The Ordinary amino acids + B5 face serum 30mlAmino Acids + B5 is an ultra thin serum that works with your skin to support its natural hydration barrier. By including a concentrated 17% (by weight) solution of amino acids and amino acid derivatives that mimic your skins natural moisturizing factors, this water based formula keeps the outer layer of your skin protected and well hydrated without feeling greasy. Plus, it uses 5% (by weight) pro vitamin B5 to provide surface and below surface