Core System is the essential three-step routine by QMS Medicosmetics: a fruit acid exfoliant that renews the skin and the day and night collagen serums that hydrate and smooth it. It is the foundation on which all the brand's routines are built.

QMS offers it in two sets. The Day & Night 3-Step Core Routine Set includes the 10 % exfoliant and the Collagen Day and Night Serum. The Sensitive set switches to a 7 % exfoliant and the Sensitive serums, with soothing actives. Both come in a travel size (3 × 7 ml) and a large size (3 × 30 ml).