What precautions are advised for eating mustard greens?

Members of the cabbage family contain goitrogens, naturally occurring substances that can interfere with the functioning of the thyroid gland. Dietary goitrogens are usually of no clinical importance unless they are consumed in large amounts or there is coexisting iodine deficiency. Cooking helps to inactivate the goitrogenic compounds.

Individuals with already existing and untreated thyroid problems may want to avoid consumption of cabbage-family vegetables in their raw form for this reason. Mustard greens also contain significant amounts of oxalate. Individuals with a history of oxalate-containing kidney stones should avoid overconsuming them.

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