 Depending on the variety, lettuce is an excellent source (20 % of the Daily Value, DV, or higher) of vitamin K (97 % DV) and vitamin A (21 % DV) (table), with higher concentrations of the provitamin A compound, beta-carotene, found in darker green lettuces, such as Romaine. With the exception of the iceberg variety, lettuce is also a good source (10-19 % DV) of folate and iron (table).
