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.
Not exact matches
World's Healthiest Foods
also has a great evidence - based article all about
crucifers that I recommend you read.
Consuming raw
crucifers or dark, leafy greens is not an alternative either as the substances that cause problems when in the cooking water
also cause problems if consumed directly with the vegetable in an uncooked state such as a raw green smoothie.