Another potentially valuable source of verbascoside
includes industrial by-products. For example, olive mill waste that was
obtained as a by-product from the processing of olive fruit was found to
contain abundant amounts of verbascoside in addition to several other
phenolic compounds (e.g., oleuropein, hydroxytyrosol, caffeic acid and
some flavonoids; Obied et al., 2007). Verbascoside was reported to be
abundant in olive mill wastewater (De Marco et al., 2007). Although
more detailed research is needed, olivemill wastewater could be considered
to be a potential source of verbascoside (and concomitant bioactive
molecules) that are suitable for applications involving dietary supplements
and food (Cardinali et al., 2012).