Testosterone pellets are small, rice-sized implants placed under the skin that release a steady dose of testosterone over several months. Each pellet is a cylinder of crystalline testosterone, about 3.2 mm wide and 8 to 9 mm long, weighing roughly 75 mg. They were first approved by the FDA in 1972 and remain one of the longest-acting forms of testosterone replacement therapy available.
How Pellets Release Testosterone
Once implanted, testosterone pellets dissolve slowly into surrounding tissue at a remarkably consistent rate of about 1.3 mg per day for each 200 mg pellet. This near-constant release is what sets pellets apart from other delivery methods. Injections create peaks and valleys in hormone levels as the dose surges and then tapers. Gels require daily application and can transfer testosterone to others through skin contact. Pellets avoid both of these issues by maintaining physiological testosterone levels for months at a time.
Blood levels typically peak during the first month after implantation and stay in the normal range for four to six months, depending on the dose. A 600 mg dose generally lasts four to five months, while a 1,200 mg dose can last about six months. Most men return for re-implantation roughly every five to six months.
What the Procedure Looks Like
The insertion is a minor in-office procedure. A provider numbs a small area on the upper outer buttock, makes a tiny incision, and uses a specialized instrument to slide the pellets just under the skin. The incision is closed with small adhesive strips rather than stitches.
Recovery is straightforward. The dressing comes off after about 24 hours, and the adhesive strips stay on for about a week until they fall off on their own. You should avoid submerging the site in water for 48 hours, meaning no swimming or baths. Exercises that put pressure on the area, like squats or hip thrusts, should also wait 48 hours to reduce the risk of the pellets being pushed out. An ice pack on the site during the first day can help with any discomfort.
Typical Dosing
The FDA-approved product, Testopel, comes in 75 mg pellets. The original 1972 labeling recommended two to six pellets (150 to 450 mg) every three to six months, but clinical experience has shifted that number upward. More recent studies suggest that 10 pellets (750 mg) produce the most reliable testosterone levels for most men. Providers adjust the number of pellets based on symptoms, body weight, age, and how a patient responds to prior doses. A standard clinical dose is often around 800 mg, implanted every five to seven months.
Benefits Compared to Injections and Gels
The biggest practical advantage is convenience. Once the pellets are in, you don’t think about testosterone therapy for months. There are no weekly injections, no daily gel applications, and no risk of accidentally transferring hormones to a partner or child through skin contact.
The steady hormone release also appears to cause fewer blood-thickening side effects. A study comparing all three delivery methods found that an abnormally high red blood cell concentration occurred in about 67% of men on injections, 35% of men on pellets, and 13% of men on gels. When it did occur in pellet users, it took longer to develop, averaging over 16 months compared to about 10 months with injections. Pellets also showed a shorter-lived increase in estrogen levels compared to injections and gels, with the elevation resolving by the six-month mark.
Risks and Side Effects
Testosterone pellets carry a low overall complication rate. In a review of over one million procedures, fewer than 1% resulted in any complication.
The most common issue is pellet extrusion, where one or more pellets work their way back out through the skin. This happens in fewer than 3% of procedures in men and less than 1% in women. It’s more likely if you do heavy lower-body exercise too soon after insertion. When multiple pellets extrude, the duration of the dose shortens, meaning you may need to come back sooner for your next round.
Infection at the insertion site (cellulitis) occurred in less than 0.5% of male procedures and less than 0.03% of female procedures. Bleeding was reported in under 1% of cases. No allergic reactions or significant scarring were documented. Some patients develop a small area of firmness under the skin that can be felt by touch, but this resolves on its own, typically by the time the next insertion is due.
Who Pellets Are Designed For
Testosterone pellets are prescribed for men with clinically low testosterone, a condition called hypogonadism. To qualify, you generally need at least two separate blood draws showing low morning testosterone levels, since testosterone naturally fluctuates throughout the day and peaks in the morning. Pellets are also used for delayed puberty in adolescent males and, in some cases, as part of hormone therapy for gender dysphoria.
They’re a particularly good fit if you’ve found daily gels inconvenient, if you have skin sensitivity to topical products, or if injections cause noticeable mood or energy swings between doses. They’re less ideal if you might need to stop testosterone therapy quickly, since once implanted, the pellets can’t easily be removed and will continue releasing hormone until they fully dissolve.
Cost and Insurance Coverage
Testosterone pellets tend to cost more per procedure than a month’s supply of gel or injectable testosterone, though the per-month cost can be comparable since each insertion covers several months. Coverage varies by insurer. Major insurers like Aetna cover Testopel as medically necessary when there’s a confirmed diagnosis of hypogonadism with documented low testosterone levels on two separate tests. Without insurance, expect to pay for both the pellets themselves and the office procedure fee, which together can run several hundred dollars per insertion cycle.
Some clinics offer compounded testosterone pellets, which are custom-made by specialty pharmacies rather than manufactured by Testopel’s maker. Compounded pellets may cost less, but they are not FDA-approved and may vary in quality and consistency. The only FDA-approved testosterone pellet product in the United States is Testopel.