.. don't suppliment with VitA WITHOUT sufficient iodine ?
A question raised by these findings is the safety of VA repletion without concurrent iodine repletion in children with coexisting VAD and severe IDD. Our data suggest that moderate VAD in severely iodine-deficient children may reduce the risk for hypothyroidism. The data are consistent with the possibility that VAD may decrease activation of the pituitary retinoid receptor, thereby increasing transcription of the TSHß gene and increasing TSH secretion (19, 20, 21). Increased TSH stimulation of the thyroid increases thyroid size, but maintains circulating thyroid hormone, protecting against hypothyroidism. Additional studies are clearly needed to resolve this question. Until then, a prudent course would be to provide oral iodized oil along with VA supplements to children in areas of severe endemic goiter that do not yet have IS
(note sunscreen can also be a problem)
other links on iodine
http://tealady-health.blog.co.uk/?tag=iodine