Propylene Glycol (PG) Vegetable Glycerin ( VG) Polyethylene Glycol (PEG)

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  1. M & M

    M & M Super Member ECF Veteran

    Dec 12, 2009
    Central U. S. A.
    Propylene Glycol (PG), Vegetable Glycerin ( VG), and Polyethylene Glycol (PEG)

    All three are water soluble viscous liquids used in e-cig liquids to deliver nicotine and/or flavors.
    Produces the vapor and provides a similar sensation to inhaling tobacco smoke.
    They are humectants (attract moisture) and may dry your throat and cause it to feel sore. Drinking more fluids will help.
    Some people experience allergy-type symptoms to one or all three.
    If so, stop using and/or switch to one of the other two and see if the symptoms go away. If severe, it is recommended that you see your doctor.

    Propylene Glycol (PG)
    Propylene glycol - Wikipedia, the free encyclopedia
    Most commonly used, more throat hit, more flavor.
    Slightly sweet and colorless.
    USP approved propylene glycol is used in cosmetics, toiletries, food colorings, cake mixes, salad dressings, soft drinks and more.
    It is also used in the smoke / fog machines found in theatres and nightclubs.

    Vegetable Glycerin ( VG)
    Glycerol - Wikipedia, the free encyclopedia
    Slightly thicker and sweeter.
    Produces more vapor.
    USP approved glycerin is used in 1500+ applications as an additive to food and drink.
    Glycerin can be found in the baking or craft areas in grocery, hobby and department stores. It can also can be found in pharmacies.
    Also known as: Glycerin, Glycerine, or Glycerol.
    Pharmaceutical grade glycerin is named Glycerin, USP. Without this exact nomenclature it is not pharmaceutical grade (any variation indicates that it is not regulated, and therefore uncontrolled). In the UK it is termed Glycerine, BP.

    In the United States it is recommended that you only use USP approved propylene glycol and glycerin.
    If you live outside of the U.S., use only pharmaceutical approved Glycerin and/or PG.

    Polyethylene glycol (PEG)
    A non-toxic compound that is used in pharmaceutical compositions and food additives.
    PEG 400 - Wikipedia, the free encyclopedia


    Air Sanitizers
    Air Sanitizers | Pesticides | US EPA

    PG and glycerin have also been studied for inhalation safety due to their common use on stages around the world for fake smoke/fog machines.

    Medicine: Air Germicide
    Medicine: Air Germicide - TIME

    EPA PG reregistration approval document:

    The other Esta group test report:

    The NIH final report on PG:

    The FDA Inactive ingredients database (insert propylene glycol in the search box for a list of FDA approved drugs that contain PG):
    Inactive Ingredients in FDA Approved Drugs

    The study that showed PG safe as a base for inhaled cyclosporine by lung transplant patients:
    Mary Ann Liebert, Inc. - Journal of Aerosol Medicine - 20(4):417

    Propylene Glycol Toxity

    A post with several links to PG research

    PG used as the disinfectant in the air conditioning systems (and air) of large buildings:

    Discussion Thread:

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