DirtDiva, I was taking the megafood Cal, Mag +Pot for awhile and I can second that it is an excellent product. I just wish they were a little easier to swallow. lol. They are huge!
I'd like to edit my above comment on supplementing with calcium because its a very complicated issue. Megafoods Cal/Mag is awesome and I've used that before on long races to avoid cramping along with salt stick. Supplementing only with calcium is tricky and one needs the balancing act of Vit D, Mag & Potassium to go along. Then on top of the Vitamin D, Vitamin K2 is incredibly important. You read this from time to time that you shouldn't over due the Vitamin D because of poisoning, but that is a result of calcium not being directed properly. Vitamin D flushes out calcium into the blood which leads to other consequences.
What I'd like to say plainly is that too much calcium from poor sources deposits itself into the soft tissues of the body, namely the epithelial lining of the blood vessels and the heart. This also leads into the discussion of heart attacks, which is another topic that doctors don't want to talk about, they just want you on a statin. Cholesterol doesn't cause heart attacks, that is vastly simplified. There are enough women out there that have had mammograms and the docs say there is calcification in there and we have to remove it and biopsy that...I was one of those women and it nearly killed me (the stereotacticle needle punctured my lung and on the third pass it broke inside of me causing me to hemorrhage). The calcifications were biopsied, all of them calcium, no cancer.
I'd say that was the turning point for me to learn a lot about the junk that is peddled to us as women. Especially heaping amounts of calcium products like dolomite (lead) among other things. Not to mention bone density tests, don't get me started there.
Anyway, back to your original point (sigh, why can't I stay on topic)....I agree about the size. You have to make out like a great white shark and open up!