Vitamin D could help cancer patients live longer

"'Vitamin D had a significant effect on lowering the risk of death among those with cancer, but unfortunately it didn't show any proof that it could protect against getting cancer,' said Tarek Haykal, a lead author on the study and an internal medicine resident physician at Michigan State University and Hurley Medical Center in Flint, Michigan."

https://www.sciencedaily.com/releases/2019/06/190604101634.htm

Vitamin D is the only supplement I take. I take it because I’m fair skinned and I avoid the Sun.