Educational information, not medical advice — ask your doctor or midwife.
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What is Scullcap?
Scullcap is a calming herb from the mint family. It comes from a small North American plant, Scutellaria lateriflora. The dried leaf and stem are used, never the root.
People take it for worry, stress and poor sleep. It is sold as tea, tincture and capsules. It often turns up in blends with valerian, passionflower or hops.
The honest verdict: human evidence is thin. Two small short trials point to a mild calming effect. Long use in folk medicine is not proof that a herb works, and it is not proof that it is safe.
One more thing matters before you buy. Some products sold as skullcap have held germander instead, a different plant that can harm the liver. Check that the label names Scutellaria lateriflora.
How might it work?
No one has proven how Scullcap works in people.
The lead idea is about GABA, the brain's main calming signal. In test tube studies, compounds from the plant bind to the same brain site that calming drugs use. Animal studies show mild calming and less anxious behaviour.
That work was done in dishes and in rodents. It does not prove the same thing happens after a cup of tea. The dose that reaches a human brain has not been measured well.
A second idea is simpler. Sitting down with a warm drink calms many people on its own. Small trials cannot easily tell that apart from the herb.
What forms does it come in?
You will mostly meet these: - loose dried herb for tea - tea bags, often in "sleep" or "calm" blends - tincture, a liquid extract in alcohol - fresh plant tincture, favoured by many herbalists - capsules and tablets of dried powder or extract
Herbalists often say the fresh or recently dried herb is best. The leaf loses strength as it ages.
Pick a product that prints the full plant name and the plant part. Look for a batch number and a maker you can contact. That is your main guard against the wrong plant in the bottle.
Where does it come from?
Scullcap was a leading nerve herb of the Eclectic doctors in 1800s America.
The nickname mad-dog skullcap came from the 1700s. A New Jersey doctor, Lawrence Van Derveer, claimed it treated rabies after a dog bite.
The claim did not hold up. Rabies has no herbal treatment, and a bite is a medical emergency.
Eclectic and folk healers later gave it for nervous tension, twitching and sleepless nights. Some used it while helping people come off strong sedatives.
None of that was tested the way drugs are tested now. It was recorded, repeated and passed on by doctors who watched their patients.
When to see a doctor
Stop and get urgent care if you notice: - yellow skin or yellow eyes - dark urine or pale stools - pain under your right ribs - sickness or vomiting that will not settle - deep tiredness that is new to you
These can be signs of liver trouble.
Also get help the same day for a rash with swelling of the face, lips or throat, or for trouble breathing.
Book a normal appointment if your anxiety or poor sleep lasts more than a few weeks. Go sooner if your mood is low most days, or if you think about harming yourself.
In the United States it is sold as a dietary supplement, not as an approved drug. In the United Kingdom, the European Union and Australia it is sold as a food supplement or a traditional herbal product. No health claim has been approved for it in those markets.
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 Scullcap 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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