[noun] Retinol is a vitamin A derivative with incomparable anti-ageing properties. Over the years, it has been one of the most studied and proven substances in cosmetology and is known to be one of the most demonstrably effective active ingredients available.
First available, by prescription only, in the 1960s to treat acne, this molecule reached its popularity peak in the 1990s with the discovery of its exceptional anti-ageing properties. But the superstar molecule was found to be unstable and sometimes irritating if used inappropriately and fell out of favour in the 2000s. Today, retinol-based skincare is making a strong comeback, as the active ingredient is stabilised and optimised for the greatest effectiveness and tolerance possible.