Spanish broom flowers are used to make medicine. They are used for constipation and fluid retention, inducing vomiting, improveing function of the heart, the treatment of dropsy, heart arrhythmias, albuminuria and gallstones.
In foods and beverages, Spanish broom is used as flavoring.
In manufacturing, Spanish broom is used as a fragrance in soaps and cosmetics. 
The whole plant has diuretic, laxative, emetic, emmenagogue and cardiotonic properties. It is used for the treatment of dropsy, heart arrhythmias, albuminuria and gallstones. Also, the plant has anti-diabetic action as the herbal extract reduces the blood sugar levels. 
Its flowers extract has shown antiinflammatory and analgesic effects. 
 Webmd: Spanish Broom - Uses, Side Effects, and More
 UNIVERSITY of IOANNINA SCHOOL of HEALTH SCIENCES FACULTY of MEDICINE Department of Pharmacology, Medicinal Herb, Spartium junceum.
 Luigi Menghini, Paola Massarelli, Giancarlo Bruni, and Rita Pagiotti: Anti-Inflammatory and Analgesic Effects of Spartium junceum L. Flower Extracts: A Preliminary Study, JOURNAL OF MEDICINAL FOODJ Med Food9 (3) 2006, 386-390
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