The best source of low doses of ALA is Kirkman and the best source of low dose DMSA is Vitamin Research Products(vrp.com). That is where most people get their ALA and DMSA from that use Andys protocol.
In terms of supplements the basic ones Andy suggests are vitamins C, E, Zinc, Magnesium and Omega 3's(fish or flax oil). You should consider ordering his book, or checking out this link for more info:
I would suggest getting your DMSA from VRP in 25mg capsules and the ALA doesn't matter as much, but Kirkman sells 25mg capsules as well so that is the most convenient.
check out the links I gave you for more info. You should consider joining the FDC yahoo group.