No, according to the public health network, dried kelp is a very nutritious food, which contains a lot of iodine and calcium and can be stewed with other foods without black technology. Kelp contains a variety of vitamins and trace elements, especially high iodine content, which can reduce the incidence of radioactive diseases. It can clear cholesterol, reduce the absorption of cholesterol by human body and lower blood pressure, but hyperthyroidism patients are not suitable for eating.