When to take it
Once daily with food.
← All supplements
MineralsStrong evidence
Iodine
Also known as: iodide, I
Iodine is essential for making thyroid hormones, which regulate metabolism and the development of the foetal brain. Table salt is commonly iodised, so a supplement is mainly needed by pregnant and breastfeeding women or people who do not use salt and eat no fish or dairy.
What it is used for
- Normal production of thyroid hormones – strong evidence (EFSA)
- Normal foetal brain development with adequate intake in pregnancy – strong evidence
- Energy and metabolism support without deficiency – weak evidence
Forms and how they differ
potassium iodide
standard, precisely dosed form
from seaweed (Fucus, kelp)
natural source, but iodine content can vary and sometimes be very high – check the label
Pairs well with
Selenium.
Do not combine / separate
Do not combine several iodine products or high-iodine seaweed products.
Watch out for
With thyroid disease (Hashimoto's, Graves' disease, nodules) and if you take thyroid medication, use iodine only after agreeing with your doctor. In pregnancy discuss the dose with your gynaecologist.
Safety
EFSA set an upper limit of 600 µg iodine per day for adults (food and supplements combined). Both excess and deficiency can disturb thyroid function.
Practical tip
If you use iodised salt and eat fish or dairy, you probably do not need an iodine supplement.
Products containing Iodine 9
Iodine 225 µgionic (potassium iodide) · 225 µg / serving
Iodine potassium iodide 100 µgpotassium iodide · 100 µg / capsule
Iodine 150 µgpotassium iodide · 150 µg / serving
Iodine kelp extract (Fucus vesiculosus) 150 µgkelp extract (Fucus vesiculosus) · 150 µg / capsule
Iodine 150 µgkelp (Ascophyllum) · 150 µg / tablet
Iodine 225 µgkelp · 225 µg / tablet
Iodine kelp extract 325 µgkelp extract · 325 µg / serving
Iodinekelp powder
Iodineiodine + potassium iodide
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence
Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.
Combination check
Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.
Check Iodine with othersWhich supplements do you actually need?
Fénix Methode picks them from your blood results and schedules when to take what – no needless purchases.
From the same group
Bone support blendModerate evidenceBoronWeak evidenceCalciumModerate evidenceChromiumWeak evidenceCopperWeak evidenceElectrolytesModerate evidence
Important notice
This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.