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.