How much Iodine do I need each day?

The recommended dietary allowance is 150 mcg for adult women and 150 mcg for adult men, including food sources. The tolerable upper intake level is 1100 mcg.

What does Iodine interact with?

Iodine interacts with Sea moss at a moderate level. The most significant pairing on record involves Sea moss: Check the iodine content before use and have thyroid labs monitored if you take levothyroxine.

What happens if I take too much Iodine?

Symptoms of excessive intake are possible above 1100 mcg daily.

Should I take Iodine with food?

Iodine does not have a strong food dependency, though taking it with a meal reduces stomach upset.

Mineral

Iodine

Iodine requires 150 mcg daily for adult women and 150 mcg for men. The tolerable upper intake level is 1100 mcg.

Last reviewed: 2026-09-20Reviewed by: StackingRight clinical reviewPrimary source

What Iodine does

Substrate for thyroid hormone synthesis.

How much you need

Reference intakes for Iodine in adults
Measure	Adult male	Adult female
Recommended intake	150 mcg	150 mcg
Upper intake level	1100 mcg
Typical supplement dose	150 mcg · 1-2 tbsp

Interactions involving Iodine

2 sourced rules

Interaction rules involving Iodine
Pair	Severity	Mechanism	Action
Sea moss × Levothyroxine	Moderate	Sea moss is often very high in iodine; iodine load can alter thyroid function in both directions and destabilise replacement therapy.	Check the iodine content before use and have thyroid labs monitored if you take levothyroxine.Source
Iodine × Levothyroxine	Moderate	Supplemental iodine can unmask or worsen autoimmune thyroid disease and shift thyroid hormone requirements.	Do not add iodine supplements while on levothyroxine without lab monitoring.Source

Questions people ask about Iodine

Sources

https://ods.od.nih.gov/factsheets/Iodine-HealthProfessional/