IP6 does not bind completely to Hg so best to use it right after you take your other chelators.
Best to take 2gm per day for 5 days to clear the rust. I would also take NAC with the ALA to make sure the IP6 targets rust.
The main issue is quality of IP6, in its raw form digestibility becomes an issue and with a lot of companies the ratio of IP6 to Inositol is prohibitive.