your son in law is a doctor and suggested you to use
stalin! read about stalin , lots of side effect from many users. Why he suggested you to take that? does he mention any natural products instead? Go to amazon and check for the natural products or read the rating from the consumers to the seller.
that is all I can share.
change your diet, loose some weight, regular walking, yoga, taichi, eat less red meat, replacing with fishes and less intake sugar , candies...
good luck!