BazzDry/ResilientI used Vit C during the day and retinol at night. You can also use them alternately at night. Today retinol, tomorrow Vit C30UkaMDry/Resilientthank you 00View 1 more repliesNeginDry/ResilientNo. Use them in different routines. Vitamin C in the morning and retinol at nights 30BlueNWhiteDry/SensitiveBest not to use together in the same routine! 30BGTNOily/Resilientnopeeee10DaveganpicksbymishaOily/SensitiveNope dear..10123