Educational information, not medical advice — ask your doctor or midwife.
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Iris versicolor is a homeopathic remedy made from the root of the blue flag plant. It is a single remedy, which means it is made from one source, not a blend. Homeopaths reach for it most often for sick headaches with nausea, and for burning in the stomach and gut.
The remedy is made by diluting the root again and again, with hard shaking at each step. At the common 30C strength, the dilution is so extreme that none of the starting plant is left. What you swallow is a sugar pill or a drop of water and alcohol.
Long use in homeopathy is not the same as proof that it works. No human trials of this remedy have been published, and trials of homeopathy as a whole do not tell it apart from placebo (a dummy treatment). Everything below tells you the tradition and the evidence as two separate things.
There is no known way for a 30C dilution to act on the body, and no trial shows that it does.
Homeopaths work from two ideas. The first is that a substance which causes symptoms in a well person can help a sick person who has those same symptoms. The second is that shaking at each step of the dilution leaves some effect behind, even when no plant is left.
Neither idea fits what we know about chemistry or the body. At 30C there is nothing left to touch a nerve, a gut lining or a blood vessel.
The raw blue flag root does have real effects. It is a strong gut irritant and makes people vomit. That belongs to the raw plant, not to the diluted remedy.
Sugar pills and tiny round pellets are the most common form. You let them melt under the tongue.
Liquid drops in water and alcohol are also sold, usually in a dropper bottle.
Strengths run from low (1X, 3X, 6C) to high (30C, 200C). Higher numbers mean more dilution, so less chance that any plant is present. Blue flag root also appears in herbal tinctures and capsules, which are a different product with a much higher risk of gut upset.
Blue flag is a marsh iris native to eastern North America. Native American groups used the root as a strong purge, meaning it emptied the bowels, and on skin sores.
Eclectic doctors in the 1800s United States used it for liver and skin complaints. Homeopathy took it up in the same century after provings, the tests where healthy people take a substance and write down what they feel.
Its homeopathic picture has stayed much the same since then: one-sided headache with vomiting, sour burning in the throat, and greasy skin.
See a doctor if a headache is the worst you have ever had, comes on like a thunderclap, or comes with fever, a stiff neck, confusion, weakness on one side or trouble speaking. Call emergency services for those signs.
Book an appointment if heartburn keeps coming back, if swallowing hurts, if you are losing weight without trying, or if you see blood in vomit or black tarry stools.
Get help the same day if vomiting or diarrhoea stops you keeping fluids down, or if a child or older person becomes floppy, dry-mouthed or stops passing urine.
See a doctor within three days of any blistering rash in a band on one side of the body, as that may be shingles and works best when treated early.
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 Iris versicolor 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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