Any advice on iodine intake .... I think I may have been over dosing as have read two books, iodine and your thyroid by Robert Thompson , he says you need to take between 50- 75 mg per day ..... The other book I am reading by Isabella Wentz says you should only take 52mcg per day .... I am taking 200 mcgs in a thyroid supplement recommended by Marion Gluck clinic and 400 mcg iodine from kelp ( which includes 40 mcg salt from kelp ) ....... Any advice ? And is there a test in UK that can test for levels ... Could this have affected my recent low T4 and T 3....