Cranberry (Vaccinium macrocarpon) fruits and leaves have a long history of traditional use in folk medicine for the management of diverse conditions including urinary problems, wounds, stomach problems, diabetes, etc. Over the last decades popular interest in the use of cranberry for the prevention and treatment of urinary tract infections (UTI) has been on the rise.
Recent clinical study was done to evaluate the anti-microbial effect in urine specimens after ingestion of commercially available cranberry product in volunteer subjects.
Ref: http://ecam.oxfordjournals.org/cgi/content/full/nem183