Super-natural and brimming with powerful active ingredients, we caught up with IMMUNOCOLOGIE's awe-inspiring creator - Karen Ballou - who talked us through 'the science bit' and shared her pearls of beauty wisdom

We're totally potty about clay (ha), but with its spectrum of colours and myriad metals, finding the 'right' one is no easy task; there's kaolin, bentonite, french green and rose... and these different goops have distinct compositions, so here's a guide to help locate your skin's clay-based soulmate.