelation on my 13 yo non-verbal

son and there have been no improvements in his autistic symptoms. I

figure I would have seen some improvement by now if we were going to

see any. He tolerates the ALA well and seem a little mellower while on

but that's it. I am considering the 6th round his last. Is it too

soon to throw in the towel?