After seeing a name brand supplement company marketing 10g "Glycerol (as Glycerol Monostearate)" powder for use in 14oz water and reading https://pubmed.ncbi.nlm.nih.gov/20092365/ I decided to try it, believing it mixes with water. Stirring, shaking, letting sit; the powder just floats, making it impossible to slowly ingest over 60 minutes as recommended by the researchers in that linked peer reviewed article . Wikipedia search https://en.wikipedia.org/wiki/Glycerol_monostearate reveals that Glycerol Monostearate is insoluble in water! No amount of stirring or blending will ever dissolve it. Going back to the full published guideline article (not just the free abstract) and I see that 'monostearate' and 'GMS' are never mentioned.
In my opinion, insoluble GMS powder is not a good source of glycerol, again, in my opinion. I would rather deal with weighing out the liquid stuff and being able to follow the recommended intake protocol than mess with insoluble powders.
TLDR: 1 star review to warn others that GMS powder doesn't mix with water. Food grade pure glycerol in liquid form, which is miscible in water, is available.
The service and packaging from Bulk Supplements was great.