Medik8 Crystal Retinal 3 Serum, £49 / $64 Best retinol for beginners: CeraVe Resurfacing Retinol Serum, £18.28 / $14.99 Best night time retinol: Skin + Me Retinoid-Powered Night Treatment Best ...

Retinol has become somewhat of a beauty buzzword in recent years, with people of all ages reaching for the lauded skincare serum. But what exactly is retinol? How does it work? And who is it best for?