According to Brandt, by micro-encapsulating retinols — that is, surrounding them with a film that keeps them separate from other ingredients so that they don't break down until they are applied to the skin — it allows you to use them on sensitive areas like the chest, neck, stretch marks, acne scars, and even your eyes. There have been advances in the speed at which retinols can work, too: Neutrogena's Rapid Wrinkle Repair line uses an accelerated Retinol SA, which promises immediate results thanks to an infusion of glucose and hyaluronic acid. "The Retinol SA is sustained action and it works continuously," says Dr. Debra Jaliman, a dermatologist and author of
Skin Rules: Trade Secrets from a Top New York Dermatologist. "Because of the glucose complex, it also penetrates the skin better, so it is more effective – you see results in one week."
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