Web MD says this about it:
"...People use the juniper berry to make medicine. Medicinal preparations include the extract of juniper berry, as well as the essential oil of juniper berry. Don’t confuse juniper berry oil with cade oil, which is distilled from juniper wood (Juniperus oxycedrus).
Juniper is used for digestion problems including upset stomach, intestinal gas (flatulence), heartburn, bloating, and loss of appetite, as well as gastrointestinal (GI) infections and intestinal worms. It is also used for urinary tract infections (UTIs) and kidney and bladder stones. Other uses include treating snakebite, diabetes and cancer.
Some people apply juniper directly to the skin for wounds and for pain in joints and muscles. The essential oil of juniper is inhaled to treat bronchitis and numb pain...