Written by Keen Meds  ·  Reviewed by Licensed Clinical Providers  ·  March 1, 2026

Key Insight: Pellet implants are not reversible mid-cycle -- if levels run high or side effects emerge, dose cannot be adjusted until pellets dissolve (3-6 months). Spray dose can be adjusted immediately.

> Pellet implants are not reversible mid-cycle -- if levels run high or side effects emerge, dose cannot be adjusted until pellets dissolve (3-6 months). Spray dose can be adjusted immediately.

Medically reviewed by licensed clinical providers · March 2026

Among the available testosterone delivery methods, pellets and transdermal spray represent two opposite ends of the convenience-control spectrum. Pellets offer a set-and-forget approach -- a minor procedure every few months, no daily administration required. Transdermal spray requires a brief daily routine but gives the prescribing provider (and the patient) immediate control over dose. Neither is universally superior. The right choice depends on what matters most to the individual patient. Here is an honest, factual comparison of both.

How Testosterone Pellets Work

Testosterone pellets are small crystalline cylinders, each about the size of a grain of rice, containing compressed testosterone. They are implanted subcutaneously -- typically in the upper buttock or flank -- under local anesthesia via a minor in-office procedure. Once implanted, they dissolve slowly, releasing testosterone at a relatively consistent rate over 3--6 months (the range varies by the number of pellets, patient metabolism, and activity level).

The testosterone released from pellets is bioidentical and enters the bloodstream through direct subcutaneous absorption, bypassing the gastrointestinal system and first-pass hepatic metabolism. Levels after pellet implantation tend to be relatively stable compared to weekly injections -- though there is typically a brief higher-level period in the first few weeks after insertion followed by a gradual decline as pellets dissolve.

Pellets are not available through retail pharmacies. They are implanted by trained providers -- typically through specialty hormone clinics or some men's health practices -- and are usually not covered by insurance, making them an out-of-pocket expense.

How Testosterone Spray Works

Transdermal testosterone spray is applied directly to the skin -- typically on the shoulders, upper arms, or inner thighs -- and absorbed transdermally into the bloodstream. Keen's Testosterone Spray Rx uses Hypospray®, a needle-free transdermal delivery platform that applies prescription testosterone to the skin without any injection or implantation procedure.

Application takes approximately 30 seconds. Because it is applied daily, it closely mirrors the body's natural testosterone rhythm -- levels are replenished each morning and gradually decline across the day. The daily application schedule allows for straightforward dose adjustment at any point: increase, decrease, or pause as directed by the prescribing provider based on lab results.

Transdermal testosterone spray requires a prescription and periodic lab monitoring, the same as any other testosterone formulation.

Absorption and Level Consistency

Both methods deliver bioidentical testosterone, but their absorption profiles differ.

Pellets produce relatively stable levels across the implantation period, avoiding the pronounced peak-and-trough pattern associated with weekly or biweekly injections. However, there is meaningful patient-to-patient variability in how quickly pellets are metabolized. Active men with higher muscle mass may dissolve pellets faster than sedentary men, leading to a shorter effective period and variable timing for re-implantation. Some men experience elevated levels -- above therapeutic range -- in the first 4--6 weeks after implantation, which can produce side effects.

Transdermal spray provides predictable daily level maintenance when applied consistently. Because absorption rates through the skin vary somewhat between individuals, the initial calibration period (typically the first lab check at 3 months) allows the provider to adjust the prescription dose based on measured serum levels. Once the correct dose is established, daily application produces consistent levels within the therapeutic range.

From a clinical management perspective, daily transdermal delivery makes it easier to respond to lab results -- whether levels are too high, too low, or the patient is experiencing polycythemia. The prescribing provider can adjust immediately. With pellets, the only option is to wait.

The Reversibility Issue

This is the most clinically significant practical difference between pellets and spray, and it deserves direct attention.

If a man on pellet therapy experiences side effects -- elevated hematocrit (polycythemia), mood changes, unwanted effects from supraphysiologic levels, or a change in medical circumstances that makes TRT inadvisable -- there is no mechanism for dose reduction or cessation until the pellets dissolve. That can be 3--6 months. The provider and patient can only monitor and manage symptoms as best they can while waiting.

This is not a hypothetical concern. Hematocrit rises are more likely if pellets deliver levels above the therapeutic range. Managing hematocrit elevation (through phlebotomy) while pellets are still active is a real clinical scenario for some patients.

With transdermal spray, stopping or reducing the dose is immediate. The prescribing provider adjusts the prescription. The patient applies a lower dose or pauses entirely. Testosterone levels decline within days to weeks, and whatever side effect prompted the change begins to resolve. This degree of control matters -- particularly for men starting TRT for the first time, for men with higher cardiovascular risk, or for any man whose clinical circumstances might change during the treatment period.

The Minor Surgical Procedure

Pellet implantation requires a clinical visit, local anesthesia, an incision, and sterile technique. It is a minor procedure by surgical standards -- typically 15--20 minutes -- but it is not without procedural risks:

  • Pellet extrusion: Occurs in approximately 2--3% of implantations. A pellet that migrates toward the surface of the skin and extrudes must be managed clinically.
  • Infection risk: As with any incision, though uncommon with proper technique.
  • Hematoma or bruising: Minor in most cases but occasionally significant.
  • Procedural discomfort: Some men find the local anesthetic injection or post-procedure soreness more bothersome than expected.

None of these are frequent or severe complications in experienced hands. But they are real considerations for men who are choosing between a daily non-invasive application and a periodic minor procedure.

Convenience: Two Different Models

"Convenience" means different things to different people.

Pellets: Convenient in the sense that once implanted, no action is required for months. Men who have strong daily routine variability -- heavy travel, unpredictable schedules -- may find the no-daily-dose model appealing. The downside is the time cost of clinic visits 3--4 times per year for re-implantation, plus the procedure itself.

Spray: Convenient in the sense that it fits into a daily morning routine with minimal effort -- approximately 30 seconds of application to the skin. No clinic visits for the medication administration itself, though periodic telehealth check-ins and lab panels are part of the monitoring protocol. For men who prefer managing their own health routine at home, daily transdermal application may feel more natural.

Cost Comparison

Pellet implantation typically costs $300--600 per procedure, depending on the provider and number of pellets. With 3--4 procedures per year, annual cost is commonly in the range of $900--2,400. This is almost universally an out-of-pocket expense, as insurance rarely covers pellets. Additional monitoring labs may be billed separately.

Keen's Testosterone Spray Rx program is $229/month (monthly plan) or $199/month on the 3-month plan ($599 upfront). This includes the prescription and clinical oversight, with lab monitoring factored into the program structure. Annual cost on the monthly plan is approximately $2,748 -- comparable to pellet therapy at the mid-to-high cost range, and more affordable than pellets at the high end.

Who Pellets May Be Right For

Pellet therapy has genuine advantages for a specific type of patient: men who have already calibrated their ideal testosterone level and dose, who struggle with daily routine adherence, and who do not require frequent dose adjustments. Men who have been on pellet therapy for several years and have a stable, predictable implantation schedule may find the routine comfortable.

Pellets are a less appropriate choice for men who are new to TRT (where dose calibration is still in progress), men with higher cardiovascular risk (where immediate response to polycythemia is valuable), or men whose medical circumstances are in flux.

Who Spray Is Better For

Transdermal spray is well-suited for men who value dose control and flexibility, men who are new to TRT and working through the calibration period, men with higher monitoring requirements, and men who prefer non-invasive medication administration. The daily routine is brief and integrates easily into a morning schedule. The ability to adjust dose based on lab results without waiting months for the previous dose to clear is a meaningful clinical advantage.

Frequently Asked Questions

Can I switch from pellets to spray?
Yes, but timing matters. Switching from pellets to spray while pellets are still active would result in additive testosterone exposure, which could push levels above the therapeutic range. The standard approach is to allow pellets to complete their cycle (or near-completion, confirmed by a lab level check) before initiating transdermal therapy. A prescribing provider can advise on the appropriate timing.

Do pellets produce better absorption than spray?
Both methods deliver bioidentical testosterone into the bloodstream. The absorption mechanism differs -- pellets dissolve subcutaneously, spray absorbs transdermally -- but neither is inherently superior in terms of delivering testosterone to target tissues. What differs is the consistency and controllability of the resulting levels. Individual absorption rates vary for both methods, which is why lab monitoring is standard regardless of delivery form.

Is testosterone spray available through insurance?
Coverage for compounded transdermal testosterone varies by insurance plan. Many plans cover FDA-approved testosterone formulations partially; compounded preparations are less consistently covered. Keen's Testosterone Spray Rx is structured as a direct-pay telehealth program. Men who already have insurance coverage for testosterone and want to use it should discuss options directly with their insurer and prescribing provider.

Compare Your Options with a Clinical Team

The right delivery method depends on your medical history, lifestyle, and preferences. A licensed clinical provider can help you evaluate the options in the context of your specific situation.

Keen Meds connects you with a licensed clinical team for a telehealth consultation and lab review. If your testosterone is clinically low, you receive a prescription for Testosterone Spray Rx -- delivered via Hypospray®, Keen's needle-free transdermal spray platform.

Start your Keen Testosterone Spray Program →

Medically reviewed by Licensed Clinical Providers · March 2026

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