More Is Not Always Better
One important point is that vitamin D should not be treated as a supplement where higher doses are automatically better.
Excessive vitamin D from supplements can cause dangerously high calcium levels and may result in nausea, vomiting, weakness, confusion, excessive thirst and urination, kidney stones, kidney problems, and other serious complications. (Office of Dietary Supplements)For adults, the general upper limit is 4,000 IU (100 micrograms) per day from all sources unless a healthcare professional recommends a different therapeutic dose for a specific medical reason. (Office of Dietary Supplements)
