What is a subcutaneous injection?
A subcutaneous injection is an administration method that delivers testosterone into the fat layer directly under the skin, rather than into muscle tissue.
Subcutaneous injection places testosterone into the subcutaneous fat layer, the tissue sitting directly beneath the skin and above the muscle. This differs from intramuscular (IM) injection, which penetrates deeper into the muscle itself. The method uses a shorter needle, typically 25 to 27 gauge, and requires less depth of penetration.
For testosterone replacement therapy, subcutaneous administration has gained adoption in recent years. The approach allows for smaller, more frequent doses and may reduce injection site reactions in some patients. Because testosterone absorbs more gradually through fat tissue compared to muscle, subcutaneous dosing often involves weekly or twice-weekly injections at lower volumes per dose.
Practitioners in the Miami area and beyond offer both subcutaneous and intramuscular injection protocols, with selection depending on patient preference, medical history, and treatment goals. Patients beginning testosterone replacement therapy should discuss injection depth, frequency, and needle size with their provider to determine which method fits their situation.
Subcutaneous injection carries lower infection risk than IM injection because it avoids deeper tissue, though proper injection technique and sterile procedure remain essential regardless of method.