Our ultra-gentle serum helps to calm and hydrate irritated, red, and sensitive skin. Formulated with the most delicate yet effective ingredients, the Probiotics Micro-Biota Fortifying Sensitive Face Serum helps quench and soothe the skin.. The Science. • Probiotics work to soothe inflammation, strengthen the skin's barrier, and diminish blemishes.. • Cucumber Fruit Extract helps hydrate, soften, refresh, and revitalise your skin. It will also work to diminish pores and clarify your complexion.. • Marshmallow Root Extract helps to provide instant hydration and also continuously works to improve the skin's ability to retain moisture. With anti-inflammatory benefits, it can be beneficial for those with rosacea or eczema.