Testosterone Pellets vs Injections: Which Delivery Method Is Best?

Written by Adam Maggio | Medically reviewed by Dr. Mitchell Ross, MD, ABAARM

Testosterone pellets (Testopel) are implanted subcutaneously every 3–6 months and provide stable testosterone levels without daily or weekly dosing. Injections offer more flexibility and dose adjustability. Pellets suit patients who prefer convenience; injections suit those who need dose flexibility.

The Delivery Method Question in TRT

Testosterone replacement therapy can be delivered through multiple routes: injections, transdermal gels and creams, patches, oral preparations, and subcutaneous pellets. Each method has distinct advantages and disadvantages, and the optimal choice depends on the patient's lifestyle, preferences, and clinical needs.

Testosterone Pellets (Testopel)

Testosterone pellets are small cylinders of crystalline testosterone that are implanted subcutaneously, typically in the upper buttock or hip area, under local anesthesia. The pellets slowly dissolve over 3–6 months, releasing testosterone at a relatively constant rate. The primary advantage of pellets is convenience — once implanted, patients do not need to think about their TRT for months. Testosterone levels are generally stable without the peaks and troughs associated with weekly injections. Disadvantages include the minor surgical procedure required, the inability to quickly adjust the dose, the risk of pellet extrusion (~5% of cases), and higher cost than injections.

Testosterone Injections

Injectable testosterone (cypionate or enanthate) is the most widely used TRT delivery method, administered intramuscularly or subcutaneously every 3.5–14 days. Injections offer the greatest flexibility — doses can be adjusted at any time, and the method is inexpensive. The main disadvantage of weekly or biweekly injections is the peaks and troughs in testosterone levels. More frequent injections (every 3.5 days) significantly reduce these fluctuations.

Who Should Choose Pellets?

Pellets are an excellent choice for: patients who have difficulty remembering to inject or apply gels, those who travel frequently, patients who have achieved stable, well-tolerated testosterone levels and do not anticipate needing dose adjustments.

Who Should Choose Injections?

Injections are preferable for: patients who are new to TRT and still finding their optimal dose, those who have variable responses to testosterone and need dose flexibility, patients with cost constraints, and those who are comfortable with self-injection.