Androgens are produced by glands and they work as messengers carrying information across the body through blood. These are essential for proper growth and testosterone T is responsible for the changes in body needed for reproductive functions. T is made by testes and a small amount is produced by the adrenals. Testosterone T works as messenger from the pituitary to the testes and it is needed in adequate amount for the production of sperms.

The pituitary and the hypothalamus of the brain control the production of the chemicals - which includes the LH and FSH - the two main messengers in the brain which directly acts on the testes. The deficiency of androgens in male body can happen due to injuries to the brain part responsible for the production of T or due to injuries to testes. There are plenty of clues which can tell if a guy is suffering from testosterone deficiency and to know how to increase testosterone levels or increase male energy, one should first identify these clues.