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Everything here is reference information drawn from the research literature, not medical advice, and Lamduan is neither a doctor nor a pharmacist. Supplements are not medicines and do not replace anything a doctor has prescribed. If you take regular medication, are pregnant or breastfeeding, have liver or kidney disease, or have surgery coming up, speak to a pharmacist or doctor before starting anything on this page.
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All supplements 75
Tap a name for all six answers. Every answer carries a badge saying how strong the evidence is, and where the marketing does not match the research, it says so plainly.
The mineral the thyroid uses to build its hormones. Iodised salt has made deficiency far less common than it once was.
🎯What it helps withStrong evidence
Preventing goitre and hypothyroidism from deficiency. It matters most in pregnancy, where it affects fetal brain development.
⚗️Effect on hormonesStrong evidence
It is the raw material of thyroid hormone — but both too little and too much cause thyroid disease, which surprises most people.
Weight and fat lossNo human data
Does not reduce fat. Taking iodine to speed up a normal thyroid does not work and can be harmful.
🌙SleepNo human data
No direct effect on sleep.
❤️Other health effectsStrong evidence
Thyroid, basal metabolism and fetal brain development.
📏Dose and ceiling
Commonly used: 150-300 mcg per day
1,100 mcg/day — IOM; EFSA says 600. Kelp products are the easiest way to exceed it, since their iodine ranges from 16 to 2,984 mcg per gram.
Caution
Excess causes the same picture as deficiency — goitre and hypothyroidism — or the opposite, thyrotoxicosis. People with autoimmune thyroid disease react at much lower doses and must ask a doctor first. Be wary of thyroid support products containing kelp with no stated amount.