Laboratory studies also show that Vitamin D keeps cancer cells from growing and dividing. There are supporting evidences that larger doses of Vitamin D is helpful for prostate cancer treatment.
Continuous low-dose of vitamin E, as part of a daily antioxidant pill, is found to reducing cancer risk. It was found that vitamin E and vitamin C are yet more powerful together. Therefore, it is recommendable to take vitamin C (500 mg twice daily) as additional supplementation.
There are studies showing a significant relationship in the risk of cancer reduction and the intake of Vitamin B6, Folate and Vitamin B12 together. Folate is a key ingredient to fight cancer. Studies show that people with higher than average amount of folic acid from their diets or supplements have lower risks of colon cancer, prostate cancer and breast cancer.
Selenium
Selenium is the minerals most found in many studies and references as helpful for prostate. Selenium is a mineral component of antioxidant enzymes. Plant foods like rice and wheat are the major dietary sources of selenium in most countries. The amount of selenium in soil, which varies by region, determines the amount of selenium in the foods grown in that soil. Therefore, supplementation is advisable.
Soy and components of soy called "isoflavones", have been used for several health conditions. Isoflavones (such as genistein) are believed to have estrogen-like effects in the body, and as a result, are sometimes called "phytoestrogens." Isoflavones have been found in studies to have anticancer effects acting as a tyrosine kinase inhibitor, a mechanism that causes cancer cell death.
Lycopene, a substance found mainly in tomato products, has also been found to be helpful in preventing and fighting prostate cancer.