Roselle (Hibiscus sabdariffa L.), also known as the Hibiscus flower, is known as the ruby of the plant world due to its petal color resembling rose red. It has high nutritional value and is an ideal natural health product ingredient. Roselle sepals contain a large amount of carbohydrates, dietary fiber, protein, vitamins, minerals and other nutrients. Among them, carbohydrates have the highest content (68.7%), followed by crude fiber (14.6%), protein (6.71%), and fat (1.01%). The main bioactive components of roselle sepals are organic acids, anthocyanins, polyphenols, and polysaccharides. Numerous studies have shown that polyphenols and organic acids present in the sepals of roselle have various biological activities, including antioxidant, lipid-lowering, hypotensive, antibacterial, and anti anemia effects....