Hi @Cate64, it is amazing that through the "same" or "similar" treatment, that our bodies all do their own crazy stuff. I have been taking calcium/vitamin D tablets for several years now - early bc diagnosis in 2003.
Within 3 months of having the xgeva injections, my calcium levels plummeted. So much so that whilst I was in hospital I was prescribed 6 of those huge pills per day. As my levels improved, they were reduced to 4 daily, and now I take 2 per day. All under the supervision of my oncologist.
Possibly your calcium levels are good - not simply because of the supplements - but more your active lifestyle !
More power to you for it.
Regards, Sheryl