Also known as the ‘stratum corneum’, the skin barrier is the outermost layer of our skin. ‘It’s primarily composed of lipids (fats) and corneocytes – dead skin cells that have undergone a process called keratinisation,’ explains Sarah Murrell, co-founder of By Sarah London.
We have these all-important defences to thank for the health of our skin, according to Dr Aiza Jamil, skin expert at Sk:n Clinics. The skin barrier has two primary functions, she says – it works to ‘regulate water loss from the inside out, retain
