Low Testosterone May Mark Higher Cancer Risk, Large Study Finds

An international analysis of 11 long-term studies including over 26,000 men found that very low testosterone levels are associated with a higher risk of cancer diagnosis and cancer death, particularly when testosterone falls below about 7.3–8.6 nmol/L; the study does not prove causation and does not advocate testosterone supplementation, but suggests testosterone could be a biomarker for overall health, with prostate cancer not showing a clear link in these data.