Scientists in Canada have uncovered a powerful new way vitamin D may help protect the body against cancer — by directly shutting down a protein that fuels cancer cell growth.

In the study, researchers found that vitamin D targets c-MYC, a protein known for pushing cells to multiply uncontrollably and playing a role in many types of cancer. When vitamin D is active in the body, it reduces the activity of this protein and boosts a natural suppressor that keeps c-MYC in check.

This discovery helps explain why low vitamin D levels have long been linked to higher cancer risk. In laboratory and animal studies, cells exposed to vitamin D showed slower growth and less aggressive behavior, while the absence of vitamin D signaling allowed cancer-driving proteins to surge.

While scientists stress this is not a cure, the findings offer important insight into how something as simple as vitamin D can influence cancer at a molecular level — and why maintaining healthy vitamin D levels may play a role in prevention.