Coffee is one of the most frequently consumed drinks in the world. Coffee silverskin (CS) is the only by-product
produced during the coffee beans roasting process, and large amounts of CS are produced by roasters in coffee consuming
countries. However, methods for the effective utilization of CS have not been developed. Reuse of
CS, which is the primary residue from the coffee industry, is important for the environment and economy.
Recently, there have been some attempts to reuse CS for biological materials and as a nutrient source for solid state
fermentation. The purpose of this review is to provide an overview about CS, its chemical composition,
biological activity, and attempts at its reuse.