The Recommended Daily Allowance (RDA)
for iodine is 150mcg daily. The RDA is not
for optimal health but to prevent obvious disease states such as rickets, scurvy, or a goiter for instance.
The Tolerable Upper Limit (TUL) of iodine intake is 1100 mcg. Most people can tolerate at least 1000 mcg of iodine daily without adverse effects but those with autoimmune thyroid disease may tolerate less than this. Too much iodine produces a condition called iodine induced hyperthyroidism.