I took Mag Citrate, never figured out the right dose for Natural Calm. I was trying to take more (because the dose I was at didn't work), but the taste was getting terrible and I cound NOT stand it. It was not going to happen -- taking something I absolutely HATE in a larger concentration for a long time, so I just dropped the natural calm in favor of the generic thing that I actually could stand the taste of.
Sorry can't be of any help for Natural Calm. They have dosage guidelines on the container, though.