as you know my wife took DCA for 6 Days and then stopped taking it.
It will be very difficult that she can take it anymore due to less energy, mental and physical. We don't think that here constitution is due to the use of DCA, rather it is the advanced cancer blocking her lymph nodes. At my wifes situation it's very difficult to restart taking DCA.

She is still hoping although the physician are not!
Nevertheless we will post our experience as long we can.

I hope I can help with some details:

The source of sodium DCA:
http://www.sigmaaldrich.com/catalog/search/ProductDetail/ALDRICH/347795

Sigma provides a sodium salt. After disolving in water a lightly acid solution of pH 5 results.

The dose we used (25 mg/kg/day) was described in lactacidose treatment in children up to 19 years. (http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=16651305)

More about clinical toxicology of DCA you will find here:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=9703483