The American Thyroid Association today released a statement advising against the ingestion of iodine and kelp supplements containing in excess of 500 mcg iodine daily.

Recommended daily allowances for iodine intake are 150 mcg for non-pregnant adults. During pregnancy and lactation, higher iodine intakes of 220-250 mcg in pregnant women and 250-290 mcg in breastfeeding women in the U.S are encouraged.

The public is advised that many iodine, potassium iodide, and kelp supplements contain iodine in amounts that are up to several thousand times higher than the daily Tolerable Upper Limits for iodine.