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Rating Ingredient
Good

xanthan gum

Used as a thickening agent.

Best

xanthophyll

Also known as lutein, this is a cartenoid pigment from plants that functions as an antioxidant.

Good

Ximenia americana oil

Latin name for plum oil; it can have emollient properties.

Poor

Xi xin

Good

xylitol

Good

xylose

Form of sugar. Similar to other sugars, xylose has hydrating properties for skin.

Categories: Miscellaneous, Hydration
Good

xymenynic acid

Synthetic fatty acid that functions as a skin-softening agent.

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!