Renewing facial serum with retinol. Visibly reduces imperfections and accelerates the cell renewal process - Yolyn Re Retinol. Yolyn Re Retinol is a renewing serum that contains retinol at a concentration of 0.1%, which acts in the deepest layers of the skin. This is a solution for those who want to regenerate the skin, reduce imperfections and improve its structure. Retinol stimulates collagen production and accelerates the cell renewal process, causing revolutionary changes in the condition of the skin.