Participants will receive different versions of the medication in a specific sequence to allow for a direct comparison. During the study, measurements will be taken to track the levels of the hormone in the body and to monitor safety. This includes checking physical health, skin condition, and vital signs, as well as performing an ECG, which is a test that records the electrical activity of the heart. The process involves using the gels under fasting conditions, meaning no food is consumed for a period before the medication is applied.

The purpose of the study is to understand how lutropin alfa affects the body, particularly in terms of increasing testosterone levels, which is a key hormone in men. Participants will receive different doses of lutropin alfa through subcutaneous injections, which means the medication is injected under the skin. The study will monitor how testosterone levels change in response to the treatment and compare these changes to those seen with the standard treatment, urinary hCG.

The study will take place over a period of time, with participants receiving the treatment and having their testosterone levels checked regularly. This will help researchers determine if lutropin alfa could be a more effective treatment option for men with hypogonadotropic hypogonadism or male infertility. The findings from this study could provide valuable insights into new treatment possibilities for these conditions.

The purpose of the study is to determine if using testosterone gel can improve sexual function in men who are undergoing a surgical procedure called radical prostatectomy, which is the removal of the prostate gland. Participants will be monitored for 12 months after their surgery to assess changes in their sexual health. The study will also look at other aspects of health, such as urinary function and hormone levels, over a period of up to 24 months.

Participants in the study will apply the gel to their skin, a method known as transdermal use. The study aims to provide insights into whether testosterone therapy can lead to better health outcomes for men with prostate cancer who have low testosterone levels. The findings could help guide future treatments for improving quality of life in these patients.

The purpose of the study is to explore how testosterone therapy, combined with exercise and diet counseling, affects muscle strength and mass in men who have had bariatric surgery. Participants will be randomly assigned to receive either the testosterone treatment or a placebo. The study is designed to be double-blinded, meaning neither the participants nor the researchers will know who is receiving the actual treatment or the placebo. This helps ensure that the results are not influenced by expectations or bias.

Throughout the study, participants will be monitored for changes in muscle strength, body composition, and physical function. This includes tests like measuring muscle strength in different parts of the body and assessing physical performance through activities such as stair climbing. The study will also look at other health indicators, such as glucose metabolism, which is how the body processes sugar, and blood clotting factors. The trial is expected to continue until early 2026, providing valuable insights into the potential benefits of testosterone therapy for men with obesity and low testosterone levels following weight loss surgery.

The purpose of the study is to understand how testosterone undecanoate affects liver fat and other health factors in men with these conditions. Participants will receive either the testosterone treatment or a placebo for 52 weeks. After this period, all participants will have the opportunity to receive the testosterone treatment for an additional 108 weeks. This will help researchers learn about the long-term effects of the treatment on body fat distribution and heart-related health factors.

Throughout the study, participants will undergo various assessments to monitor changes in their health, including the use of magnetic resonance spectroscopy (MRS) to measure liver fat content. This study aims to provide valuable insights into how testosterone treatment can impact men with type 2 diabetes, prediabetes, and low testosterone levels, potentially leading to better management of these conditions in the future.