Institut Esthederm specialise in focusing their products on an individual 'hero' ingredient - in this case vitamin A - & concentrating the formula to maximise its efficacy. This serum contains 0.5% pure, perfectly stabilized Retinol & is a unique offering - an 'oil serum' that allows the Retinol to be immediately available. By tackling the skin's surface complaints as well as issues on a deeper, dermal level, the serum is fantastic at dealing with wrinkles and delivering a real 'lifting' effect.Institut Esthederm's Intensif Vitamine A Serum is an anti-ageing oil with a high concentration of Vitamin A, or Retinol (0.5%) - one of the few ingredients universally proven to reverse physical sun damage and wrinkles. This oil serum works on two levels, stimulating cellular renewal and smoothing out lines on the surface of your skin, while encouraging collagen production which strengthens tissue at a deeper level in the dermis. The result: plumped, smoother skin and fewer wrinkles.