Second, Warfarin, a vitamin K inhibitor, produces a toxicity profile almost identical to that of vitamin D, but does not increase serum
calcium levels.81 Third, one group used vitamin D to produce
calcium deposition in the kidneys of chickens
at doses that did not lead to hypercalcemia.104 This finding is consistent with a case report of four post-menopausal women who were taking undetermined doses of vitamin D without their knowledge in the form of supplements that appeared to be contaminated with large amounts of vitamin D2: these patients had abnormally high vitamin D
levels, three times the
calcium in their urine as is
normal, and appeared, albeit inconclusively, to have associated bone loss.