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Blueberry
Botanical name: Vaccinium spp.
© Steven Foster
Parts used and where grown
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):
| Science Ratings | Health Concerns |
|---|---|
 |
Common cold/sore throat Diarrhea Urinary tract infection |
 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.3 Bilberry, 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
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Copyright © 2007 Healthnotes, Inc. All rights reserved. www.healthnotes.com
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The information presented in Healthnotes 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 September 2008.