Does the use of maize flour in thyroxine tablets hinder the absorption of the thyroxine itself?
It is true that maize contains a small amount of thiocyanate precursor and thiocyanate can reduce the formation of thyroid hormone. However, large quantities of thiocyanate are needed to have this effect. The relative size of a thyroid hormone tablet and an ear of corn makes it clear that there is far too little thiocyanate in thyroid hormone tablets to have any effect whatever on thyroid hormone production. Moreover, if your thyroid has already stopped working, it will not matter how much goitrogen you consume, because you cannot reduce thyroid hormone production any further. Maize flour does not interfere with thyroxine absorption or action.
