this can potentially contribute to:
Kidney stones
Kidney damage
Soft-tissue calcification
Abnormal heart rhythms
In extreme cases, NIH notes that vitamin D toxicity can cause kidney failure, cardiac arrhythmias and other serious complications.
Fortunately, toxicity is unusual when vitamin D is taken appropriately.
How Much Vitamin D Is Too Much?
For adults, the NIH lists a Tolerable Upper Intake Level of 4,000 IU (100 mcg) per day from all sources for routine intake.
That number needs an important explanation.
4,000 IU isn’t the point at which toxicity suddenly
