PEANUTS: Although all nuts contain B vitamins, peanuts stand above the rest. They are rich source of VItamin B9 (folate), Vitamin B6, Vitamin B5, Vitamin B2 (riboflavin), and Vitamin B1 (thiamin). Peanut butter is high in vegetarian protein and heart-healthy fats. They are actually legumes but have almost all the qualities that true nuts like almonds have.