Angostura Bitters 4OZ is a concentrated aromatic bitters bottled at 44.7% ABV (89.4 proof) in a 4-ounce (118 ml) bottle, produced in Trinidad and Tobago. Originally formulated in 1824 by Dr. Johann Siegert, this is arguably the single most essential bitters in cocktail history — a fixture behind virtually every professional bar in the wor