Testosterone is produced by the Leydig cells in the male testicles, and it affects the production of sperm, the behaviour of men, and the condition of their muscles and bones. Testosterone causes secondary sexual characteristics: beard, moustache, hair, and is responsible for the function of the accessory gonads, prostate, and semen.
The most common causes of testosterone decrease in men are: hypogonadism, orchidectomy (testicular removal), oestrogen therapy, Klinefelter syndrome, hypopituitarism, and liver cirrhosis.
What influencing factors might be behind proper testosterone production?
- Insulin resistance
- Type 2 diabetes
- Thyroid dysfunction
- Liver and kidney diseases
- Large amounts of outwardly steroid intake reduce the levels of testosterone that were originally normal, resulting in impaired sperm production.
- Around the age of 50, testosterone levels begin to decline as a natural process of ageing.
- Previous radiotherapy may also affect testosterone levels.