[Product Question] Where to add Olay Regenerist Regenerating Serum into routine?

Beauty Tips For Body Care
Current routine:AM Cerave Hydrating Cleanser Vitamin C Serum, wait 15 min Cerave Renewing SA Lotion SunscreenPM Hydrating Cleanser BHA daily wait 15 min AHA 2x/week wait 15 min ROC Retinol Eye Cream NatureWell Retinol Advanced Moisture Cream on rest of faceI would like to add the Olay Regen Serum to improve PIH as it contains Niacinamide. Thanks.
Girls Blog 2015
Submitted by riffdex