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[–]In-the-clouds 4 insightful - 2 fun4 insightful - 1 fun5 insightful - 2 fun -  (0 children)

The study was not only on flaxseed oil, but also combined with a fat-restricted diet. It could be that a low-fat diet is the main contributing factor to lowering testosterone. This study observed a 15% reduction in testosterone from the fat-restricted, but flaxseed oil supplemented diet.

But the study had something good to say about flaxseed oil:

Flaxseed is a rich source of lignan and omega-3 fatty acids and may thwart prostate cancer.