Sunday Riley Sunday Riley AI Smart Retinoid Serum 30ml | Decongest and revitalise your skin with Sunday Riley's ai smart retinoid serum infused with a powerhouse retinoid duo for optimal yet gentle action, leaving your complexion purified and flawless. Marrying two advanced retinoids together hydroxypinacolone retinoate (hpr) and adapinoid the serum reduces the appearance of visible congestion and pores with a gentle yet effective formula, while increasing skin cell turnover and stimulating collagen production, restoring your skin's healthy radiance without irritation.