Front Matter

Bodily systems affected by testosterone

Brain/Focus

Muscle mass

Kidney

Lean body mass

Bone

Testosterone levels can affect mood,

mental focus, memory and libido.

Helps build muscle

strength and endurance.

Hypothalamus

GnRH

Anterior pituitary

ACTH

Adrenal glands

Gn

Testes

Testosterone

Stimulation of erythropoietin.

(essential hormone for red cell production)

Testosterone improves body

composition.

Low levels of testosterone can affect

bone density and can increase risk

of osteoporosis.

*Source: “Testosterone: A Man’s Guide”

Second Edition by Nelson Vergel (2011 )

Ne

ga

tiv

e^

fee

db

ca

k

Figure 7.9 Wide‐ranging effects of testosterone on the human male body. Reproduced with permission of Nelson
Vergel.