Is It OK to Take Supplements After a Prostate Cancer Diagnosis? by Stuart Jordan
We were recently asked by a newly diagnosed member of our group—who is preparing to begin treatment—about a dietary supplement he has been taking. His question had two parts: Could this supplement help with prostate cancer? And just as important, is it safe to keep taking it now?
It’s a fair question, and a very common one. Many supplements are marketed as supportive of prostate health, metabolism, or weight management, and it’s easy to assume they might be helpful during cancer treatment.
In my day job as publisher of the Wellness Letter, we often see how supplement claims outpace the science behind them. That’s why we rely on evidence-based research as the final word when exploring questions like these.
When we look closely at the research, the picture is clearer than the marketing suggests. So far, no dietary supplement has been shown in solid human studies to prevent, treat, or slow the progression of prostate cancer once diagnosed. Some supplements that once sounded promising haven’t held up in careful trials. Others affect lab markers, such as PSA, without improving outcomes that truly matter. In fact, some supplements—like high-dose vitamin E or selenium—have actually shown potential harm in trials.
Safety is just as important. Supplements and over-the-counter products can interact with medications, affect lab results, or interfere with how treatments work. This matters whether a man is on active surveillance, receiving hormone therapy, undergoing radiation therapy, or after treatment. Even products that seem harmless can complicate care if the medical team isn’t aware of them.
That’s why it’s essential to tell your doctors about every supplement and over-the-counter product you’re taking, not just prescriptions.
Instead of relying on supplements, focusing on overall health—through diet, physical activity, weight management, and addressing true deficiencies—offers a safer, better-supported path, especially when coordinated closely with your medical team.
-Stuart Jordan