Exopolysaccharide (EPS) is the main active metabolite of Ganoderma lingzhi in liquid fermentation. In order to increase the content of Ganoderma lingzhi EPS. this study added Vernonia amygdala leaf powder to the fermentation medium. and used single factor experiments and orthogonal experiments to optimize fermentation conditions. https://foldlyers.shop/product-category/accessories-probes/