In general, vitamins and minerals, or any other nutrients found in food, don't need to be tapered when starting or stopping a supplement, because they vary so much with meals, anyway, that the body will automatically accommodate them at any reasonable level. Therefore, we can start or stop, or increase or decrease a dose at any time without any need to taper, unless we we're talking about megadoses. Normally, about the only thing that has to be tapered, is a treatment dose involving corticosteroids, because if not properly tapered, a corticosteroid can severely limit the functioning of our adrenals, which can upset our body's normal cortisol production.
Yes, we need to take vitamin D3, because adequate vitamin D is necessary in order to properly absorb the calcium in our food. And adequate magnesium is necessary in order to activate the vitamin D so that it can assist in the absorption of calcium.
As long as your eGFR is within the normal range, you should have no worries about taking magnesium, because your kidneys are functioning well. If your eGFR is below the normal range, it may be a good idea to ask your urologist for his or her opinion on taking magnesium supplements. Please don't be alarmed if any of your exams show abnormal growths on your kidneys, unless you're advised otherwise, by your doctor.
Years ago, when I had a chronic magnesium deficiency, and undertreated hypothyroidism, which led to an arrhythmia, that combination also tanked my eGFR, so that it was about half the normal value. Consequently, my GP sent me for an ultrasound scan of my kidneys, which revealed a relatively large cyst on my right kidney. When I asked, my Doctor told me not to worry about it, and although that was many years ago, I've never had any problems with it. And since I got my magnesium reserves restored, and take magnesium daily, and my thyroid treatment dose was doubled, I've had no further problems with my eGFR, arrhythmias, or anything else.
Treese wrote:Could any of that be caused by a deficiency in Magnesium, Vit D3 or Calcium?
That's a tough question. I'm not aware that any of those deficiencies could cause a problem with blood in the urine, but I'm not a urologist. In the body, magnesium, vitamin D, and calcium are integrally involved in many, many chemical reactions, and in many intracellular actions that occur continuously, to keep our body in operation, and although many of their functions are understood, surely, many more, are not.
Sorry that I couldn't be more helpful.
Tex