http://orbisvitae.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=59046#Post59046

Alpha lipoic acid flushes out deeply stored mercury, such as in the brain, nervous system and vital organs. It is a good idea to start DMSA a few months before starting ALA to get some mercury out of the body that is not so deeply stored, enabling mercury to later come out of the brain and nervous system when ALA is added.

A few companies make ALA in 50 mg tablets or capsules. Country Life, Source Naturals, and the Vitamin Shoppe brand are three I can think of. Kirkman might be the only source for 25 mg ALA tablets. Tablets and capsules of ALA 100 mg or larger are easy to find.