Kelp is rich in nutrients and trace elements, and its moderate intake by normal people has a positive effect on the maintenance of health. There are no too many contraindications when eating kelp, and it can be eaten with a variety of foods. There is no scientific basis for the rumor that kelp cannot be eaten with foods containing tannic acid, such as persimmons and tea, which may lead to the appearance of substances that are not easily dissolved. In addition, it is also mentioned that it cannot be eaten with foods rich in vitamin C, which is also not scientific. The trace elements and minerals in kelp, along with the ellagic acid and vitamin C content in other foods, are not enough to cause adverse reactions, and the amount consumed each time is not enough to cause serious effects, so it can be safely consumed. However, when consuming kelp, it is important to note that it is not recommended for people with thyroid dysfunction, as this may aggravate the condition. It should be consumed in moderation, according to the patient’s specific situation, to be a healthy diet.