Blueberry is closely related to the European
bilberry(Vaccinium myrtillus). Several species of blueberries
exist—including V. pallidum and V. corymbosum—and grow
throughout the United States. Blueberry leaves are the primary part of the plant used
medicinally. However, the berries are occasionally used.
Blueberry has been used in
connection with the following conditions (refer to the individual
health concern for complete information):
Reliable
and relatively consistent scientific data showing a substantial health benefit. Contradictory, insufficient, or preliminary studies
suggesting a health benefit or minimal health benefit. For an herb, supported by traditional use but minimal
or no scientific evidence. For a supplement, little scientific support and/or minimal health
benefit.
Historical or traditional use (may
or may not be supported by scientific studies)
According to traditional herbal textbooks, a tea made from blueberry leaves was considered
helpful in diabetes, urinary tract infections, and poor
appetite.1 The berries were a prized commodity among the indigenous peoples of
North America.
Active constituents
Tannins make up as much as 10% of blueberry leaves. The astringent nature of tannins likely
accounts for the usefulness of blueberry leaf in treating diarrhea.2 The astringent effect may also
be soothing for sore throats.3Bilberry, blueberry’s European cousin, is
used primarily for maintaining blood vessels, particularly those in the eyes. Some preliminary
evidence indicates that anthocyanosides, the bioflavonoid complex common to bilberrry and
blueberry may help people with diabetes,
particularly if they have damage to the retina (retinopathy). However, these studies are primarily
based on a standardized extract from bilberry fruit.4
How much is usually taken?
A tea is prepared by combining 1 cup (250 ml) boiling water and 1–2 teaspoons
(5–10 grams) of dried leaves and steeping for 15 minutes. As many as 6 cups (1,500 ml)
each day may be taken for diarrhea and 3 cups (750 ml) each day for diabetes. Alternatively, 1
teaspoon (5 ml) of tincture can also be used three times per day.
Are there any side effects or interactions?
If the tea does not significantly reduce diarrhea within two to three days, consult with a
healthcare practitioner. Fresh (but not dried) berries tend to be laxative and should be
avoided in cases of diarrhea.5
At the time of writing, there were no well-known drug interactions
with blueberry.
References (To view, roll mouse over the "References" heading; to hide, click on the heading)
1. Tilford GL. Edible and Medicinal Plants of the West.
Missoula, MT: Mountain Press Publishing Company, 1997, 80–1.
2. Tyler V. Herbs of Choice: The Therapeutic Use of
Phytomedicinals. New York: Pharmaceutical Products Press, 1994, 52–4.
3. Schilcher H. Phytotherapy in Paediatrics. Stuttgart, Germany:
Medpharm Scientific Publishers, 1997, 126–7.
4. Passariello N, Bisesti V, Sgambato S. Influence of anthocyanosides on
the microcirculation and lipid picture in diabetic and dyslipic subjects. Gazz Med
Ital 1979;138:563–6.
5. Tyler V. Herbs of Choice: The Therapeutic Use of
Phytomedicinals. New York: Pharmaceutical Products Press, 1994, 52–4.
The information presented in Aisle7 is for informational purposes only.
It is based on scientific studies (human, animal, or in vitro), clinical experience,
or traditional usage as cited in each article. The results reported may not necessarily occur
in all individuals. For many of the conditions discussed, treatment with prescription or over
the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist
for any health problem and before using any supplements or before making any changes in
prescribed medications. Information expires February 2010.
Reliable
and relatively consistent scientific data showing a substantial health benefit.
Contradictory, insufficient, or preliminary studies
suggesting a health benefit or minimal health benefit.
