REN Clean Skincare Bio Retinoid Youth Serum is a clinically proven healthy ageing serum that combines a plant-derived alternative to Retinol, Bidens Pilosa, with Ceramides and Niacinamide to visibly even skin tone and pigmentation, plump, smooth, for a firmer-looking skin, while visibly reducing fine lines and wrinkles after just 7 days. Added Niacinamide, a multi-active stable form of Vitamin B3, helps protect against free radical damage and improve brightness for a firmer-looking skin; while Ceramides from Wheatgerm work to strengthen the skin barrier, increase skin hydration, soothe and reduce irritation.