Vitamin D2 (ergocalciferol), unlike D3 (cholecalciferol), ineffective for immune health

A very important study, with huge ramifications, considering most people taking prescription vitamin D are consuming vitamin D2 (ergocalciferol) as that is the only FDA-approved vitamin D variety available for oral use. The widely available OTC variety vitamin D3 (cholecalciferol) is not FDA-approved and doctors rarely prescribe it to their patients out of litigation fears. … Read more