Hi Rick,

You need a total of 1000mg calcium, so if you double your dose, you'll be fine.

I can't claim to fully understand the ins and outs of how they obtain their calcium, but generally you need the "elemental" calcium, and I'm assuming your bottle says something like 530mg elemental calcium and 265mg elemental magnesium.

I remember getting caught early on by this. I had a bottle that said "Calcium 250, magnesium 125," and I thought great, just what I need. It was only when I was wondering why i was still getting occasional cramps and read the label more closely that I saw I was only getting 100 mg calcium with each dose, not 250!

Cheers.

Rosebud