To provide an oral composition for preventing exposure to thyroid gland, which prevents or reduces internal exposure to the thyroid gland by radioactive iodine, and to provide a food and drink for preventing exposure to thyroid gland, which contains the same. An oral composition for prevention of exposure to thyroid gland, which comprises cyclodextrin and prevents or reduces internal exposure to thyroid gland by radioactive iodine, and a food and drink for prevention of exposure to thyroid gland, which comprises the oral composition for prevention of exposure to thyroid gland. Figure 1

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