"Researchers in Brazil have found that a simple vitamin D supplement may help chemotherapy work better in women with breast cancer. The study suggests that low doses of the vitamin could improve treatment outcomes …
"The research, funded by FAPESP, included 80 women over the age of 45 who were preparing to begin treatment … Participants were split into two equal groups. One group received a daily dose of 2,000 IU (international units) of vitamin D, while the other group was given placebo tablets.
"All of the women underwent neoadjuvant chemotherapy, a treatment given before surgery to shrink tumors and make them easier to remove.
"After six months, the difference between the two groups was notable. Among those taking vitamin D, 43% experienced complete disappearance of their cancer following chemotherapy. In comparison, only 24% of those in the placebo group saw the same result."
https://www.sciencedaily.com/releases/2026/04/260428004119.htm