NOTE: Some have argued that fish oils are oxidative upon digestion and that fish oil thus probably does significant aging and cellular damage internally that we may not yet understand. However, several studies suggest this to be a relative non-issue.  In addition, one study also found that additional Vitamin E can protective help overcome most of the small amount of oxidative damage that is done anyway. The study authors found that oxidative products in the urine "more than doubled when the fish oil capsules were introduced but then dropped by a factor of four when vitamin E was added. The vitamin E concentration in the red blood cells dropped very significantly when fish oil was ingested but more than recovered with the vitamin E supplement". 
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Current practice states that men with prostate cancer should not receive testosterone as it is thought to accelerate an active case. Note that testosterone is not thought to cause prostate cancer, but may speed up the severity of the disease. Men who are, or have been treated for prostate cancer are at risk for the fatigue and decreased libido of low testosterone as well. Since hormone replacement is typically not recommended for this group, other options are needed. A special combination of two forms of the nutritional supplement carnitine has shown equal effectiveness in battling fatigue and maintaining well being [Source: Cavallini ]. This combination contains 2,000 mg of acetyl L-carnitine and 2,000 mg of propionyl L-carnitine. The heart benefits that are seen with testosterone replacement have not been studied with this combination.