The thyroid gland needs iodine to produce essential hormones that regulate metabolism. A sufficient daily intake of iodine is crucial for its normal functioning.
The generally recommended daily intake of iodine for adults to ensure normal thyroid function is between 100 and 200 micrograms ($\mu$g).
Therefore, the normal daily requirement for iodine intake for the thyroid gland is100 - 200 $\mu$g.