REN Bio Retinoid Youth Serum is a healthy ageing serum that combines a plant-derived alternative to Retinol, Bidens Pilosa, with ceramides and niacinamide to visibly firm, even tone and reduce the appearance of hyperpigmentation. This wonder working serum also rehydrates skin, leaving it appearing plumper and smoother. Clinically proven to reduce fine lines and wrinkles in 7 days.