I have been using MDSUN Super Hydration B Serum for some time (in the morning) and love it. Where would it fit in to the evening skincare routine of prescription Retinoid and Wrinkle Smoothener? by Lucy Rxx 08.07.2016

Skincare routine recommended as follow.
Daytime: Super Hydration B Serum -> Moisturizer -> Sunscreen (SPF30 or above)
Nighttime: Super Hydration B Serum -> Mixture of prescription Retinoid (Tretinoin) and Wrinkle Smoothener -> ** Moisturizer
** If your skin is dry, you can apply as much moisturizer as you like during the day to counteract the dryness.