Shepherd's Purse comes from the Capsella bursa-pastoris plant. For centuries people have used the liquid extract or dried herb to slow bleeding from small cuts. Many also turn to it for heavy menstrual flow. Its traditional reputation is built around supporting the body's natural clotting response.
Be careful if you take blood thinners or anticlotting drugs. The herb's clotting actions might interfere with those medications. Pregnant women should steer clear. There is a possibility it could stimulate the uterus.