I get my supplements from http://www.livingnetwork.co.za/ - they do custom doses.

I take ALA and DMSA. I started off with 12.5mg's of DMSA, gradually moving up to 25mgs after 10 rounds. I introduced ALA on the 12th round, at 12.5mg dose. I tolerated it fine and I'm now on 50mgs of ALA. I would reccomend to start low though - perhaps 12.5mg and then move up gradually (never increase your dose on the same round).

I have a blog documenting my detox of mercury, any questions you have will already be covered on there: http://rejectmercury.blogspot.com