21 Jul 2015 --- DSM claims to have launched the first and the only digestive enzyme demonstrated to effectively break down residual gluten in the stomach to the US dietary supplement market. Tolerase G – or Aspergillus Niger prolyl endoprotease (AN-PEP) – is ideal for the rising number of gluten sensitive consumers following a gluten-free diet who want help digesting hidden or residual gluten that may be found in a broad range of foods.