Angostura Aromatic Bitters 4oz. The name Angostura comes from the town of Angostura, Venezuela where the flavoring was first produced. This concentrated, botanically-infused alcoholic mixture includes water, 44.7% alcohol, herbs, and spices. This petite 4 oz. bottle of bitters can be used for multiple cocktails since it is to be ingested in small amounts as a flavoring.