Napiers Best British Bitters is a traditional herbal digestif.
It has many uses, but most notably:

• Aiding digestion - After overindulgence in alcohol, rich or spicy food, shellfish and other minor digestive challenges.
• Stimulating appetite - Taken as an aperitif before a meal. Bitters act as a stimulate to improve appetite, assisting in the production of saliva and bile to aid digestion. This product is particularly helpful for those who have lost their appetite, such as the elderly or convalescent.