Bilberry

Last Editorial Review: 6/11/2021
Other Name(s):

Airelle, Arándano, Bilberry Fruit, Bilberry Leaf, Black Whortles, Bleaberry, Blueberry, Brimbelle, Burren Myrtle, Dwarf Bilberry, Dyeberry, European Bilberry, Feuille de Myrtille, Fruit de Myrtille, Gueule Noire, Huckleberry, Hurtleberry, Mauret, Myrtille, Myrtille Européenne, Myrtilli Fructus, Raisin des Bois, Swedish Bilberry, Trackleberry, Vaccinium myrtillus, Whortleberry, Wineberry.

Overview

Bilberry is a plant. The dried, ripe fruit and leaves are used to make medicine.

Bilberry is used for improving eyesight, including night vision. In fact, during World War II, British pilots in the Royal Air Force ate bilberry jam to improve their night vision, but later research showed it probably didn't help. Bilberry is also used for treating eye conditions such as cataracts and disorders of the retina. There is some evidence that bilberry may help retinal disorders.

Some people use bilberry for conditions of the heart and blood vessels including hardening of the arteries (atherosclerosis), varicose veins, decreased blood flow in the veins, and chest pain.

Bilberry is also used for chronic fatigue syndrome (CFS), hemorrhoids, diabetes, osteoarthritis, gout, skin infections, gastrointestinal (GI) disorders, kidney disease, and urinary tract infections (UTIs).

It is sometimes applied directly to the inside of the mouth for mild mouth and throat soreness.

How does work?

Bilberry contains chemicals called tannins that can help improve diarrhea, as well as mouth and throat irritation, by reducing swelling (inflammation). There is some evidence that the chemicals found in bilberry leaves can help lower blood sugar and cholesterol levels. Some researchers think that chemicals called flavonoids in bilberry leaf might also improve circulation in people with diabetes. Circulation problems can harm the retina of the eye.

QUESTION

Next to red peppers, you can get the most vitamin C from ________________. See Answer

Uses

Possibly Effective for...

  • Circulation problems (chronic venous insufficiency). Early research suggests that taking bilberry extract that contains 173 mg of certain chemicals, called anthocyanins, daily for 30 days reduces symptoms associated with a circulation problem called chronic venous insufficiency (CVI). Other research suggests that taking 100-480 mg of bilberry anthocyanins daily for up to 6 months might improve swelling, pain, bruising, and burning associated with CVI.
  • Problems with the retina of the eye in people with diabetes or high blood pressure (retinopathy). Eating bilberry fruit containing a high amount of a certain chemical, called anthocyanoside, seems to improve retina problems associated with diabetes or high blood pressure.

Possibly Ineffective for...

  • Improving night vision. There is contradictory evidence about the effectiveness of bilberry for improving night vision. However, most evidence to date suggests that bilberry is not effective for improving night vision.

Insufficient Evidence to Rate Effectiveness for...

More evidence is needed to rate the effectiveness of bilberry for these uses.

Side Effects

The dried, ripe fruit of bilberry is LIKELY SAFE for most people when eaten in typical food amounts.

Bilberry fruit extracts are POSSIBLY SAFE when taken by mouth for medicinal uses for up to one year. Also, a specific combination product (Mirtogenol) containing bilberry and French maritime pine bark (Pycnogenol) has been used safely for up to 6 months.

Bilberry leaf is POSSIBLY UNSAFE for most people when taken in high doses or for a long time.

Precautions

Pregnancy or breast-feeding: Not enough is known about the use of bilberry during pregnancy and breast-feeding. Stay on the safe side and avoid use.

Diabetes. Bilberry leaf might lower blood sugar. Taking bilberry leaves along with diabetes medications might cause your blood sugar to go too low. Monitor your blood sugar closely.

Surgery: Bilberry might affect blood glucose levels. This could interfere with blood sugar control during and after surgery. Stop taking bilberry at least two weeks before a scheduled surgery.

Interactions


Medications for diabetes (Antidiabetes drugs)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

Bilberry leaves might decrease blood sugar. Diabetes medications are also used to lower blood sugar. Taking bilberry leaves along with diabetes medications might cause your blood sugar to go too low. Monitor your blood sugar closely. The dose of your diabetes medication might need to be changed.

Some medications used for diabetes include glimepiride (Amaryl), glyburide (Diabeta, Glynase PresTab, Micronase), insulin, pioglitazone (Actos), rosiglitazone (Avandia), chlorpropamide (Diabinese), glipizide (Glucotrol), tolbutamide (Orinase), and others.


Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs)Interaction Rating: Moderate Be cautious with this combination.Talk with your health provider.

There is some concern that bilberry might slow blood clotting. Taking bilberry along with medications that also slow clotting might increase the chances of bruising and bleeding. However, there is not enough information to know if this is a serious concern.

Some medications that slow blood clotting include aspirin, clopidogrel (Plavix), diclofenac (Voltaren, Cataflam, others), ibuprofen (Advil, Motrin, others), naproxen (Anaprox, Naprosyn, others), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, warfarin (Coumadin), and others.

Dosing

The following doses have been studied in scientific research:

BY MOUTH:

  • The typical dose of the dried, ripe berries: 20-60 grams daily. People also drink a type of tea made from 5-10 grams (1-2 teaspoons) of the mashed berries.
  • A dose of 160 mg of bilberry extract taken twice daily has been used in people with diseased retinas.
  • A dose of 200 mg taken twice daily for four weeks has been used in patients with who have difficulty seeing far away.
  • Bilberry leaf is commonly used as a tea. The tea is prepared by steeping 1 gram, 1-2 teaspoons, finely chopped dried leaf in 150 mL boiling water for 5-10 minutes, and then straining. Don't use bilberry leaf long-term.

SLIDESHOW

Vitamin D Deficiency: How Much Vitamin D Is Enough? See Slideshow

Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, and Insufficient Evidence to Rate (detailed description of each of the ratings).

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