Improvement in mood and sense of well-being

Increased mental alertness and physical energy

Decreased anger, irritability, sadness, tiredness, nervousness

Improved quality of sleep

Improved libido and sexual performance

A decline in biochemical markers of bone degradation and an increase in bone density

An increase in lean body mass, a decline in fat mass

An increase in muscle strength (hand grip, upper and lower extremities).

Potentially, a decrease in the risk of heart disease

With testosterone therapy, one's attitude improves, reinforcing self-esteem and self-confidence in success at work, and increased energy at home and in social activities.

Most men will feel more vigorous, experience improvement in energy levels, mood, concentration, cognition, libido, sexual performance and overall sense of well-being.

This effect is usually noted in 3 to 6 weeks. Other potential benefits include maintenance or improvement in bone density, improved body composition, muscle mass and muscle strength, as well as improvement in visual-spatial skills.

Worsening sleep apnoea — a potentially serious sleep disorder in which breathing repeatedly stops and starts.

Acne or other skin reactions.

Stimulating noncancerous growth of the prostate (benign prostatic hyperplasia) and growth of existing prostate cancer.

Enlarging breasts.

Due to it’s effect on the testis’ natural testosterone production, using testosterone therapy in the longer term, may lead to a need to take Testosterone for the rest of your life. It may also cause a reduction in the size of the testicles.

Limiting sperm production or causing the testicles to shrink. This can lead to infertility.

Stimulating too much red blood cell production, which contributes to the increased risk of forming a blood clot. A clot could break loose, travel through your bloodstream and lodge in your lungs, blocking blood flow (pulmonary embolism).