no, not at all. the right amount is the amount that works. i wouldnt have any concerns at all up to a gram a day of KI.
there is a story buried somwhere here that a guy accidently drank SSKI out of a bottle thinking it was something else. they figure he got about 60 grams. he was not happy but he did make a full recovery.
i pit 100 grams in a bath one time and before i knew it i had been in too long. the headache it gave me lasted a couple of days. i figure i must have soaked up a quarter of it. no more Iodine baths for me.