Herbal Plant with Red Fruit

I still have not found the name of this shrub plant which bears a lot of near round fruits. It is a traditional herbal plant. 
My third uncle said by boiling the fruits and drank it, it would help to reduce high blood pressure and cooled the body. He planted it many years ago. He and my auntie have no blood pressure problem even though my auntie is quite big size. She could not walk properly due to ankle problem. My uncle is 73 years old and is very fit, living in the countryside 5km from my farm. He asked me to plant it. Why not?