Leaf lettuce is a head lettuce variety whose leaves grow separately as opposed to bunched in a tight head like other lettuces. There are two basic types: green leaf and red leaf. However there are many varieties of each type.
Leaf lettuce is a source of vitamins A, C, K, and small amounts of folate, manganese, potassium, iron, and calcium. Like all lettuces it is low in calories. The darker outer leaves are a more concentrated source of the antioxidants present in leafy greens. In general, red leafed lettuces contain greater levels of antioxidants and vitamin C, and green leaf lettuces contain more carotenoids.
Salad mixes, salads, sold as is, prepared meals, prepared sandwiches