The bioeconomy is witnessing a revival of interest in chestnut tannin, a compound extracted from chestnut tree bark or wood, thanks to its versatile applications and environmentally friendly nature. A recent review article led by Rosaria Ciriminna and colleagues delves into the detailed analysis of chestnut tannin's production, chemistry, and its emerging roles in different sectors. The findings are published in the Journal of Bioresources and Bioproducts.