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Ajuga / Common Bugle (Ajuga reptans)
Materia Medica
Family: Lamiaceae
Accepted name: Ajuga reptans L.
Common names: Common Bugle, Bugle, Creeping Bugle, Carpet Bugle, Bugle Flower
Part historically used: Primarily aerial herb / flowering herb in European folk use
Growth habit: Spreading stoloniferous perennial groundcover
Native range: Europe to northern Iran and northwestern Africa
Primary tradition: European folk herbalism
Actions & Energetics
Traditional European use describes Common Bugle as an astringent, vulnerary, hemostatic, and anti-inflammatory herb, especially in older household applications for minor wounds, bruises, and irritated tissues. Those are traditional descriptions rather than modern clinical indications.
- Traditional actions: Astringent, wound herb, local hemostatic, soothing to irritated tissues
- Modern research interests: Wound healing, hemostatic activity, inflammation, hepatoprotection, antimicrobial activity, iridoids, phenylpropanoid glycosides, and phytoecdysteroids
- Evidence level: Mostly laboratory and animal research; strong human clinical evidence is lacking
Botanical Description
Ajuga reptans is a low, spreading perennial that forms mats by stolons rooting at the nodes. Kew describes it as a stoloniferous herb reaching about 30 cm tall. Leaves are petiolate, often oblong to spoon-shaped, with shallowly wavy or sinuate margins; ornamental cultivars may have green, bronze, purple, cream-variegated, or multicolored foliage.
Flowering stems rise above the basal mat. The inflorescence consists of whorled clusters of flowers subtended by leafy bracts. Flowers are usually blue to violet, more rarely pink or white. The tubular corolla is bilabiate: the upper lip is very short and two-lobed, while the lower lip is three-lobed. Four stamens extend from the flower.
Name Confusion & Look-Alikes
“Bugleweed” is an ambiguous common name. It is sometimes used for Ajuga reptans, while in North American herbal commerce it commonly refers to Lycopus virginicus, Lycopus europaeus, or related Lycopus species. These plants are all in the mint family but have different chemistry, uses, and safety concerns, so the botanical name should always be confirmed.
Thyroid-related herbal claims associated with Lycopus should not be transferred to Ajuga reptans. Likewise, research on other Ajuga species should not automatically be treated as evidence for Common Bugle.
Traditional Indications
Historical European use centered on minor wounds, bruises, local bleeding, irritated skin, and astringent applications. Older herbals also record internal use for coughs, mouth and throat complaints, digestive complaints, and other household purposes.
These traditional indications are useful for understanding the herb’s history, but they do not establish that Common Bugle treats infection, liver disease, inflammatory disease, or other medical conditions.
Preparations & Dosage
Infusion / Tea
Traditional sources describe infusions of the aerial herb, but no well-established modern evidence-based oral dose for Ajuga reptans has been established from human clinical trials. A universal household tea dose would therefore be speculative.
Tincture
Historical and modern herbal preparations may use alcohol-water tinctures, but no standardized human clinical tincture dose for this exact species has been established.
External Wash / Compress
Traditional wound use commonly involved the fresh herb, washes, compresses, or other local preparations. These practices should be limited to minor, superficial applications. Deep wounds, persistent bleeding, infected wounds, or significant trauma require appropriate first aid and medical care.
Research Extracts
A 2025 animal study tested aqueous and aqueous-alcoholic soft extracts of A. reptans. Experimental doses included 25 mg/kg in a carbon-tetrachloride liver-injury model and 100 mg/kg in a carrageenan-edema model. Local extract application was also tested for bleeding time and wound healing. These were animal research doses and preparations, not human medicinal doses.
Children & Adolescents
No established pediatric medicinal dose has been demonstrated. Traditional use is not enough to create a reliable modern dose for children or adolescents.
Classical Formulations
No single standardized classical Common Bugle formula comparable to a named Ayurvedic or Chinese formula system was identified. European household practice generally used the herb itself in simple infusions, washes, poultice-type applications, or mixed folk preparations that varied by region and period.
Constituents
Reported constituents include iridoid glycosides such as harpagide, 8-O-acetylharpagide, and reptoside; phenylpropanoid glycosides including verbascoside, isoverbascoside, teupolioside, and martinoside; flavonoids; hydroxycinnamic acids; tannins; phytosterols; volatile compounds; fatty acids; and other phenolics.
Ajuga reptans is also notable for phytoecdysteroids, including 20-hydroxyecdysone and related compounds. These plant steroids are of particular interest in insect physiology and plant-defense research.
One important correction in the research record concerns 8-O-acetylharpagide. A 1996 study initially reported it as an ecdysteroid agonist, but a 2001 reinvestigation found that the apparent activity came from contaminating ecdysteroids and that purified 8-O-acetylharpagide itself did not show that agonist activity.
Modern Research
Wound Healing & Hemostatic Research
A 2025 experimental study found that locally applied A. reptans herb extracts reduced bleeding time in animals, with the strongest tested extract reducing bleeding time by about 40.6% compared with the control. In the same study, one tested extract produced complete wound closure by day 9 in the animal wound model.
These findings support the plant’s traditional wound-herb reputation but remain preclinical. They do not prove that homemade preparations are suitable for serious wounds or major bleeding.
Anti-Inflammatory & Hepatoprotective Research
The same study reported moderate anti-inflammatory effects in a carrageenan-edema model and hepatoprotective effects in an experimental carbon-tetrachloride liver-injury model. The aqueous-ethanolic extract was the strongest preparation for several measured outcomes.
These animal results do not establish Common Bugle as a human treatment for inflammatory disease or liver disease.
Antimicrobial Research
The 2025 study also reported inhibition of selected microorganisms, with stronger activity against Gram-positive bacteria. Other laboratory studies involving Ajuga-derived phenylpropanoid glycosides have examined wound-healing and anti-inflammatory mechanisms in cells and experimental models.
Human Evidence
Well-controlled human clinical evidence for Ajuga reptans remains inadequate. Modern evidence is dominated by phytochemistry, laboratory assays, plant-cell research, and animal studies.
Adverse Effects
Species-specific human adverse-effect data are limited. The 2025 animal study characterized its tested extracts as practically non-toxic under the experimental conditions, but this does not establish long-term human safety or a broad safe-dose range.
Individual sensitivity or contact reactions are possible with any botanical preparation. Concentrated extracts should not be assumed equivalent to traditional topical or household preparations.
Interactions & Contraindications
Reliable human drug-interaction data for A. reptans are lacking. Vitamin K1 was measured in modern phytochemical work, but no predictable human coagulation effect has been established from ordinary Common Bugle preparations.
Because the herb has traditional hemostatic associations and modern preclinical clotting-related research, people taking anticoagulant or antiplatelet medication should not use concentrated preparations specifically to alter bleeding or clotting without professional review.
Common Bugle should also not be substituted for Lycopus “bugleweed” in thyroid-related herbal practice.
Pregnancy & Breastfeeding
Reliable modern reproductive-safety data are insufficient. No evidence-based pregnancy or breastfeeding medicinal dose has been established, so concentrated or deliberate internal medicinal use cannot be considered proven safe during pregnancy or lactation.
Habitat & Cultivation
- Native range: Europe to northern Iran and northwestern Africa
- Growth habit: Spreading stoloniferous perennial groundcover
- Height: Commonly up to about 30 cm
- Light: Partial shade to sun where adequate moisture is available
- Soil: Moist but reasonably well-drained garden soil
- Garden behavior: Spreads quickly by runners and can become aggressive in favorable sites
The species is widely cultivated and has naturalized in many areas outside its native range, including parts of North America.
Propagation
Propagation is easy from rooted stolons, division of established mats, or seed. Because the plant spreads rapidly by runners, divisions are often the simplest way to establish or control a planting.
Harvesting & Drying
Traditional herbal use generally focuses on aerial material, especially the flowering herb. Harvest correctly identified, clean material away from contaminated ground.
Dry aerial portions in a thin layer with good airflow away from strong direct sunlight until thoroughly dry. Store in a labeled airtight container away from heat, moisture, and light.
Food Use
Kew records food use for A. reptans, but Common Bugle is not a major modern culinary herb and culinary practices are not well standardized. Medicinal extracts, ornamental cultivars, and ordinary food use should not be treated as interchangeable.
History, Folklore & Spiritual Use
Common Bugle has a long European reputation as a wound herb. Historical vernacular names such as “carpenter’s herb” reflect its association with cuts, bruises, and local bleeding in household practice.
Its dense creeping growth and persistent blue-violet flower spikes also made it familiar as both a wild herb and later a garden groundcover. Folkloric and symbolic uses vary by region and should remain clearly separated from pharmacologic claims.
Materia Medica Summary
Ajuga / Common Bugle (Ajuga reptans) is a stolon-forming Lamiaceae perennial native from Europe to northern Iran and northwestern Africa. Traditional European practice used the aerial herb mainly as an astringent wound herb.
Modern research confirms a chemically rich plant containing iridoids, phenylpropanoid glycosides, tannins, phenolics, phytosterols, and multiple phytoecdysteroids. A 2025 preclinical study reported local hemostatic and wound-healing effects, along with anti-inflammatory, hepatoprotective, and antimicrobial activity, but strong human clinical evidence and established modern oral dosing remain absent. Common Bugle should not be confused with Lycopus bugleweed.