Serum by Sunday Riley Skincare level: expert Highly concentrated retinoid serum Suitable for all skin types Designed to target the visible signs of ageing and improve the look of congested and sun-damaged skin Formulated with 5% retinoid ester blend, 1% liposomal-encapsulated retinol blend and 0.5% blue-green algae with natural, retinoid-alternative activity Encapsulated CoQ10 works to improve ageing or damaged skin while Hawaiian white honey, bisabolol, cactus extract, and ginger soothe and balance Carry out a patch test before use Product is non-returnable for hygiene reasons