Porphyra can be eaten often, but not too much. Porphyra can supplement some iodine to human body, because it is rich in iodine, but also contains high calcium, choline and iron, which can enhance memory, treat anemia, promote bone growth and health care, improve immunity and prevent cancer. Porphyra is sweet, salty and cold. Has the effects of resolving phlegm, softening hard mass, clearing away heat, promoting diuresis, tonifying kidney and nourishing heart. However, the content of salt and monosodium glutamate in laver is high, which is not suitable for long-term continuous consumption.