The right choice depends on your individual factors—comfort level, dose requirements, lifestyle preferences, and body composition. Both intramuscular and subcutaneous injection methods are effective ways to deliver testosterone cypionate. Many clinics, including NRG Clinic, allow patients to try both methods to determine which works best for their body and lifestyle. Very lean individuals with minimal subcutaneous fat may have less success with SubQ injections, as there needs to be adequate fatty tissue for proper absorption. The best injection method depends on your individual circumstances, preferences, and treatment goals. When choosing between intramuscular and subcutaneous injections, several factors come into play. SubQ injections use much smaller needles—typically 27–30 gauge, just 0.5 inches in length. Unlike in Europe, Canada, and much of the rest of the world, oral testosterone undecanoate is not available in the United States. Major brand names of testosterone and/or its esters include Andriol, Androderm, AndroGel, Axiron, Delatestryl, Depo-Testosterone, Intrinsa, Nebido, Omnadren, Primoteston, Sustanon, Testim, TestoGel, TestoPatch, Testoviron, and Tostran. There is a medical condition called late-onset hypogonadism; according to Thomas Perls and David J. Handelsman, writing in a 2015 editorial in the Journal of the American Geriatrics Society, it appears that this condition is overdiagnosed and overtreated. Together, you and your healthcare provider will weigh the risks and benefits of TRT to see if it could help. Testosterone replacement therapy may be an option for you. If symptoms of low testosterone are interfering with your quality of life, know that you don’t have to just grin and bear it. For all these reasons, your healthcare provider will carefully consider if TRT is safe for you based on your unique characteristics. But there aren’t many studies on the long-term effects of TRT (for example, over decades). If you don’t have these health concerns, TRT is generally safe. This is why healthcare providers do extensive evaluations and tests before approving the use of TRT. The majority of these events were mild to moderate, although 5 patients experienced severe events. Four participants reported small, painless nodules that resolved within 2 days, while 2 participants developed urticaria at the injection site within a few hours that persisted for up to 3 days. In addition, there is no risk of sciatic injury, administration can be accomplished using smaller needles, and the pain evoked during SC administration is usually lower. C, Trough total testosterone concentrations on SC testosterone cypionate in 11 transgender men. To the contrary, after SC administration, the drug is delivered to the hypodermis (adipose tissue underlying the dermis), which is not only less vascularized compared to skeletal muscles, but the flow in this region does not increase significantly with physical activity. This results in some of the esterified testosterone entering the lymphatics, thus prolonging the secondary absorption phase. Molecules smaller than 1 kDa, such as testosterone, are preferentially absorbed by the blood capillaries because of the high rate of filtration and reabsorption of fluid across vascular capillaries (39). Warm up your body before you inject. Switching sites stops sore spots and keeps your skin healthy. Safe self-injection means more control, less pain, and steady gains—right where you want them. Most bodybuilders use the outer thigh or the top, outside part of the buttocks. Giving yourself a testosterone shot might seem hard at first, but it gets easier each time. Put used needles in a sharps container right after each injection. For storage, keep your testosterone vial cool and dry.
