Researchers from the German Cancer Research Center (GCRC) put together a new study about it showing that supplementing with vitamin D – this can include just going outside and exposing your skin to natural sunlight – can help reduce cancer mortality in patients with a cancer diagnosis by up to 12 percent. Put another way, cancer patients whose doctors are likely telling them that chemotherapy and radiation are their only options can take matters into their own hands by getting more vitamin D, which could keep them from dying – and possibly, in conjunction with an aggressive anti-cancer diet and lifestyle regimen, overcome the disease entirely.