How the Sunshine Hormone Reduces Cancer Risk, Activates Your Cancer-Fighting Immune System, and What Your Blood Test Number Actually Means

Researched and written by Keith Bishop, Clinical Nutritionist, Cancer Coach, Retired Pharmacist, and Founder of Prevail Over Cancer and the Prevail Protocol.

Introduction: The Overlooked Hormone That Fights Cancer

Vitamin D3 — widely known as the "sunshine vitamin" — is one of the most extensively researched nutrients in cancer science today. Yet despite decades of compelling evidence, vitamin D3 deficiency remains a global epidemic, with an estimated 1 billion people worldwide carrying insufficient levels. In the United States alone, studies suggest that up to 40% of adults are deficient.

What makes this alarming in the context of cancer is the growing body of peer-reviewed evidence showing that adequate vitamin D3 levels are associated with meaningfully lower cancer risk, better treatment outcomes, reduced cancer mortality, and a more robust...