Iodide supplementation: 200 micrograms daily or 1,500 micrograms weekly?

Area of Science:

• Endocrinology
• Nutritional Science
• Pharmacokinetics

Background:

• Iodine is essential for thyroid hormone synthesis.
• Understanding iodine bioavailability from different supplement forms is crucial for effective nutritional strategies.
• Daily versus weekly dosing regimens may impact iodine absorption and utilization.

Purpose of the Study:

• To compare the bioavailability of iodine administered daily as diiodotyrosine versus weekly as iodide.
• To assess iodine excretion patterns in euthyroid individuals under different supplementation schedules.

Main Methods:

• Twenty-five euthyroid volunteers were divided into two groups.
• Group A received 200 micrograms of iodine daily as diiodotyrosine for eight weeks.
• Group B received 1,500 micrograms of iodine weekly as iodide for eight weeks.
• Urinary iodine excretion was measured to determine bioavailability.

Main Results:

• Urinary iodine excretion in Group A reached 67% of the applied dose by the eighth week.
• Urinary iodine excretion in Group B reached 65% of the applied dose by the eighth week.
• No significant difference in iodine excretion was observed between the two groups.

Conclusions:

• Daily supplementation with diiodotyrosine and weekly supplementation with iodide demonstrate similar iodine bioavailability in euthyroid individuals.
• The frequency of iodine supplementation does not appear to significantly alter its excretion rate over an eight-week period.
• These findings suggest flexibility in designing iodine supplementation regimens based on patient adherence and convenience.