Both too little and too much iodine harm the thyroid. UL is 1,100 mcg/day. Kelp and iodine drops can push you past this limit. Check your total intake.
Excess iodine can disrupt thyroid function (hypo- or hyperthyroid symptoms).
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| United States | 150 mcg | 1100 mcg |
| European Union | 150 mcg | 1100 mcg |
| Australia | 150 mcg | 1100 mcg |
| China | 150 mcg | 1100 mcg |
| Japan | 130 mcg | 3000 mcg |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. “Not established” does not mean unlimited intake is safe.
Yes. Both too little and too much iodine can disrupt thyroid function. Excess iodine can trigger hyperthyroidism (rapid heartbeat, weight loss, anxiety) or hypothyroidism (fatigue, weight gain). The UL is 1,100 mcg/day for adults.
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