goitrogen
2 interactions related to goitrogen
cabbage + levothyroxine
Cabbage and other brassica vegetables release thiocyanates and goitrin that can compete with iodide uptake at the thyroid and interfere with hormone synthesis. In normal, mostly-cooked portions this has no meaningful effect on levothyroxine in iodine-sufficient adults. Concern is limited to very large, sustained raw-cruciferous intakes or iodine-poor diets.
cauliflower + levothyroxine
Cauliflower is a cruciferous vegetable whose breakdown products (thiocyanates) can theoretically compete with iodine uptake by the thyroid. In practice, a 2024 systematic review found brassica vegetables at normal dietary intakes do not impair thyroid function when iodine is adequate, and because levothyroxine is hormone you swallow as a tablet, ordinary cauliflower portions do not meaningfully affect it.