The scientific evidence that vitamin D reduces risk of many types of conditions and diseases and improves disease outcomes is moderately strong. [1] However, the allopathic/Western medical system in charge of medical policy considers vitamin D to be inexpensive competition and has done everything possible to cast doubt on vitamin D and block its approval for use by physicians for preventing or treating disease. How they use the Disinformation Playbook was spelled out in 2018. [2] One way this Playbook is used is to demand verification of vitamin D’s effects through randomized controlled trials (RCTs). Read more.