After seeing the information in this thread, I paniced. I had just ordered 2 gallons each PG/VG from Essential Depot on 12/18.
I realize that I am a "newbie" here, and I am not trying to step on anyone's toes, but Monday afternoon I called one of my friends (high school bud) who works in the medication safety department at USP headquarters in Rockville, MD (off of Twinbrook Pkwy for those familliar with the area) and asked him if he would be able to verify the labelling requirements that were referenced here. I also asked him to let me know if he thought that the 2 Essential Depot products were safe to use for inhalation purposes. I sent him close up photos of the labels on the Essential Depot PG and VG jugs that I had received. I also sent him the text of the 2009 post by SmokeJoe containing the labeling formats.
He called me back this morning and told me that the labelling on these two products was perfectly in line with USP requirements from the standpoint of their respective monographs. All of the USP required required information was present on both labels. I asked him if he could get me a copy of the current labelling requirements, and he said that USP sets standards for products, not labels. The USP "requirements" are that the labels contain an accurate portrayal of the product information as set in the monograph for that product. After re-reading the SmokeyJoe post, I think that maybe the labelling requirements in it came from the FDA, not USP. I don't have any friends working at the FDA, so I am not able to verify it with them.
He said that any company can slap a USP designation on a product label, and they might even get away with it for a while. He also said that USP has entire groups that do nothing but research products claiming to meet USP certification standards to ensure that they do. Companies that do this eventually get caught, and they pay heavily for doing so when they do get caught.
He could not comment on "safe for inhalation", but based on the product labelling they should both be safe for all human consumption purposes. It's a tremendous relief to know that I did not
buy the wrong stuff. Unfortunately, he "charged" me for his services, and now I have to make the trek down to Rockville to
buy him lunch. The things I do in the name of public safety. Y'all owe me for this one.
I get the feeling that this is going to cause a bit of an argument on here. My friend is not an expert in PG/VG or the inhalation thereof. Neither am I. I have no additional knowledge of the subject other than what I posted above. I am going to assume that my friend operated with my best interests in mind and made his best effort at validating the information that I sent him. I have no way to verify that he did; however, I have known him since I was 6 and I trust him completely (Except around my candy stash. He used to raid that frequently when we were kids). So, either use the PG/VG from Essential Depot, or don't. I will do so without reservation.