Works to protect the skin after a treatment [SEP] I'm  new to the Zeriod brand but have had very good experience with Japanese and Korean skincare brands and products. This Zeriod Dermarenewal Revitalizing Ampoule is geared towards sensitive and combination skin. The tube is small but I only need a little drop. The ampoule is quickly absorbed into the skin and protects and hydrates.  It is for additional protection to the skin after a procedure, so I don't use it daily.  Instead, I would use it after a facial or an intense exfoliation.