Men’s testosterone levels have been declining over the last few decades, and no one knows exactly why. But South Florida doctors and researchers offer new ways to combat the problem.

When a man’s level falls below normal, his sex drive, energy levels, body hair, and muscle size are affected. Low testosterone also can be a trigger for depression. A simple blood test — at home or in a lab — can reveal whether testosterone levels are low.

South Florida doctors say they now have many options to raise testosterone levels: shots, gels, patches, and more.