Clear, colorless liquid used in cosmetics to adjust a product’s pH. Ammonium hydroxide is synthetic and sometimes used instead of sodium hydroxide to maintain an acidic pH in AHA (alpha hydroxy acid) or similar exfoliant products. The small amounts used in cosmetics are not considered sensitizing on skin.
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!