Educational information, not medical advice — ask your doctor or midwife.
True Unicorn Root is the dried root of Aletris farinosa, a small North American plant. It is also sold as Star Grass, Colic Root or Ague Root. Folk healers used it as a bitter tonic for the stomach and for period problems.
Human evidence is essentially absent. No controlled trials in people support any use of this root. Long use in tradition is not proof that it works, and it is not proof that it is safe.
It is easy to confuse with False Unicorn Root (Chamaelirium luteum). The two plants are not related and were used in different ways. Check the Latin name on any label before you buy.
No one has shown how this root acts in the human body. The ideas below are proposals, not findings.
The root tastes bitter. In herbal theory, bitter plants prompt the gut to make more digestive juices. That idea has not been tested for this plant in people.
The root holds steroidal saponins, a group of soapy plant chemicals. One of them, diosgenin, is used in factories as a starting material for making steroid drugs. Your body does not carry out that conversion, so the root is not a source of hormones.
Some old reports say the fresh root makes people vomit. That effect is direct irritation of the gut lining. It is a side effect, not a benefit.
True Unicorn Root is sold mainly as the dried root. You will find it cut and sifted for teas, as a loose powder, and in capsules.
Liquid forms are common in herbal practice. These include tinctures and fluid extracts made with alcohol.
It also turns up in blended "women's tonic" products. Some of those blends in fact contain False Unicorn Root. Read the Latin name on the panel.
The fresh root is not sold. Old accounts describe it as sharply irritating to the gut.
Eclectic physicians in the United States wrote about this root through the 1800s and early 1900s. It appears in King's American Dispensatory and in other books of that school.
They gave it in small doses as a bitter stomach tonic. It was used for poor appetite, wind and griping belly pain.
It was also listed as a "uterine tonic". Writers of the day used it for absent or painful periods, and some gave it in pregnancy. Those practices reflect the beliefs of that era and are not a guide for use today.
Settler use drew on earlier Native American use of the plant, though records of that are thin. Interest faded as the Eclectic movement died out.
Stop taking it and see a doctor if you get vomiting or diarrhoea that lasts more than a day.
Also stop and get seen if you have:
Belly pain that is severe or will not ease.
Blood in your vomit, or black tarry stools.
Dizziness, a dry mouth and little urine, which point to fluid loss.
A rash, swelling of the lips or face, or trouble breathing. Call emergency services for these.
If you are pregnant and have taken it, tell your midwife or doctor. Go straight to hospital for bleeding or cramping.
In the United States it is sold as a dietary supplement. It is not approved as a drug for any condition, and claims to treat illness are not allowed.
In the UK and the EU it is not an authorised herbal medicine and is rarely stocked.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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