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Why should cosmetics ingredients be stable?

Dr. Ellen Marmur, MD
Dermatology

It is common for a chemical to become unstable when exposed to light or oxygen in air and thereby lose its effectiveness. Vitamin C, a strong antioxidant, is notoriously difficult to keep stable in its topical form. Once it is exposed to oxygen, it's deactivated and may even become irritating to the skin. The chemist's challenge is to make sure the active ingredient remains stable and effective both inside a product's container and out. An ingredient can also become ineffective simply by being applied it the wrong way. Again using vitamin C as an example, if it is applied to damp skin it becomes destabilized and inactivated.

Simple Skin Beauty: Every Woman's Guide to a Lifetime of Healthy, Gorgeous Skin

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Simple Skin Beauty: Every Woman's Guide to a Lifetime of Healthy, Gorgeous Skin

What if a leading dermatologist just happened to be your best friend and you could ask her anything? DR. ELLEN MARMUR, a world-renowned New York City dermatologist, answers all your questions with...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.