PEG stands for polyethylene glycol; PPG stands for polypropylene glycol.
References for this information:
Toxicological Research, June 2015, pages 105–136
International Journal of Pharmaceutics, July 2005, pages 367–371
Journal of Colloid and Interface Science, March 2008, pages 316–321
About the Experts
Paula Begoun is the best-selling author of 20 books about skincare and makeup. She is known worldwide as The Cosmetics Cop and creator of Paula’s Choice Skincare. Paula’s expertise has led to hundreds of appearances on national and international radio, print, and television including:
The Paula's Choice Research Team is dedicated to busting beauty myths and providing expert advice that solves your skincare frustrations so you can have the best skin of your life!