Starring 5% nature-derived glycolic acid (it comes from sugar cane), this overnight treatment harnesses the cell-stimulating and exfoliating properties of alpha hydroxy acids, which melt the 'glue' that binds dulling dead cells to skin's surface, revealing the healthy 'new' skin cells beneath. What's more, by lowering skin's pH (from 5.5 to around 3), this stimulates cellular activity - accelerating repair and renewal processes, as skin works hard to re-establish equilibrium. It bolsters synthesis of elastin and collagen (the 'scaffolding' that keeps skin firm), while penetrating deep within pores to eradicate spot-causing bacteria - while the resurfacing action also helps to diminish visibility of acne scars, dark spots and brown patches, so your complexion quickly looks more even-toned and luminous. A must-have for anyone concerned with skin ageing, sun damage or problem skin conditions - just build up skin's tolerance gradually (to minimise redness). Apply with a dampened cotton pad, once a week for 2-3 weeks while skin acclimatises - then build up to 3 'neat' applications a week, for maximum anti-ageing and skin-brightening benefit.