That’s not something I’ve ever heard of and I couldn’t find any research that indicates that taking calcium supplements can decrease your calcium levels.

I aim for 1200 mg per day from food and supplementing if I don’t get there. Most days I am very close, so I take one pill (250 mg of calcium citrate) to ensure I hit 250 mg. I used to take much more but have cut back.

I saw an MD specialist. She had no problems with dairy calcium. In fact, she said she preferred food calcium to supplement calcium, but calcium regardless. My MD specialist thought it dangerous for me to wear weights on my back, as I have osteo in my spine. Vit D is a yes, weight-bearing exercise, various ones, is a yes. Medication is a yes. My understanding is that once on the osteo slope, all you can do is slow, or if lucky stop, the decline. And of course, falling down is out of the question, so activities or weather with that risk needs to be approached with caution. I am on medication too, BTW. Go to the good sources of information rather than random advice.