PDRN at 38% in a $43 serum from Sephora. Let me explain why that number matters. PDRN is a skin repair ingredient derived from salmon DNA. It supports cell regeneration, which is exactly what mature skin needs more of. This one from IOPE pairs it with caffeine for puffiness, which is a smart combination. The Bio PDRN concentration is 38%, which is high for a retail product. I picked this up during the Sephora savings event specifically because I am building out a Test and Tell on PDRN. First impressions when it arrives. Linked in my Sephora Sale Picks collection on LTK. Sale ends April 20. LTKOver40 LTKBeauty LTKselfcare