Herbal Medicine - Alder Buckthorn
Herbal Medicine – Alder Buckthorn
Botanical Information
Alder Buckthorn (Rhamnus frangula), now more commonly classified as Frangula alnus, belongs to the Rhamnaceae family. It is a deciduous shrub or small tree that grows up to 6 metres tall. The plant features smooth grey-brown bark, oval green leaves with distinct veins, clusters of small greenish-white flowers, and berry-like fruits that change from green to red before ripening to glossy black.
Habitat and Cultivation
Alder Buckthorn is native to Europe, North Africa, and parts of Asia, where it naturally grows in damp woodlands, marshes, and along riverbanks. It prefers moist, slightly acidic soils and partial shade. For medicinal use, the bark is harvested during spring or early summer and must be aged for at least one year or heat-treated before use to reduce naturally irritating compounds.
Parts Used
The aged bark is the primary medicinal part used. The berries are generally not used medicinally because fresh fruits can be toxic.
Active Compounds
Alder Buckthorn contains anthraquinone glycosides (primarily frangulin and glucofrangulin), along with flavonoids, tannins, and emodin. These compounds are responsible for its stimulant laxative and digestive effects.
Traditional Uses
Throughout European folk medicine, aged Alder Buckthorn bark has long been valued as a gentle stimulant laxative for relieving occasional constipation and promoting bowel regularity. It was also traditionally used to support liver function, stimulate bile flow, and “purify the blood.” In Russia and parts of Eastern Europe, herbal practitioners used it to help manage skin eruptions believed to result from poor digestion and inadequate elimination. Although its berries were rarely used medicinally because of their toxicity, they were historically valued as a natural source of yellow and green dyes.
Evidence-Based Health Benefits
Modern scientific evidence confirms that properly processed Alder Buckthorn acts as an effective stimulant laxative, increasing intestinal contractions (peristalsis) to relieve occasional constipation. Traditional use also suggests mild cholagogue activity, helping to stimulate bile production and support digestion. Historically, improved elimination has also been associated with healthier skin, although clinical evidence for this effect remains limited.
Common Preparations
Alder Buckthorn is most commonly prepared as a decoction or herbal tea using properly aged bark. It is also available as alcohol-based tinctures, standardized capsules, and powdered extracts formulated to provide controlled amounts of anthraquinone compounds. Fresh bark should never be used medicinally.
Safety and Precautions
Fresh bark and unripe berries are toxic and may cause severe vomiting, abdominal pain, and diarrhoea. Even properly aged bark should only be used occasionally and under professional guidance, as prolonged use may lead to laxative dependence, electrolyte imbalance, and reduced normal bowel function. Alder Buckthorn is contraindicated during pregnancy and breastfeeding, in children, and in individuals with intestinal obstruction, inflammatory bowel disease, appendicitis, or severe dehydration.
Cultural Significance
In European folklore, Alder Buckthorn was regarded as a protective shrub believed to ward off witches, evil spirits, and negative influences when planted near homes and farms. Its bark was historically used to produce natural dyes, while its charcoal became highly prized in the manufacture of traditional gunpowder. Folk healers viewed the plant as a symbol of purification, believing it could cleanse both the body and negative energies.
Current Research
Current pharmacological research confirms the laxative action of Alder Buckthorn’s anthraquinone glycosides, which work similarly to those found in senna and cascara. Modern studies emphasize the importance of proper bark aging or processing to reduce gastrointestinal irritation. Ongoing research focuses on developing standardized extracts that provide safer, more predictable therapeutic effects while minimizing adverse reactions.
