Long-term supplementation of vitamin D3 in doses ranging from 5,000 to 50,000 IU appears safe when taken correctly. Many people do not have side effects from the 50,000 IU dose, but this high a dose ...
We spoke to experts to get the DL on vitamin D3. Here's what to know about vitamin D3 benefits, sources, deficiencies, side effects ... in dosages between 1000–5000 IU, but some are higher.