I purchased some from the pharmacy. They sell it as a laxative.
It was mixed it with water prior to exercise as per some of the articles on the Interwebz in an attempt to find something to help with the Georgia heat. My experience was similar to those of Kevin Ash in post number 6 at
UltRunR - Glycerol / Glycerine. Maybe you will have different results.
Was it
HydroMax?
The post linked above mentions a product named Glycerate HydroOptimizer. I cannot find it online.
-Tim-