Concentrate
The purpose of an concentrate/essence is to prepare clean skin for treatment by kick-starting the skin regeneration process, i.e., initiating cell turnover so that the top layer of the skin (dead skin cells) is shed to reveal “new” skin for improved radiance.  After cleaning your skin, apply toner (to deep clean and prep your skin for the essence). Then apply concentrate/essence by dispensing the product onto your hand (or a cotton pad) and evenly apply all over your face and neck