Can you link the 2019 JAMA study? When you say "massive doses of D" how large are you talking about? 

Thank you.  I'll run it by him on my next visit.  

Yes, Yaya, it is possible to develop vitamin D toxicity with overdosing since it is a fat soluble vitamin but the dosage needed to get to that point is much larger than was thought years ago. Years ago, doctors were very cautious about D supplementation but more recently the medical community has relaxed their caution as it proved to be overdone. Individual practitioners are not always up to date on everything and sometimes are operating on dated information.

Kitty, Be careful with massive transfusions of D, it's dangerous per my cardiologist.  Your note made me confirm and he's right.  I found this article called:  Too much vitamin D may harm bones, not help - Harvard Health The study was released on Dec 1, 2019 · and appeared in the Aug. 27 issue of JAMA which found that, compared with people who took moderate amounts of vitamin D, adults who took large amounts daily not only didn't see additional gains in bone density, but in some cases ended up worse off.  I especially must be careful because, like many Celiacs, I have low bone density.  I have been taking Prolia shots for about 5 years.   Also there is such a thing as vitamin D toxicity per my cardiologist.  That's why he carefully monitors my #s and wants me to raise levels slowly.   Take care.  

Oh, @Yaya! Five years???  How awful for you to suffer so long! My Vitamin D came up in a matter of months.  High dose Vitamin D has been used in the past to correct rickets and is a safe method to correct Vitamin D deficiency.   I took 1000 IU several times a day, every day for several weeks.  I ate them like m&m's when I was severely deficient.  My brain craved them.  I felt so much better afterwards.  On maintenance dose now.  Yes, the craving went away as my level reached 80-95.   Ask your cardiologist about supplementing with.Benfotiamine.