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Testosterone is a hormone that mostly produced in the testicles and is the primary sex hormone for those who are born male.

“It’s involved in many natural processes in the body and helps maintain muscle mass, bone mineral density, sperm production, red blood cell production, and sex drive,” explains Darshan Patel, M.D., assistant professor of urology at the Men’s Health Center at the University of California, San Diego.

Your testosterone levels are low, and you’re now suffering from the adverse effects. Your mood has been low, you’re tired, and you may have gained some weight. You may also have a reduced libido. Your doctor recommended that you try increasing your testosterone levels.