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Rating Ingredient
Good

kaolin

Naturally occurring clay mineral (silicate of aluminum) that is used in cosmetics for its absorbent...

Categories: Absorbent
Poor

Kathon CG

Categories: Preservatives, Sensitizing
Poor

kava-kava extract

Extract of the Piper methysticum plant that has soothing properties, but can...

Poor

kawa extract

Good

kelp extract

Average

Kigelia africana extract

Extract of African plant commonly known as the sausage tree. The African lore about this extract is...

Average

kiwi fruit extract

As a food, kiwi has significant antioxidant properties that may even be greater than those of...

Good

kojic acid

By-product of the fermentation process of malting rice for use in the manufacture of sake, Japanese...

Categories: Antioxidants
Good

kojic dipalmitate

A mixture of kojic acid and palmitic acid. It functions as a skin-conditioning agent and antioxidant...

Categories: Antioxidants
Average

kola nut

One of the major components of the kola nut is caffeine, which in high amounts can be a skin sensitizer...

Best

kudzu root

Source of isoflavone, genistein, and daidzein, all plant estrogens..

Best

kukui nut oil

Non-volatile oil from a plant native to Hawaii; it has emollient properties for skin (Source:...

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!