Used as a propellant in cosmetic products; as nitric oxide, it can generate free-radical damage and cause cell death (Source: Mechanisms of Ageing and Development, April 2002, pages 1007–1019). Topically applied nitrogen in the amounts present in skin-care products has minimal research (and no third-party, substantiated research) establishing its benefit for skin, but it does not appear to be harmful in its pure form.

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About the Experts

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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