Plant Monograph Template

Name of plant:
Bilberry

Catch phrase (Carmina Gadelica or traditional invocation if available):
No known invocation from the Carmina Gadelica is specifically associated with Bilberry. Throughout the British Isles and Scandinavia, however, bilberries were treasured as one of the wild fruits of summer, gathered from moors, mountains, and forest edges as both food and medicine.

Family:
Ericaceae (Heath Family)

Genus and species:
Vaccinium myrtillus

Other names:
Bilberry, European Blueberry, Whortleberry, Blaeberry, Hurtleberry, Huckleberry (regional), Fraughan (Irish)

Brief introduction:
Bilberry is a small deciduous shrub native to Europe and northern Asia. Closely related to the North American blueberry, it produces dark blue-black berries rich in anthocyanins and other antioxidants. Both the berries and leaves have a long history of medicinal use, particularly for circulatory and ocular health.

Traditional uses:

• Diarrhea

• Digestive complaints

• Scurvy prevention

• Vision support

• Circulatory disorders

• Urinary complaints

• General nourishment

The dried berries were especially valued as an astringent remedy for diarrhea.

Historical use:
Bilberries have been gathered throughout Europe for centuries as both food and medicine. During World War II, stories emerged that British pilots consumed bilberry jam to improve night vision, though the extent of this practice remains debated. The berries became a focus of scientific interest during the twentieth century because of their high anthocyanin content and potential vascular benefits.

Parts used and method of use:
Medicinal parts:

• Fruit (fresh or dried)

• Leaves (less commonly)

Preparations:

• Fresh berries

• Dried berries

• Infusion

• Decoction

• Extracts

• Capsules

• Syrups

• Jams and preserves

Modern medicinal products generally utilize concentrated berry extracts.

Use in healing (modern herbal practice):
Modern herbalists may use bilberry for:

• Antioxidant support

• Vascular health

• Capillary integrity

• Eye health support

• Digestive complaints

• General nutritional supplementation

Bilberry remains one of the most widely used herbal supplements for circulatory and ocular wellness.

Pharmacology and biochemistry:
Principal constituents:

• Anthocyanins

• Flavonoids

• Tannins

• Phenolic acids

• Quercetin

• Vitamin C

• Pectins

Actions:

• Antioxidant

• Vasoprotective

• Astringent

• Anti-inflammatory

• Microcirculatory support

Anthocyanins are considered the primary bioactive compounds responsible for many of bilberry's modern applications.

Common dosage:

Dried berries:

• 20–60 g daily

Standardized extract:

• 80–320 mg daily (typically standardized for anthocyanin content)

Infusion or decoction:

• 1–2 teaspoons dried berries per cup

Dosage varies according to preparation and intended use.

Safety factors (including side effects):

Generally regarded as very safe.

Possible side effects:

• Mild digestive upset

• Rare allergic reactions

Excessive consumption of leaf preparations is not recommended due to concerns regarding prolonged use and potential toxicity.

First aid / adverse reaction response:

For mild digestive upset:

• Reduce dosage or discontinue use

For allergic reactions:

• Discontinue immediately

• Seek medical attention if symptoms worsen

Serious adverse reactions are uncommon.

Drug interactions:

Potential concerns include:

• Anticoagulant medications

• Antiplatelet medications

• Antidiabetic medications

Most interactions are theoretical or based on constituent activity rather than well-established clinical evidence.

Horticultural requirements:

• USDA / Canadian zone: 3–8

• Soil pH: 4.0–5.5

• Light requirements: Full sun to partial shade

• Moisture: Moist, well-drained acidic soil

• Other notes (growth habit, harvest timing, etc.):
  Low-growing deciduous shrub reaching 15–60 cm in height. Prefers acidic woodland and heathland soils. Produces berries in midsummer. Difficult to cultivate in alkaline soils. In Canada, it grows best under conditions similar to those preferred by blueberries. Fruit is harvested when fully ripe and dark blue-black.

Sampling of clinical reports / studies:

• Numerous studies have investigated bilberry anthocyanins and their effects on vascular function.

• Research supports antioxidant activity and protection of capillary integrity.

• Clinical studies suggest benefits for certain circulatory conditions, though evidence varies in quality.

• Research into eye health has shown mixed results; some studies suggest support for visual fatigue and retinal function, while others find limited benefit.

• Laboratory studies demonstrate anti-inflammatory and antioxidant effects.

• Bilberry remains one of the most extensively studied berry-based herbal supplements.

Apothecary Records Note:
Bilberry occupies a place similar to that of blueberry in North America but has a considerably longer medicinal reputation. Historically prized as both food and medicine, it is now valued primarily for its anthocyanin-rich berries and their effects on circulation and antioxidant support. In the Celtic regions of Scotland and Ireland, bilberries (blaeberries) were a familiar wild harvest and remain deeply embedded in local food traditions.