Here's a timely reference on the subject of calcium,
http://www.westonaprice.org/basicnut...ralprimer.html
I reccomend reading what it has to say on the other minerals such as magnesium, cloride etc. because they all work together.
Regards, Anthony
EDIT: OK, I forgot to add that I make my own bone broths (stock) that I have every day. It's nice in soups or just add a little to whatever savory meat, vegetable dish your cooking for a wonderful flavor. Its very rich in minerals and I reccomend it as an excelent alternative to dairy which is what the origional question was.