The time it takes for testosterone shots to work varies depending on the symptom and the type of testosterone used, but generally, you can expect the following timeline:

• Sexual desire (libido): Improvements often begin around 3 weeks after starting testosterone injections and tend to plateau by 6 weeks

• Erections and ejaculation: These may take longer to improve, sometimes requiring up to 6 months

• Mood and quality of life: Positive changes can start within 3 to 6 weeks, with maximum benefits developing over several months

• Energy levels: Increased energy and stamina typically appear around 3 months into treatment, continuing to improve thereafter

• Muscle mass and body composition: Noticeable changes generally begin between 3 to 4 months, with peak effects around 6 months or later

• Other health benefits: Improvements in insulin sensitivity may occur within days, while cardiovascular and metabolic benefits develop over months

Regarding the peak testosterone levels after injection , it depends on the ester type:

• Testosterone Propionate peaks in 24–48 hours.
• Testosterone Enanthate peaks in 24–72 hours.
• Testosterone Cypionate peaks in 48–72 hours.
• Testosterone Undecanoate peaks around 7 days after injection

Overall, while some effects like libido and mood can be noticed within a few weeks, full physical and psychological benefits of testosterone shots typically take 3 to 6 months to manifest fully

. Individual responses vary based on factors such as dosage, injection frequency, genetics, lifestyle, and overall health

. Consulting with a healthcare provider is essential to tailor treatment and monitor progress.