Blackberry

The 19th century American Eclectic physicians recommended a preparation made from the fruit as "an excellent syrup which is of most service in dysentery, being pleasant to the taste, mitigating the sufferings of the patient, and ultimately effecting a cure." They also recommended blackberry leaves for gonorrhea, vaginal discharges, recovery from childbirth and cholera. The few contemporary herbalists who discuss blackberry at all recommend it as an astringent for diarrhea.

Blackberry's high tannin content makes it quite astringent and supports its traditional use as a treatment for diarrhea and dysentery.

Tannin's astringent action helps constrict blood vessels and stop minor bleeding. This action would tend to explain the traditional external use of the herb to treat wounds.

One animal study shows that a strong infusion of blackberry leaves reduces blood sugar levels in diabetic rabbits, suggesting possible value in the management o diabetes.

Research has shown that blackberry's close relative, raspberry, relaxes the uterus.  Women might try blackberry for painful menstrual cramps.