Neroli, the flowers from the bitter Seville orange, however, are as sweet as lemon blossoms. Their oil produces a blend of floral and citrus that is not only one of the most popular perfume ingredients but is also rich in health benefits, most notably in alleviating stress and anxiety. Neroli is precious among the essential oils. A pound of it is produced from about 1,000 handpicked blossoms—flowers so delicate that even slight bruising can release their oil.