Butterhead lettuce is tender and mild, with the sweeter leaves at the center. It has a softer, buttery texture. Butterheads are always a favorite for salads and stand up well to most dressings. It can also be made into shakes and smoothies. Butterhead lettuce is brimming with vitamins and nutrients. It is an excellent source of vitamin A, vitamin C, vitamin K, calcium, and iron, which help fortify bones and fight off inflammatory diseases.