Check before you startThis one has documented interactions with medication classes where the consequences are serious. If you take any prescription medicine, run it past a pharmacist before starting.
How long to take it
Ongoing if your salt isn't iodized and you eat little dairy or seafood. Especially important in pregnancy.
Who it's actually for
Pregnant and breastfeeding women, people using non-iodized salts, and vegans.
Safe upper limit
Reported1,100 mcg per day
Both too little and too much cause thyroid dysfunction. Kelp products can deliver wildly variable, sometimes enormous doses.
Standard figure, not re-verified this session.
Interactions to know about
- Thyroid medication — Levothyroxine, carbimazole, methimazole
- Lithium — Mood stabiliser — narrow safety window
Run your full list through the interaction check.
Practical notes
- Pink and sea salts are generally not iodized.
- Avoid high-dose kelp — the dose is unpredictable.
- If you have thyroid disease, do not start iodine without your doctor.