Juniper
Botanical name: Juniperus communis
© Steven Foster
Parts used and where grown
Juniper, an evergreen tree, grows mainly in the plains regions of Europe as well as in other parts of the world. The medicinal portions of the plant are referred to as berries, but they are actually dark blue-black scales from the cones of the tree. Unlike other pine cones, the juniper cones are fleshy and soft.
Juniper has been used in connection with the following conditions (refer to the individual health concern for complete information):
| Science Ratings | Health Concerns |
|---|---|
 |
Edema (water retention) Indigestion 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)
Aside from being used as the flavoring agent in gin, juniper trees have contributed to the making of everything from soap to perfume.1 Many conditions have been treated in traditional herbal medicine with juniper berries, including gout, warts and skin growths, cancer, upset stomach, and various urinary tract and kidney diseases.
Active constituents
The volatile oils, particularly terpinen-4-ol, may cause an increase in urine volume.2 According to some sources, juniper increases urine volume without a loss of electrolytes such as potassium.3 Juniper contains bitter substances, at least partly accounting for its traditional use in digestive upset and related problems.
How much is usually taken?
The German Commission E monograph suggests 1/2–2 teaspoons of the dried fruit daily.4 To make a tea, 1 cup (250 ml) of boiling water is added to 1 teaspoon (5 grams) of juniper berries and allowed to steep for twenty minutes in a tightly covered container. Drink one cup (250 ml) each morning and night. Juniper is often combined with other diuretic and anti-microbial herbs. As a capsule or tablet, 1–2 grams can be taken three times per day, or 1/4–1/2 teaspoon (1–2 ml) of tincture can be taken three times daily.
Are there any side effects or interactions?
Excessive applications (greater than the amounts listed above) may cause kidney irritation. People with either acute or chronic inflammation of the kidneys or kidney failure should not use juniper. Juniper should not be taken for greater than four weeks without first consulting a healthcare professional. One report suggests that people with diabetes should use juniper cautiously as it may raise glucose levels.5
Application of the volatile oil directly to skin can cause a rash. Pregnant women should avoid juniper until further information is available, as it may cause uterine contractions.
Are there any drug
interactions?
Certain medicines may interact with juniper. Refer to drug interactions for a list of those medicines.
References
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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.