Some men may notice an increase in muscle mass and a decrease in fat, leading to a healthier body composition overall. This type of weight gain is often linked to lower muscle mass and higher levels of body fat, especially visceral fat. As mentioned previously, in this latter patient, a single serum testosterone measurement 1 to 5 days after an injection would lead to a dose increase that would be anticipated to maintain serum testosterone levels within the normal range throughout the dosing interval. Only one patient had a single serum testosterone level slightly below the normal range and because their serum testosterone levels were fairly stable and consistently in the lower range of normal through the week, this could easily be corrected by an increase in the dose. "Anabolic" refers to muscle building, and "androgenic" refers to increased male sex characteristics. Your adrenal glands also produce the hormone dehydroepiandrosterone (DHEA), which your body transforms into testosterone and estrogen. If testosterone levels are too high or too low, it can cause certain symptoms. Download our e-book and learn about the importance of a healthy body composition for the immune system Testosterone plays a major role in building and maintaining muscle tissue. Understanding this relationship is crucial for individuals considering or already undergoing therapy. However, the key to success is maintaining balance and working closely with healthcare providers to minimize risks. Late-onset male hypogonadism happens when the decline in testosterone levels is linked to general aging and/or age-related conditions, particularly obesity and Type 2 diabetes. Classical male hypogonadism is when low testosterone levels are due to an underlying medical condition or damage to your testicles, pituitary gland or hypothalamus. It’s unlikely — and difficult to tell — that a male adult has higher-than-normal levels of testosterone. TRT can increase both fat and muscle mass, but the proportions depend on how your body responds to the therapy. TRT works by increasing testosterone levels to a healthy range, potentially reversing many of the effects of low testosterone. By increasing testosterone levels, TRT can help the body build muscle, burn fat, and improve energy levels. On the other hand, healthy testosterone levels can help maintain a balance by supporting muscle growth and reducing fat storage. In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair. Men who watch sexually explicit films also report increased motivation and competitiveness, and decreased exhaustion. This reaction engages penile reflexes (such as erection and ejaculation) that aid in sperm competition when more than one male is present in mating encounters, allowing for more production of successful sperm and a higher chance of reproduction. Studies conducted in rats have indicated that their degree of sexual arousal is sensitive to reductions in testosterone. Testosterone levels follow a circadian rhythm that peaks early each day, regardless of sexual activity. Regular monitoring during treatment typically includes hematocrit levels every 3-6 months to prevent polycythemia, along with PSA monitoring in men over 40. It can be administered as a cream or transdermal patch that is applied to the skin, by injection into a muscle, as a tablet that is placed in the cheek, or by ingestion.