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But even with these differences, testosterone gels still carry a significant risk of lowering sperm production, and men who want children should be aware of this. Because gels produce smoother and more even testosterone levels, some people assume they might have a smaller effect on fertility. Injections deliver testosterone directly into the muscle, where it enters the bloodstream and causes a fast rise in testosterone levels.
After about age 30, testosterone slowly drops each year. For most people, testosterone peaks in the late teen years and early 20s. It also covers what younger and older patients should consider before starting treatment. Understanding these differences is important for anyone who is thinking about TRT and also wants to protect or plan for future fertility. This can be a challenge for men who may want to restore fertility quickly. Because pellets provide a long-term, steady release, they avoid the large hormone peaks seen with injections.
Some men who have a testosterone deficiency have symptoms or conditions related to their low testosterone that will improve when they take testosterone replacement. All of this reduces the active (free) form of testosterone in the body. In recent years, researchers (and pharmaceutical companies) have focused on the effects of testosterone deficiency, especially among men.
While this article does not give medical advice, it is important to know that slow recovery is not unusual and often treatable. Doctors sometimes prescribe medicines that stimulate LH and FSH production if natural recovery is slow. Younger men usually recover faster because their testes and hormone pathways are more responsive. When TRT is stopped, the brain needs time to "turn back on" these signals.
This includes the intratesticular testosterone needed for healthy sperm production. When you take TRT, the body senses that testosterone levels in the blood are high. TRT is one of the main treatments doctors use to bring testosterone levels back to a healthy range. Testosterone Replacement Therapy, often called TRT, is a medical treatment used to raise testosterone levels in people who have low testosterone. In a natural system, this balance keeps hormones stable and supports sperm production. But for sperm production, the most important testosterone level is the amount inside the testicles, not in the bloodstream. Both hormones are needed to keep sperm production strong.
This could explain why some studies find a link between testosterone and pro-social behaviour, if pro-social behaviour is rewarded with social status. Rats who were given anabolic steroids that increase testosterone were also more physically aggressive to provocation as a result of "threat sensitivity". One study found that administering testosterone increased verbal aggression in some participants.
Therefore, these mammals may provide a model for studying clinical populations among humans with sexual arousal deficits such as hypoactive sexual desire disorder. Sexual arousal and masturbation in women produce small increases in testosterone concentrations. Testosterone is included in the World Health Organization's list of essential medicines, which are the most important medications needed in a basic health system. Attention, memory, and spatial ability are key cognitive functions affected by testosterone in humans. It activates genes in Sertoli cells, which promote differentiation of spermatogonia. These include adult-type body odor, increased oiliness of skin and hair, acne, pubarche (appearance of pubic hair), axillary hair (armpit hair), growth spurt, accelerated bone maturation, and facial hair. The levels remain in a pubertal range for a few months, but usually reach the barely detectable levels of childhood by 4–7 months of age.
When LH and FSH are suppressed, the testes produce less intratesticular testosterone, which is the form of testosterone needed to make sperm. These peaks can strongly suppress the body’s natural release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Testosterone replacement therapy (TRT) can be given in several different forms, and each method affects the body in a unique way. Monitoring lets doctors adjust medication doses, change therapy plans, or pause certain treatments when needed. This may include blood tests, semen analysis, and questions about symptoms over time. Because each patient’s situation is different, hormone levels must be checked regularly. These therapies are often recommended when sperm counts are already very low or when a couple is trying to conceive within a specific timeframe.