Vitex agnus-castus (often referred to as Vitex) is a shrub that originates from the Mediterranean. The herb has grown in popularity in recent years with many published studies documenting its important properties. Vitex berries are used in the manufacture of the herbal extract and contain a wide range of active compounds, including flavonoids. Vitex can be used alongside other food supplements such as Vitamin B6 and Evening Primrose Oil.