21. Blood free thyroxine and TSH levels are monitored to help determine whether the dose is adequate. 22. Our bodies need iodine to make the thyroid hormone thyroxine , which is vital for developing brains. 23. You should avoid cabbage, as this reduces the intake of iodine and the production of thyroxine . 24. The onset of TM requires toxic levels of the thyroxine hormone due to overproduction by the thyroid gland. 25. Thyroxine is given to replace the hormones lost and to suppress TSH production, as TSH may stimulate recurrence.26. Colloidal silver may interact with some prescription medications, reducing the absorption of some antibiotics and thyroxine among others. 27. The reduced level of transthyretin in the CSF may indicate a lower thyroxine transport in brains of patients with schizophrenia. 28. As far as vitamins and minerals specifically interfering with thyroxine absorption, I am skeptical that they make much difference. 29. In such cases, increased faecal thyroxine levels in thyrotoxicosis factitia may help differentiate it from other causes of hyperthyroidism. 30. The active form of thyroxine , T 3, has been found to be a potent inhibitor at nanomolar concentrations.