To know for sure, you'd have to call the maker and ask them directly.
As a general rule, if it does not say USP in the name of the product, its iffy at best.
I have some for trade that was made by Proctor and Gamble, it specificaly says USP in the name, and came with a lab reports on it. On the first page, at the top it says Superol V (for veg) Glycerine USP (Glycerol), 99.7% pure (0.3%water).
Not all glycerine is veg, some is kosher, and some is non kosher, (I'm not of a Jewish background, but if I remember right, that would mean that there is animal products included. But don't quote me, I don't want to be sued. LOL)
I was not able to find pure VG that I trusted localy, I was able to finaly find USP PG at a local pharmacy, (if you need it, look for a "compounding pharmacy".
Both MidWest Vapor and DIY Flavor Shack sell it, as do many others I'm sure, or I have some available for trade.
Hope that helps.