Testosterone levels in men decline gradually starting around age 30. Because it comes on slowly, men often accommodate to the symptoms of low testosterone and do not realize how much they have lost. Men who receive Testosterone Injections consequently report that they feel stronger and healthier. They state that it makes them feel as they did when they were in their prime. Some benefits may include: Higher energy levels and motivation, less irritability and fewer mood swings, lower risk of depression and anxiety, enhanced libido, improved quality and frequency of erections, increased lean mass and improved strength, better verbal memory and visuospatial cognitive function, improved skin thickness and health, enhanced fertility.