Best Goitrogen Level-Rich Foods for Horses

Ranked by goitrogen level content among foods safe for horses in the Creature Feast catalog.

Kale per 2-3 leaves as treats Kale contains goitrogens (glucosinolates) that can interfere with iodine uptake. In the small quantities fed as treats (a few leaves), this is not a concern. Large daily volumes should be avoided.

Broccoli per 1-2 small florets Broccoli contains goitrogenic compounds but is typically fed in such small amounts to horses that thyroid effects are negligible. A floret or two as a treat is perfectly safe.

Cauliflower per 1-2 small florets Cauliflower is a cruciferous vegetable with goitrogen content similar to broccoli. Occasional small pieces are safe treats; avoid feeding large quantities regularly.