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Folic Acid and Prostate Cancer

Shannon J, Phoutrides E, et al.
Folate Intake and prostate cancer risk: a case-control study. Nutr Cancer 2009;61(5):617-28.

Folate deficiency has been implicated in the carcinogenesis of several tumor types. The role of folate in prostate cancer remains indeterminate. We investigated folate as a risk factor for prostate cancer among 140 biopsy-confirmed prostate cancer patients, 230 age-matched clinic controls, and 250 negative prostate biopsy controls. Dietary folate intake was inversely associated with overall risk of prostate cancer as compared to clinic controls (P for a linear trend = 0.003). When stratified by disease severity, dietary folate and folate from natural sources were associated with reduced risk of high-grade cancer as compared to both clinic controls (P for a linear trend = 0.0009 and 0.02, respectively) and biopsy negative controls (P for a linear trend = 0.03 and 0.05, respectively). There was no interaction between alcohol consumption and folate intake. These analyses support an inverse association between dietary folate intake and prostate cancer risk and primarily risk of high-grade prostate cancer.

Note:  most vitamin/mineral supplements contain 400 to 800 mcg of folic acid.  Dr. Klein recommends 5,000 mcg (5 mg) of folic acid daily. At this dosage it also lowers cholesterol, tends to reverse 'hardening of the arteries, and may be cytoprotective for Alzheimer's disease.