Leek microgreens contain many vitamins and nutrients, including vitamins A, B6, C, E, and K, as well as magnesium, iron, and fiber. Vitamins and minerals Vitamin A: Leeks are high in provitamin A carotenoids, including beta carotene Vitamin B6: Leeks are a good source of vitamin B6 Vitamin C: Leeks are a good source of vitamin C Vitamin E: Leeks contain vitamin E Vitamin K: Leeks are a good source of vitamin K Potassium: Leeks contain potassium Manganese: Leeks contain manganese Magnesium: Leeks contain magnesium Folate: Leeks are a very good source of folate Riboflavin: Leeks contain riboflavin Copper: Leeks contain copper Iron: Leeks contain iron Other nutrients Fiber and Omega-3 fatty acids.