Dissolving 10g ascorbic acid in 180ml glycerol far exceeds the solublity 1g/100ml found by searching 'ascorbic acid solubility glycerol'.
It appears that 10g/180ml is a supersaturated solution ,that some kind of complex is formed,or that 1g/100ml is not correct.
The figure Alan gives is widely cited and appears to be correct. Maybe you are forming another mystery ester!
I have found that propylene glycol can be formed by heating glycerol to 302 F in the presence of a catalyst, which may be either an ion exchange resin or a small amount of sulfuric acid. In the process of heating Metol in glycerol, the sulfuric acid attached to the Metol was detached and served as a catalyst, and what I may have is Metol base in propylene glycol. As to what becomes of the sulfuric acid, perhaps it winds up as a sulfate of either the glycerol or the propylene glycol. Comments please.
PS: I have dissolved quite a lot of ascorbic acid in propylene glycol, in PC-Glycol. It appears the mystery may have departed from my ester. Shucks.
I don't think I could have gotten the same result starting with the glycol unless, perhaps, I had heated the mixture more than I usually do. Now I'm out of glycerol and glycol. I was wrong when I said I could get gycerol at any drugstore. The local Rite Aid drug store didn't have any and the clerks didn't even know it existed. Their pharmacy may have it but is closed on Sundays. If your local store has Leader brand, there's a good chance they will have the glycerol. I'd have to go more than 50 miles to try walmart, etc.
I bet your local druggist has some glycerine suppositories you could use. Just engineer a way to remove the impurities and you're set!
There are lots of places like The Chemistry Store who can supply it. Look for soap making supplies. Then you can also make a soap to clean up after the suppositories.