Ingredient Dictionary

Good

quaternium ammonium compounds

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

Categories: Miscellaneous

Average

quaternium-15

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

Categories: Irritants, Preservatives

Good

quaternium-18 hectorite

Used as a suspending agent and also has emulsifying properties. Read More »

Categories: Thickeners/Emulsifiers

Best

quercetin

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

Categories: Plant Extracts, Antioxidants

Poor

quercus

See oak root extract

Categories: Antibacterial/Anti-Acne, Irritants, Plant Extracts

Poor

Quercus infectoria extract

See oak root extract

Categories: Irritants, Plant Extracts, Antibacterial/Anti-Acne

Good

quillaja extract

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

Categories: Antibacterial/Anti-Acne, Plant Extracts

Poor

quince seed

Used as a thickening agent in cosmetics, but also has skin-constricting properties (Source:... Read More »

Categories: Plant Extracts, Thickeners/Emulsifiers, Irritants

Good

quinoa oil

Derived from quinoa grain, it may have antifungal properties (Source: Journal of Agricultural Food... Read More »

Categories: Emollients, Plant Extracts

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Paula Begoun is the best-selling author of 20 books on skin care and makeup. She is known worldwide as the Cosmetics Cop and creator of Paula's Choice. Paula's expertise has led to hundreds of appearances on national and international television including:

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The Paula's Choice Research Team is dedicated to helping you find the absolute best products for your skin, using research-based criteria to review beauty products from an honest, balanced perspective. Each member of the team was personally trained by Paula herself.

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