Researchers tested the combination therapy on a group of 15 men, who possibly had early-stage prostate cancer according to biopsy. They were put on a low-fat diet, and supplemented with 30 g daily of ground flaxseeds. Of these, two did not need a repeat biopsy because PSA levels had normalized, while only one of the other 13 had possible prostate cancer on follow-up biopsy.

It's been suggested that ground flaxseed may be safer than flaxseed oil, although patients may develop vitamin B6 deficiency.