Juniper (Juniperus communis): Properties and Benefits

Juniperus communis L. / Juniper, known in English as juniper or common juniper and also called dwarf juniper or ground juniper, is an evergreen conifer of the Cupressaceae family described by Carl Linnaeus. Native to a vast circumpolar range across the Northern Hemisphere, the species has adapted to very different climates and altitudes and shows remarkable morphological variability, growing either as a low, creeping shrub or as a small tree. Juniper has been used for millennia in traditional medicine and in cooking, and the part most prized for its aroma and medicinal uses is the ripe pseudo-berry, the fleshy galbulus everyone knows as the juniper berry.

In the European herbal tradition, juniper holds a prominent place as a diuretic and antiseptic, with recorded uses ranging from gastrointestinal complaints to the relief of inflammation. Its phytochemical makeup is rich, above all in essential oil, and it is to this composition that the properties described by tradition are attributed. Modern scientific research has been investigating several of these uses, largely in laboratory and animal studies, which explains the worldwide interest in the plant but does not yet replace confirmation in clinical trials in people.

Popular and International Names of Juniper#

• English: common juniper, dwarf juniper, ground juniper, juniper, mountain juniper, wild juniper.
• French: echinèbre, genévrier commun, genibre, genièvre, gnèbre, jébré, jimbou, jimbre, nébré, peteron, petrot, piket, yembro.
• German: Dürrenstaude, Feuerbaum, Gemeiner Wacholder, Gewöhnlicher Wacholder, Heidewacholder, Krammetsbeerbaum, Krammetsbeerstrauch, Kranawettstrauch, Kranawitt, Kraunbaum, Reckolder.
• Italian: ginepro comune, ginepro nano.
• Portuguese: fruto-de-genebra, genebra, genebreiro, junípero, junipo, xenebro comum, zimbrão, zimbro, zimbro-anão, zimbro-comum.
• Spanish: azotacristos, enebro, enebro común, enebro real, xinebro.

In Brazil, zimbro and junípero are used side by side, both for the plant and for the berries sold as a spice, but zimbro is by far the most widely used name and the one readers search for most.

Botanical Synonyms of Juniperus communis#

Juniperus borealis Salisb., Juniperus canadensis Lodd. ex Burgsd., Juniperus communis subsp. alpina (Suter) Čelak., Juniperus communis subsp. nana (Willd.) Syme, Juniperus communis var. depressa Pursh, Juniperus communis var. montana Ait., Juniperus communis var. saxatilis Pallas, Juniperus depressa (Pursh) Raf., Juniperus nana Willd., Juniperus sibirica Burgsd.

Many of these names correspond to the dwarf, prostrate and mountain varieties and subspecies described over time within Juniperus communis. None of them, however, refers to savin (Juniperus sabina), a toxic, abortifacient species whose branches have been used in the past to adulterate juniper, nor to cade (Juniperus oxycedrus), the source of cade oil, which is for topical use, and for this reason purchases should be limited to correctly identified Juniperus communis berries.

Botanical Family: Cupressaceae#

The Cupressaceae family, known as the cypress family, brings together evergreen conifers, both trees and shrubs, widely distributed around the world and adapted to very diverse ecosystems. Its plants are valued for their timber, their essential oils and, in many cases, their medicinal uses, and juniper, with its aromatic berries, is one of the best-known examples of the group’s economic and cultural importance.

The species Juniperus communis shares traits typical of the family, such as evergreen foliage, which in juniper is needle-shaped, and reproductive structures borne in cones, with one feature peculiar to the genus Juniperus: the female cone has fleshy, fused scales that look like a berry, hence the common name juniper berry. Chemical diversity within the Cupressaceae is broad, with many species producing bioactive compounds such as terpenes and flavonoids, which helps explain the traditional use of several plants in the family in folk medicine and phytotherapy.

Parts of Juniper Used#

• Aerial parts (leaves and twigs)
• Bark
• Berries (ripe pseudo-berries or galbuli, the fleshy female cones)
• Essential oil

The part with an established medicinal use is the ripe pseudo-berry (galbulus), harvested once it has turned dark blue and then dried for use as a spice and in home preparations. Bark, leaves and twigs appear in ethnobotanical records and in laboratory research, but they lack the same tradition of internal use, while the essential oil, being highly concentrated, is restricted to external use and always diluted.

Ethnobotanical and Traditional Uses#

The list below brings together historical and ethnobotanical records, that is, what different peoples and old texts have reported about the plant, not proven indications. Older sources even cited juniper for albuminuria, chronic pyelonephritis, renal suppression and nephritic dropsy in children, as well as childhood tuberculosis, applications that should not be repeated, since the plant itself can irritate the kidneys and there are no safety data for use in children.

• Abdominal disorders
• Amenorrhea
• Anti-inflammatory
• Arthritis
• Asthma
• Bladder ailments
• Bladder catarrh
• Carminative
• Cough
• Cystitis (acute and chronic)
• Diabetes
• Diaphoretic
• Digestive disorders
• Diuretic
• Emmenagogue
• Gastrointestinal problems
• Gout
• Hemorrhoids
• Inflammation
• Intestinal colic
• Leukorrhea
• Migraine
• Pulmonary blennorrhea
• Respiratory ailments
• Urinary antiseptic

Therapeutic Properties of Juniper#

The properties below combine traditional records with activities observed in laboratory and animal studies, and few of them have been evaluated in clinical trials in people, so none of them replaces follow-up by a healthcare professional.

• Antibacterial (activity against bacteria observed in laboratory tests)
• Anti-inflammatory (reduction of inflammation observed in experimental models)
• Antimicrobial (action on various microorganisms in laboratory assays)
• Antioxidant (neutralizes free radicals in laboratory assays)
• Antiproliferative (activity observed in laboratory studies, without clinical proof)
• Antiseptic (traditional record of use against germs, especially in the urinary tract)
• Antiviral (activity observed in vitro, without confirmation in humans)
• Carminative (traditional record of relief from intestinal gas)
• Diaphoretic (traditional record of stimulating perspiration)
• Diuretic (increases urine volume, the central effect in traditional use)
• Emmenagogue (stimulates menstrual flow, the reason for the contraindication in pregnancy)
• Hepatoprotective (liver protection observed in animal studies)
• Hypoglycemic (reduction of blood glucose observed in preclinical studies)
• Hypolipidemic (reduction of blood fats observed in animal studies)
• Neuroprotective (protection of the nervous system investigated in experimental studies)

Detailed Phytochemical Profile of Juniper#

• Alkaloids
• α-Cadinol
• Catechin
• Coumarins
• Essential oils
• Flavonoids
• Germacrene D
• Gums
• α-Humulene
• Invert sugars
• Leucoanthocyanidins
• Limonene
• β-Myrcene
• Organic acids
• α-Pinene
• β-Pinene
• Resins
• Sabinene
• Tannins
• Terpene acids
• Terpinen-4-ol
• α-Terpineol

The essential oil of the berries holds most of the monoterpenes, such as α-pinene, sabinene, β-myrcene and limonene, which are responsible for the resinous aroma, while tannins, flavonoids and catechin appear in the non-volatile fractions studied for their antioxidant activity.

Preparation and Administration Forms of Juniper#

• Capsules/Tablets (standardized extracts)
• Essential oil (diluted topical use and aromatherapy only, never by mouth)
• Fluid extract
• Infusion (tea)
• Tincture

For any form of internal use, traditional records and the German Commission E limit use to periods of up to 4 to 6 weeks, and the dose should be set by a healthcare professional, who will take kidney function and current medications into account. Gin, although flavored with juniper berries, is an alcoholic beverage and not a medicinal form of the plant.

Synergy with Other Medicinal Plants#

Traditional Combinations with Horsetail, Nettle, Turmeric and Ginger

Research specifically on juniper synergies is still limited, and the combinations described here come from traditional records, based on the diuretic and anti-inflammatory properties attributed to the plant. Tradition pairs juniper with horsetail (Equisetum arvense) and nettle (Urtica dioica) in blends used to stimulate diuresis, and with turmeric (Curcuma longa) or ginger (Zingiber officinale) when the traditional aim is relief of pain and inflammation. Because combining diuretic plants also adds up their effects, these combinations should respect the same time limit as juniper alone and always be guided by a healthcare professional.

Recipes and Usage Protocols of Juniper#

Juniper Berry Infusion for Urinary and Digestive Health

Ingredients: a small amount of dried, lightly crushed juniper berries, in a proportion set with a healthcare professional, and one cup of boiling water.

Preparation: Place the berries in a cup, pour the boiling water over them, cover and let steep for 10 to 15 minutes before straining. This infusion is traditionally used to support digestion and diuresis and to ease mild gastrointestinal discomfort, and how often to drink it should be guided by a healthcare professional, without exceeding the traditional limit of 4 to 6 weeks and never in cases of kidney disease, pregnancy or breastfeeding. Consult a healthcare professional before use.

Diluted Juniper Massage Oil

Ingredients: 2 to 3 drops of juniper essential oil and 10 ml of a carrier vegetable oil, such as sweet almond or jojoba oil.

Preparation: Mix the essential oil with the vegetable oil in a dark glass bottle and apply to clean skin, gently massaging areas with muscle aches, tension or joint discomfort, a use traditionally recorded to ease localized discomfort. Do a patch test on a small area of skin first, avoid direct sun exposure after application and never use the oil undiluted or by mouth.

Juniper Tincture for Internal Use

Ingredients: standardized juniper tincture, available in health food stores or compounding pharmacies.

Preparation: Dose and frequency should follow the guidance of a qualified healthcare professional, and the tincture is usually diluted in water before taking. This more concentrated form is traditionally used for the diuretic and antiseptic properties attributed to juniper, especially in mild urinary tract complaints, and therefore calls for even closer attention to the 4 to 6 week limit and to the kidney contraindications. Consult a healthcare professional.

The preparations above follow traditional records and do not replace professional guidance. Before any internal use, check the contraindications and interactions described in this article.

Associated Therapies#

Aromatherapy

In aromatherapy, juniper essential oil is valued for a profile considered purifying and invigorating, and inhaling it through diffusers or vaporizers is traditionally associated with a sense of mental clarity and with relief from stress and fatigue. Diluted in vegetable oils, it is used in massages for muscle and joint aches, a practice linked in tradition to the idea of cleansing the body, and its fresh, woody fragrance is also used to create spaces for meditation and focus, always bearing in mind that the essential oil must not be swallowed.

Clinical Phytotherapy

In clinical phytotherapy, juniper appears in standardized extracts and capsules, with recorded use as a diuretic in urinary tract complaints such as cystitis and as an anti-inflammatory in rheumatic pain. There are also records of use for kidney stones, but these conditions require a medical diagnosis, and any sign of kidney inflammation or disease contraindicates the plant. The dose, the form of administration and the duration, which according to tradition and the Commission E does not exceed 4 to 6 weeks, are adjusted by the professional according to the patient’s condition and possible drug interactions.

Contraindications and Side Effects of Juniper#

General Contraindications

The part of juniper used is the ripe pseudo-berry (galbulus), and its internal use should be limited in time, as traditional records and the Commission E indicate a maximum of 4 to 6 consecutive weeks. Juniper is contraindicated in kidney disease or inflammation, since prolonged use or high doses can cause kidney irritation, and it is contraindicated in pregnancy, given records of uterine action, and during breastfeeding. It should also be avoided by people with a known allergy to plants of the Cupressaceae family, and since there are insufficient safety data for children, internal use in this age group is not recommended without medical guidance. People with clotting disorders or who are taking anticoagulants need to be cautious, as the coumarins present in the plant may enhance the effect of these medications.

Similar Species and Risk of Confusion

Juniper should not be confused with savin (Juniperus sabina), a toxic, abortifacient species whose branches have been used as an adulterant, which is why the recommendation is to buy only berries identified as Juniperus communis, from a known source. Nor should it be confused with cade (Juniperus oxycedrus), the source of cade oil, which is for topical use only.

Common Side Effects

When used under guidance and for a short time, juniper’s side effects tend to be rare and mild, although some people report nausea, vomiting or allergic skin reactions after drinking infusions. Undiluted essential oil, on the other hand, can cause skin irritation and sensitization, especially on sensitive skin, so the dilution and dosage guidance given by a professional should be followed to the letter.

Drug Interactions

Juniper can interact with several medications: with diuretics and antihypertensives, its diuretic effect adds to that of the drugs and increases the risk of electrolyte imbalances and an excessive drop in blood pressure, and with anticoagulants such as warfarin it may raise the risk of bleeding. Combining it with benzodiazepines or other sedatives may enhance central nervous system depression, with excessive drowsiness, and people taking antidiabetic drugs should be cautious and monitor their blood glucose closely, because preclinical studies have observed a hypoglycemic effect. Before starting to use juniper, always consult a healthcare professional, especially if you are taking other medications.

Historical Notes and Interesting Facts#

Juniper has the widest geographic distribution of any conifer, extending across the entire cold-temperate Northern Hemisphere. The name of the drink gin comes from the Dutch jenever, related to the French genièvre and the Latin juniperus, and in Dutch the berry itself is called jeneverbes, but gin remains an alcoholic beverage, not a medicinal form of the plant.

In the Middle Ages, juniper berries were burned to ward off evil spirits and, according to the beliefs of the time, to protect against disease, and they were also part of purification rituals. Ethnobotanical records also attribute to Indigenous peoples of North America the use of the plant as a female contraceptive, a finding that reinforces caution about its uterine action. In the kitchen, the berries are a versatile ingredient for seasoning game meats, sauces and marinades, with a resinous, slightly peppery flavor, and the aromatic wood was traditionally used for smoking food and in crafts.

Frequently Asked Questions about Juniper#