Your body can only handle 500 mg of calcium at a time. If you can find a 500 mg tablet, it would be just as good as a 600 mg. The recommendation is to take two a day at different times.

I had a pharmacist call me From Kaiser telling me that I was taking the wrong calcium and needed to take calcium citrate because it was more effective and wasn’t countered by some of the dietary and medical things I was doing.

It appears that calcium citrate is sold a little deceptively. With the calcium you get it at Costco or other places that isn’t citrate you only need to take one pill twice a day. I’ve yet to find a calcium citrate that didn’t require you to take two pills twice a day To get 500 mg each time.