Hi Maddog,
Sorry to confuse you. I take calcium, magnesium, and vitamin D for osteoporosis, because i have trouble taking osteoporosis meds. I have AS too, and I'm already fused, but the fusing led to Osteoporosis, because it drew the minerals out of my bones, and I'm low on magnesium and vitamin D, so it's my job to try to put all it back where it belongs (so to speak).
I don't know how it works, but from what I have heard, calcium, if taken properly and not excessively, is supposed to get placed into the bones, not into the calcification from the fusing. My best guess for that would be because bones contain the other minerals to draw the calcium into them, but the calcification doesn't. Don't take my word for it though, I'm just guessing at this point. I'm also doing this by the orders of my doctors too.
Welcome to kickas.org by the way.

Take care,
James