R. damascena was identified as one of the species as having the highest flavonoid content (J. Agric. Food. Chem. 2010 Oct 4)
What are flavonoids and what do they do?
Flavonoids are a group of plant metabolites thought to provide health benefits through cell signalling pathways and antioxidant effects. These molecules are found in a variety of fruits and vegetables. Flavonoids are polyphenolic molecules containing 15 carbon atoms and are soluble in water.