Angostura bitters are made of water, alcohol, herbs and spices. These concentrated bitters are used for flavoring drinks (and sometimes for flavoring food). The exact formula of the Angostura bitters is a closely guarded secret. Angostura aromatic bitters is not bitter when added to a drink, but it has the ability to marry flavors. It works by enhancing the flavor of ingredients in drink preparations thereby bringing out the best in them without masking their true flavor. It tempers the acidity of citrus ingredients. That's also why Angostura aromatic bitters is known to settle the stomach. Angostura aromatic bitters are sodium and Gluten-Free. Find here some of the best cocktail recipes with Angostura bitters as one of the cocktail ingredients. Cheers!