sunnyflower...that strontium will not have any effect...the body ignores strontium when calcium is available...the bodies' calcium receptor also senses strontium but always goes with calcium if it has the choice...that is why strontium users take strontium at night when there is little or no chance of any calcium product taking precedence over the strontium...so sorry you are taking calcium and the strontium you take with it is being eliminated thru your kidneys and not being used in your bones...this can be changed by just taking a strontium supplement at night...AOR makes a good one which is monitored by the great Canadian health care laws on supplements.ha or any strontium citrate will probably work...I just like the comfort of Canada looking over my shoulder