Testosterone

Testosterone is a hormone that is essential to the development of male growth and masculine characteristics. It boost sperm production, sexual desire, bone density and muscle mass. Testosterone plays a key role in your muscle mass and bones, facial and pubic hair, body's development of deeper voices, sex drive, mood and quality of life as well as verbal memory and thinking ability. Testosterone production increases during adolescence and early adulthood, and declines after age 30. Benefits of increasing testosterone levels include improving heart and blood health, stronger bones, more muscles, better verbal memory, improved mood and improved libido. 

The following have been found to be some of the best testosterone boosting supplements: 

• Vitamin D
• Zinc
• Tribulus