The antioxidant properties of coffee by products including grounds and silver skin are 500 times greater than those of vitamin C, according to recent research.
“Coffee companies produce annually more than 2 billion tons of by products such as coffee spent grounds and coffee silverskin. And most of which are thrown away and are not recycled for other purposes,” said the study’s researchers.
Reference: Jimenez-Zamora A, Pastoriza S, Rufian-Henares JA, et al. Revalorization of coffee by products, Probiotic, antimicrobial and antioxidant properties. LWT. 2015:61(1):12-18