PG is already in many items you consume everyday.
Propylene glycol (PG) is a colorless, nearly odorless, syrupy liquid that is derived from natural gas. It is used in dozens of products that you commonly use around your house. Some websites and natural product promoters argue that PG is a nasty, carcinogenic chemical that has been wrongly greenlighted by the FDA. The FDA, and others, say that their claims are completely unfounded - that PG is completely safe when used properly.
Propylene Glycol is used:
* In food – Cake mixes, salad dressings, soft drinks, popcorn, food colorings, fat-free ice cream and sour cream. It also protects food from freezing and helps as a preservative.
* In toiletries and cosmetics – Lotions, creams, some baby wipes (though not in the brand I have in my cabinet), shampoos, antiperspirants, cosmetics, lipstick, lubricants
* In other household items – Room deodorizers, cleaners, sanitizers and yes, new "non-toxic" and "safe" automotive antifreezes
* And specific to the soap making and toiletry making industry, it is also used as a carrier in fragrance oils and in many melt and pour soap bases.
Propylene Glycol in Soap, Cosmetics and Household Items - Propylene Glycol Safety, Information, Danger, Controversy