Both the VG and the PG I received both times from Bulk Apothecary...are actually Nature's Oil brand products. On the Bulk Apothecary website though...it shows a jug with a label (little hard to read since it's so small in the pic) that says Bulk Apothecary on it. However, on the Nature's Oil website, that also sells Bulk Apothecary brand...
both of the same, identical 1 gallon jugs (with the same pics shown for them) are considerably more expensive - $20.40 for 1 gallon of the VG, and $27.82 for 1 gallon of the PG. My guess is both Buk Apothecary & Nature's Oil are owned by the same parent company, with 1 catering to more craft-oriented people & the other dealing more with larger quantity bulk purchases to mostly retailers.
Anyway, I know both the VG and the PG are great, as I use them exclusively for my DIY liquids. By the way, the label on the Nature's Oil brand VG I've received both times says:
100% Pure (USP Grade-Kosher) Vegetable Glycerin. Here's a link to it on the Bulk Apothecary website:
Glycerin
Well, based on one of your posts edited info...I see you already found the page. Did you look especially at the section about the Kosher Grade VG...which is about 1/2 way down the page?
I don't know if they'll provide the info. you seek on it. You could always call and ask them about it.