Citrus aurantium amara flower extract is a fragrant oil extract obtained from bitter orange flowers with a gentle orange blossom scent. It is significantly different from bitter orange flower oil, which is a pure essential oil distilled from the flowers (also called neroli oil).
The ingredient is made by steeping the bitter orange blossoms in a carrier oil (usually sunflower), resulting in an oil extract with the beautiful and refreshing aroma of bitter orange blossoms.
Different manufacturers might have different ways of extracting the oil, e.g. with hot water, glycerin, or hydrocarbons.
Science
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Safety Assessment of Citrus Flower- and Leaf-Derived Ingredientsas Used in Cosmetics. Cosmetic Ingredient Review Expert Panel, 2016
Products with Citrus Aurantium Amara (Bitter Orange) Flower Extract