Mike (Michael) Adams (Natural News) : New research shows vitamin D slashes risk of cancers by 77 percent; cancer industry refuses to support cancer prevention.

https://naturalnews.com/021892.html

https://bibliotecapleyades.net/salud/salud_defeatcancer43.htm 

Dr Robert Heany of Creighton University, one of the top vitamine D researchers, has stated that as many as 75% of the women in the United States are deficient.

Dr Gabriel Cousens advices 5000 to 10 000 IU daily.

Source: Gabriel Cousens, There is a cure for diabetes, The 21-Day+ Holistic Recovery Program