Not only does romaine lettuce have a unique flavor, but it is also nutritionally outstanding. The nutritional value of romaine lettuce is similar to that of lettuce but higher, and it is also higher than its close relative—celery. The protein content of romaine lettuce is 40% higher than that of celery, its carotene content is 1.4 times higher, its calcium content is twice as high, and its iron content is 33% higher. Among green leafy vegetables, romaine lettuce is rich in vitamins, calcium, and iron. Its content of vitamin A, B vitamins, and vitamin C is quite high, earning it the reputation of being a premium among "raw-eating vegetables."
Romaine lettuce also has certain therapeutic effects. It plays a positive role in lowering cholesterol, treating neurasthenia, and clearing heat and moistening the lungs. In particular, romaine lettuce is high in vitamin C, which has significant effects in treating scurvy, preventing arteriosclerosis, and acting as an antioxidant.