Vitamin Doubles Chemotherapy Success Rate

The survival rate of breast cancer is very encouraging. If you catch it in stages 1, 2, or 3, the five-year survival rate is 87 percent or higher.

The percentage of those who receive complete remission—meaning there’s no evidence of cancer—ranges from 30 to 80 percent.

Obviously, you’d want to do everything possible to be on the higher end of that range.

You can do that by taking the one vitamin shown to DOUBLE the success of breast cancer treatment in women.

We already know that there’s a connection between vitamin D and cancer.

Low levels of D are linked to an increased risk of multiple types of cancer.

High levels are associated with a reduced risk of colon, breast, and prostate cancer, among others.

But the question researchers wanted to know was, can boosting your vitamin D levels help fight cancer if you already have it?

To find out, 80 women with breast cancer took 2,000 IUs of vitamin D or a placebo daily, along with chemotherapy.

The type of chemo they received, neoadjuvant chemotherapy, is designed to work along with surgery. First, the chemo shrinks the tumor, then the surgery removes the rest.

Six months later, the cancer had disappeared in 43 percent of those taking vitamin D, compared to 24 percent of the placebo group.

The technical term for this is “pathological complete response,” which means that there was no evidence of cancer in the breast tissue or lymph nodes.

Not only does that mean they can now be called “cancer-free,” but it’s also associated with a better prognosis and longer overall survival in the future.

As is often the case with adults these days, most of the women were deficient in vitamin D at the start of the study, and their levels increased as they were supplemented.

Does this prove that increasing your vitamin D will cure your cancer? No.

But it definitely gives you a better fighting chance.

And since vitamin D is safe, cheap, and widely available, it can easily be included as part of any cancer-fighting plan. Talk to your oncologist about taking vitamin D.

P.S. The secret to maintaining vitamin D year-round.

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Omodei, M. S., Chimicoviaki, J., Buttros, D. A. B., Almeida-Filho, B. S., et al., Vitamin D Supplementation Improves Pathological Complete Response in Breast Cancer Patients Undergoing Neoadjuvant Chemotherapy: A Randomized Clinical Trial. Nutrition and Cancer, 2025, 77(6), 648–657. DOI:10.1080/01635581.2025.2480854