Kosso (ኮሶ): Ethiopia's Traditional Tapeworm Plant
For generations, Ethiopians used the flowers of this tree for something very specific: intestinal worms.
Kosso (Hagenia abyssinica) is an African highland tree with a long history of medicinal use in Ethiopia. Its dried female flowers have traditionally been prepared to expel intestinal parasites, particularly tapeworm.
At a Glance
Scientific name: Hagenia abyssinica
Amharic name: Kosso / ኮሶ
Native to: Eastern Africa
Known for: Traditional use against tapeworm
Traditional Medicinal Use
The dried female flowers are the part of Kosso most commonly associated with traditional medicine.
Preparation varied among Ethiopian communities. The flowers could be dried, ground, and mixed with liquids or foods such as honey. In some areas, the preparation was also fermented.
Different parts of the plant have also been traditionally used for:
Stomach pain
Fever
Coughs and respiratory complaints
Wounds
Some postpartum practices
Kosso eventually became known beyond Ethiopia. Preparations made from Hagenia abyssinica were once included in European pharmacopoeias for the treatment of intestinal worms.
What Does Research Say?
Kosso contains kosins, flavonoids, and other plant compounds that have been studied for their biological effects.
Research supports activity against parasitic worms. Studies have also investigated antimicrobial, antioxidant, and other properties.
Much of the evidence comes from laboratory or animal research, and more clinical research is needed to establish its safety and effectiveness in people.
Safety Matters
Kosso can be toxic, especially in excessive amounts.
Reported side effects include:
Nausea
Stomach pain
Diarrhea
Weakness
Fatigue
More serious toxicity has also been reported with excessive use.
Kosso should not be taken without appropriate guidance. If you have a medical condition, are pregnant, or take medications, consult your healthcare professional before using it.
Did You Know?
Kosso can mean more than one thing in Amharic.
The name has been used for the tree, its flowers, the medicine prepared from them, and in some contexts even the tapeworm itself.
The connection became so strong that the plant, medicine, and condition became linked through language.
More Than Medicine
Wood
The reddish wood has been used for timber, furniture, flooring, and firewood.
Highland ecosystems
Kosso grows in the highlands of East Africa, often at elevations of roughly 2,000 to 3,000 meters.
Conservation
Populations have declined in some areas because of harvesting, forest clearing, and other habitat pressures.
Sources
National Library of Medicine / PubMed CentralResearch on the ethnobotany, medicinal uses, phytochemistry, and safety of Hagenia abyssinica
World Agroforestry / PROTABotanical information, distribution, and uses of Hagenia abyssinica
Published Ethiopian ethnobotanical researchDocumentation of Kosso use and preparation in Ethiopian communities
Published pharmacological researchStudies of the plant's compounds, biological activity, and potential toxicity
This article is for educational purposes only. Kosso can cause toxicity. If you have a medical condition, are pregnant, or take medications, consult a qualified healthcare professional before using medicinal plants.
Explore more medicinal and food plants at drkidi.com/plants · Follow @drkidi.healing · Watch on YouTube @drkidi · Read more on Substack @drkidi
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