Educational information, not medical advice — ask your doctor or midwife.
Ferrum iodatum is a homeopathic single remedy made from iron iodide. Its Latin name is Ferri iodidum. It is also called iron iodide, and it is given on its own, not as part of a mix.
Homeopaths reach for it mainly for swollen neck glands, long-lasting catarrh (thick mucus in the nose or throat), and for people who look pale and feel weak and tired. Some also use it for an enlarged thyroid gland in the neck.
Like all homeopathic remedies, it is made by diluting the starting material again and again. At 30C, essentially none of the original iron iodide is left in the pill. Trials have not shown that homeopathic remedies work better than a placebo (a dummy pill), and long use in a tradition is not proof that something works.
Homeopathy rests on the idea of "like cures like". The theory says a substance that causes symptoms in a well person can ease those same symptoms once it is made very dilute.
Making the remedy means diluting it over and over, with hard shaking at each step. Homeopaths say this leaves an imprint of the starting material in the liquid. Science has found no way for that to happen.
At 30C, essentially no iron iodide remains. So the remedy cannot act on the body the way a drug acts. Any change you notice is best explained by placebo effect, time, and normal ups and downs in how you feel.
Low potencies are a different matter. Forms such as 3X or 6X can still hold small amounts of real iron and iodine. Those amounts can act in the body, which is why the safety notes below matter.
You will usually find it as small sugar pellets that melt under the tongue. Liquid drops in an alcohol and water base are also common.
Tablets and powders made by grinding the salt with lactose (milk sugar) are used at low strengths. Typical labels are 3X, 6X, 6C, 12C and 30C. The higher the number, the more it has been diluted.
Ferrum iodatum appears in homeopathic materia medica (the reference books that list remedies) from the 1800s. Homeopaths linked it to swollen glands, thyroid swelling and pale, run-down states.
Iron and iodine were both mainstream medicines in that era. Doctors gave iron for anaemia (low iron in the blood) and iodine for goitre (a swollen thyroid gland in the neck). The homeopathic remedy borrowed that picture, then diluted the salt far past the point where any of it remains.
Some reactions to Ferrum iodatum need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
See a doctor if a swollen gland or lump in your neck lasts more than two weeks, keeps growing, or feels hard and fixed in place.
Book an appointment if you have a fever that will not settle, night sweats, weight loss you cannot explain, or ongoing tiredness and paleness. These need tests, not a home remedy.
Get urgent help if you have trouble breathing or swallowing, a racing or uneven heartbeat, or a swollen face, lips or throat.
Call emergency services straight away if a child swallows any iron-containing product. Iron poisoning in children can kill, and early symptoms can look mild.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Ferrum iodatum is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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