Test tube studies have shown that the berries can inhibit prostaglandin synthesis which indicates that this traditional use has some merit.
Juniper has diuretic and antiseptic properties which explain its uses as an herbal remedy for urinary tract infections such as cystitis and urethritis.
Modern studies on juniper indicate that it increases the filtration rate of the kidneys, dilutes the urine and disinfects the urinary tract.
Other traditional medical uses for juniper berries are the treatment of intestinal infections, colic and other stomach upsets.
In the German Pharmacopoeia the berries are listed as a treatment for dyspeptic complaints such as gas, heartburn, indigestion and flatulence.
The herb has been used topically as a treatment for wounds, muscle aches, lesions and abnormal skin growths, and snake bites.
It has been used as a remedy for delayed menstruation because it is thought to stimulate the uterine muscle.
In laboratory conditions, the antiviral compounds have been found to inhibit the growth of a number of virus strains including herpes and flu strains. The ingredient podophyllotoxin may also inhibit abnormal cell growths.
Juniper has antiseptic and astringent properties which explain why it has been used to treat acne and other skin blemishes.
It has also been used in combination with other herbs to treat psoriasis affecting the scalp.
It was shown to lower blood pressure by an average of 27% in rats and its ability to inhibit the formation of blood clots is being investigated.
Other studies show that berries can lower blood sugar in experimentally induced diabetes. No human trials have been made and further studies are needed to confirm this use for diabetes
This herb does have some disinfectant properties and may act as a natural insecticide.
It is probably best known for giving the alcoholic beverage gin its distinctive flavor. The berries are also used as a flavoring in pickling brine, stuffing, and for game meats, ham, and pork.
Juniper has a place in folklore. In Europe, the berries were burned for the last three days in April as a cleansing ritual and protection against sorcery.
It was also believed that if it was planted beside the main door it would prevent a witch to enter if she could not count all the needles correctly.
It is mentioned in the Bible as the tree that the Prophet Elijah hid under when he was fleeing from Queen Jezebel.