A microbiome is a collection of all the taxa that constitute the microbial community in a particular organ or system. This review included cross-sectional, case-control, retrospective, and prospective cohort studies. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. It releases several hormones that control your pituitary gland. Specialized glands that make up your endocrine system make and release most of the hormones in your body. It has been demonstrated that testosterone replacement treatment (TRT) improves muscle mass, strength, and physical function in hypogonadal men, while research indicates that men with low testosterone levels have decreased muscle mass and strength . The production of testosterone in men is primarily controlled by negative feedback mechanisms, whereby high levels of testosterone prevent the release of GnRH from the hypothalamus and LH from the pituitary, thereby limiting further testosterone synthesis; testosterone is made from cholesterol by a variety of enzymatic pathways in the testes . Considering the prospective benefits of testosterone therapy, more investigation and clinical testing are necessary to completely comprehend its effects and improve therapeutic modalities. It has an effect on many body systems, underscoring its importance for men's physical health and fertility. The development and maintenance of muscular mass, bone density, and general physical strength depend heavily on testosterone, a hormone that plays a complicated and significant role in men's physiology. 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. If any of these organs — your hypothalamus, pituitary gland or gonads — aren’t working normally, that can cause abnormal testosterone levels. The gut-testicular and gut-brain axes could have significant effects on testosterone production, metabolism, and action. This is consistent with the findings of Matsushita et al. (2022b), who reported a more significant number of gut microbes in the high-testosterone group than in the low-testosterone group. Furthermore, some studies provided only phyla, rather than microbiome species (Jie et al., 2021; Matsushita et al., 2022b; Shin et al., 2019). These six studies differed in their reporting of the dominant microbiome types in their subjects. All studies that matched the keyword findings were exported to the Mendeley reference manager.
