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Rating Ingredient
Average

quaternium-15

Formaldehyde-releasing preservative used in cosmetics. It can be a skin sensitizer, as can all...

Categories: Preservatives
Good

quaternium-18 hectorite

Used as a suspending agent and also has emulsifying properties.

Categories: Texture Enhancer
Good

quaternium ammonium compounds

A wide range of ingredients, called “quats” for short, that share a unique molecular structure that...

Categories: Uncategorized
Best

quercetin

A bioflavonoid ingredient from plants. Quercetin occurs naturally in red wine, tea, onions, kale, tomatoes, berries, and many other fruits and vegetables...

Poor

quercus

Categories: Plant Extracts
Poor

Quercus infectoria extract

Categories: Plant Extracts
Good

quillaja extract

Extract of the Chilean soap bark tree. It contains a good amount of saponins, which have cleansing,...

Categories: Plant Extracts
Poor

quince seed

Used as a thickening agent in cosmetics, but also has skin-constricting properties...

Good

quinoa oil

Derived from quinoa grain, it may have disinfectant properties (Source: Journal of Agricultural Food...

Categories: Plant Extracts, Emollients

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:

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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!