A clinically proven retinol alternative that strengthens the skin barrier, smooths the look of wrinkles and visibly firms, for skin as smooth as silk. The Silk Serum Retinol Alternative is a visible wrinkle-smoothing, skin-soothing treatment for retinol-like results, while calming irritation. Unlike vitamin A derivatives, The Silk Serum is made to use up to two times daily with no ramp-up time or sun sensitivity.