In my arsenal of Luzern serums, this one is amongst my favorites. I use it...

In my arsenal of Luzern serums, this one is amongst my favorites. I use it every night after cleansing and exfoliating, and before my nighttime moisturizer. My skin gets irritated easily and throughout the day it encounters the daily pollution and sun exposure that everyone gets, but mine reacts by getting red, itchy, and upset by just anything anything except moderately temperate, not too dry, not too humid, unmoving air! This calms my skin down from all of the stressors of the day!