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Testosterone is a key male hormone that is responsible for characteristics like hair growth, muscle mass and deepening of the voice. As men age, testosterone levels gradually decline, particularly over 40.
"The main complaint I see as a urologist is a lack of interest in sexual functioning," says Dr. Broderick. "But fatigue, changes in mental acuity, less stamina and very often mild degrees of depression are associated with falling testosterone."
In some cases, infertility can be tied to low testosterone. But presenting these symptoms or traits is not an automatic diagnosis.
"Not all men need testosterone," says Dr. Broderick. "It's very important that this diagnosis is properly made based on symptoms but also the serum level of testosterone in the blood."
"Each of those avenues is designed to get you back to a normal level of testosterone," says Dr. Broderick. "What you should notice is that within 48 to 72 hours of your dosage that your desire has improved."