Goitrogens are compounds that can inhibit the function of the thyroid gland by disrupting the uptake of iodine, an essential element for thyroid hormone production. They are most commonly found in cruciferous vegetables such as broccoli, cabbage, and kale, as well as in some fruits, nuts, and other plant-based foods. There are several types of goitrogens, including glucosinolates, thiocyanates, and flavonoids.