5 things you need to know about retinol, including strengths and side-effects

Often referred to as a ‘skin active’, celebrities such as Nicole Kidman, Paris Hilton, and Jennifer Lopez have lauded retinol's benefits

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Retinol is a powerhouse beauty ingredient — but it’s a tricky one too. Here, Professor Caitríona Ryan, consultant dermatologist at the Institute of Dermatologists ( instituteofdermatologists.ie), tells us five essential things to know if we’re going to incorporate retinol into our beauty routine.

1: What is retinol and what’s its cosmetic role?