Never start Testosterone without having the levels checked first - Mayo clinic also checks free Testosterone (gold standard) - this should be above 6.5 ng/dL but most men live > 10 ng/dL. Low T = symptoms + low biochemical levels. Replacement needs to normalize where the T should have been. Like most medications T is beneficial in the correct range (too low or too high causes problems).

Libido is complicated, but it will increase with higher T. Lifting weights, adequate protein intake, adequate sleep and stress mitigation can facilitate higher T levels naturally - all of these things will also make you live longer and ward off things like dementia, heart disease and cancer. There are numerous studies showing building muscle strength extends healthspan (not just lifespan)!

Best

Dr Kohler
Professor of Urology