What is a serum? A serum is a high concentration of high performance or a strong concentration of active ingredients designed to absorb deeper than a moisturiser can 💪🏽 Usually a serum is quite specific to what skin concern it’s designed to improve eg. Pigmentation, Anti-Ageing, Hydration, Redness. esmi has 4 serums in our range. 🧡💚💙💜 #atyourskinservice #feedyourskin #esmiskinminerals