Educational information, not medical advice — ask your doctor or midwife.
Common club moss (Lycopodium clavatum) is a low, creeping evergreen plant of European heaths, moors and open woods. Despite the name, it is not a true moss. German speakers call it Bärlapp.
Two very different things are sold under its name. One is the fine yellow spore powder, used for centuries as a dry dusting powder. The other is the green plant itself, which holds alkaloids that are poisonous to animals.
The honest verdict: there is no good human research showing that club moss treats anything. Traditional use is not proof that a remedy works, and it is not proof that it is safe. This page gives no dose, because the plant is best treated as a toxic plant rather than a tea herb.
No one has shown that club moss changes the course of any illness in people.
In test-tube studies, clubmoss alkaloids such as lycopodine can block acetylcholinesterase. That is an enzyme that clears acetylcholine, a nerve messenger. Whether this happens in the human body at any safe amount is not known.
A related plant, Huperzia serrata, is the source of huperzine A, which has been studied for memory. People often mix the two up. Common club moss is a different plant and should not be treated as a source of huperzine A.
The spore powder acts in a simple physical way. Its oily, water-repelling coat makes skin surfaces slide instead of rub. That is a surface effect, not a medicine.
Homeopathic "Lycopodium clavatum" pellets are diluted so far that little or none of the plant remains. There is no accepted way for such a product to act, and trials have not shown an effect beyond placebo.
You may meet club moss in these forms:
- Loose yellow spore powder, sold as lycopodium powder. - Skin dusting powders, now largely out of use. - Dried cut herb and tinctures, sold by some herb suppliers.
Other forms include:
- Homeopathic pellets, drops and creams labelled Lycopodium clavatum, often as 6C or 30C. - Non-medical products: stage and film flash effects, fingerprint powder, and a coating for pills.
The loose powder burns fiercely as a dust cloud. That is why it was a stage and photography flash material.
Club moss has a long written record in European folk medicine, going back to the Middle Ages.
The spore powder picked up names such as Hexenmehl (witch's flour) and vegetable sulphur. Village healers and early pharmacists dusted it on chafed skin, nappy rash and sore wounds. Pharmacists also rolled pills in it to stop them sticking.
The green herb was taken for urine and bladder trouble, kidney stones, gout and rheumatic aches. Some old sources also list it as a purge, and as a herb used to bring on a period. These records tell us what people believed, not what the plant does.
In 1828 Samuel Hahnemann brought Lycopodium into homeopathy, where it became a well known remedy for gas and digestion. Surgeons later dropped spore powder from gloves after it was linked to lumps of inflamed tissue in wounds.
Some reactions to Common club moss need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Call your local emergency number or a poison centre at once if someone has swallowed the plant.
Get emergency help for any of these: - Repeated vomiting, severe stomach cramps or bloody diarrhoea - Heavy drooling, sweating or watery eyes - Muscle twitching, weakness or a seizure - A slow or uneven pulse, fainting or confusion - Trouble breathing, chest tightness or wheezing after breathing in powder - Burns after a powder flash
Take the pack or plant with you if you can. See your doctor within a day if you get a rash, less urine than usual, or swelling in the legs after any contact.
In Germany and the wider EU, club moss herb is not an approved medicine, though the spore powder is still sold as a technical and pharmacy powder. Homeopathic Lycopodium clavatum products are registered as homeopathic medicines in the EU and the United States, which covers quality and labelling rather than proof of benefit. In the United States the dried herb may be sold as a supplement, and the FDA does not review such products for effect before sale.
Do not swap one remedy for another on your own. Bring the problem to your GP (family doctor) or a pharmacist, and ask about these options.
- For burning or frequent urination: your GP can test for infection and treat it properly. - For gout: a GP can prescribe drugs that lower uric acid and settle an attack. - For kidney stones: a GP or urologist (kidney and bladder doctor) can scan and advise on fluids and treatment. - For bloating and gas: a pharmacist can discuss simple options such as peppermint oil capsules, and a GP can rule out other causes. - For nappy rash or chafing: a pharmacist can recommend a tested barrier cream instead of loose powder.
Graded pages for the options named above:
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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