A new study correlates blood levels of Vitamin D over 40 ng/ml with a decrease risk of cancer. The marker of vitamin D used in the study was 25-hydroxyvitamin D, which is the main form in the blood. It appears that the overall level of cancer risk is reduced by higher levels of Vitamin D.
Vitamin D can be administered in different forms: tablet, capsule, liquid and intravenous. The daily dose needs to be adjusted to individual needs and titrated against the blood levels.
Sharon L. McDonnell, Carole Baggerly, Christine B. French, Leo L. Baggerly, Cedric F. Garland, Edward D. Gorham, Joan M. Lappe, Robert P. Heaney. Serum 25-Hydroxyvitamin D Concentrations ≥40 ng/ml Are Associated with >65% Lower Cancer Risk: Pooled Analysis of Randomized Trial and Prospective Cohort Study. PLOS ONE, 2016; 11 (4): e0152441 DOI: 10.1371/journal.pone.0152441