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) |
|---|---|---|
| US (FDA) | 150 mcg | 1100 mcg |
| EU (EFSA) | 150 mcg | 1100 mcg |
| AU (TGA) | 150 mcg | 1100 mcg |
| CN (CNS) | 150 mcg | 1100 mcg |
| JP (MHLW) | 130 mcg | 3000 mcg |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. Exceeding the UL long-term may cause the toxicity symptoms described above.
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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