I have always had trouble sleeping and a stomach like a leather bucket. This means that it is not as active as it perhaps should be.
I had always heard about magnesium and calcium supplements but never tried them until a couple of years ago. The magnesium and calcium combination did not work for me but the one above is my holy grail.
I sleep way better and digestively, things could not be better. I am never ever without them. My favourite supplement brand is Solgar, which I have been using since before I left South Africa.