Fennel seeds are concentrated source of minerals like copper, iron, calcium, potassium, manganese, selenium, zinc, and magnesium. It helps lower serum LDL cholesterol levels. Furthermore, fennel seeds indeed are the storehouse for many vital vitamins. Vitamin A, vitamin E, vitamin C as well as many B-complex vitamins like thiamin, pyridoxine, riboflavin and niacin particularly are concentrated in these seeds.