There are compounds in the brassica family of vegetable such as broccoli, cabbage, and brussels sprouts
called goitrogens.
After that all modern studies done on whole veggies and on the isolated compounds (that were just assumed to be Goitrogens I have yet to find a study that isolated these so
called Goitrogens and found a link) found that they were only beneficial to health.
Certain veggies, especially the cruciferous veggies, contain natural chemicals
called goitrogens that can interfere with thyroid hormone synthesis.
Kale has a component
called goitrogens, a substance that can contribute to enlarging your thyroid and limiting the function of your thyroid gland — in turn, lowers your metabolism.
Soy contains substances
called goitrogens which are potent anti-thyroid compounds that can lead to endocrine disruption and thyroid disorders.
Not exact matches
The
goitrogens found in cruciferous vegetables are
called glucosinolates.
In addition to
goitrogens, crucifers also contain substances
called nitriles that can release cyanide into tissues and result in general toxicity at high doses.15 A 2004 study conducted in Japan suggested that massive doses of nitriles, doses that are impossible to obtain from food, would be required in order to result in toxicity.16 This study used behavioral endpoints such as restlessness to judge toxicity.