Underberg Bitters = 4 units by 30btls 120 btls. Underberg is so much more than a simple bitter – Underberg is unique and inimitable. The recipe and processing methods have been secrets held and guarded by members of the Underberg family, since its launch by company founder Hubert Underberg in 1846. This experience and knowledge regarding how to carefully extract the valuable herbal essences from 43 countries and how to turn them into an aromatic bitters has been safeguarded by a secret procedure. For more than 150 years, this natural European remedy has been used to ease indigestion.