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.
You Have to Be an Educated Crafter
It is up to each manufacturer of personal care products, and consumer of the same, to make up their own mind. If you are using a fragrance oil, melt and pour soap base, or pre-made liquid soap or shower gel, chances are, there is propylene glycol in it. You need to understand the ingredients in your products and make an educated choice.
Here are some informative articles about propylene glycol:
From Tom’s of Maine, manufacturers of natural toothpastes and toiletry items
From “The Cosmetics Cop”
More PG safety information
PG and Pet Safety
Wikipedia on Propylene Glycol
So...like I said. Chances are you've been using products containing propylene glycol for years. But that doesn't necessarily make them safe. On one hand, I believe that propylene glycol is fine. On the other hand, I fully support more natural products and the overall reduction of chemicals in our households and bodies.
You need to decide for yourself.