Initial Posting: 2/15/2015    Last Update: 8/4/2017
Question: Can taking fish oil or calcium supplements increase my risk of prostate cancer? My doctor recommended that I stop taking them since I have an enlarged prostate.
Answer: The evidence regarding fish oil and prostate cancer is mixed: some observational studies have found an increased risk among men with high blood levels of omega-3 fatty acids DHA and EPA, but fish oil supplementation has not been found to increase the risk of prostate cancer. There are studies currently underway that are investigating this issue.
Similarly, the research on calcium supplementation and prostate cancer is far from conclusive. However, the evidence suggests that most men over the age of 50 can probably get all the calcium they need from foods and should limit their total intake from foods and supplements.