I started taking a high doses of D a couple years ago and now have three rather large kidney stones (one 13cm x 8cm). Has anyone had this experience? FYI I take 50,000 6 days a week and my D level is 65. (I've had resections for crohns so I dont absorb everything).
Excessive vitamin D supplementation may increase the risk of stone formation by increasing the intestinal absorption of calcium, but there is no evidence that correction of vitamin D deficiency increases the risk of stone formation. http://content.karger.com/ProdukteDB/produkte.asp?Aktion=ShowPDF&ArtikelNr=000317196&Ausgabe=254382&ProduktNr=228539&filename=000317196.pdf