Types of Testosterone Replacement Therapy: Injections, Gels, Patches, Pellets, and More Compared

Seven delivery methods exist for testosterone replacement therapy, and the differences between them are more clinically significant than most articles let on. The right choice depends on your hematocrit, your schedule, whether you have young children at home, and whether you can accept a locked-in dose for up to six months at a time. This guide covers every type of testosterone replacement therapy available in the U.S. — how each one works, what the clinical comparison data actually shows, what each costs per month, and which type fits which situation.

TRT Delivery Methods at a Glance

Types of testosterone replacement therapy refer to the different delivery systems used to restore testosterone to normal physiological range in men with confirmed hypogonadism. Each method — injections, topical gels, transdermal patches, subcutaneous pellets, oral capsules, and nasal gel — delivers the same hormone but differs in how it enters the bloodstream, how stable the resulting hormone levels are, and how much it costs.

Delivery Method	Frequency	Est. Monthly Cost	Hormone Stability	Erythrocytosis Risk	Transference Risk	Dose Adjustable?
IM Injection (cypionate/enanthate)	Every 1–2 weeks	$20–$100	Peaks and troughs	High (66.7%†)	None	Yes
SubQ Injection	Weekly	$20–$100	More stable than IM	Similar to IM	None	Yes
Topical Gel/Cream	Daily	$30–$500	Stable	Low (12.8%†)	Yes (until dry)	Yes
Transdermal Patch	Daily	$150–$300	Stable	Low	Minimal	Yes
Subcutaneous Pellets	Every 3–6 months	$175–$500 equiv.	Very stable	Moderate (35.1%†)	None	No — locked
Oral Capsules (Jatenzo/Kyzatrex)	Twice daily	$100–$300	Stable	Low	None	Yes
Nasal Gel (Natesto)	3× daily	$200–$400	Variable	Low	None	Yes

†Erythrocytosis rates (hematocrit ≥50%) from a 178-patient retrospective study comparing formulations over 26 months (Bhatt et al., 2019, PMC4599554).

If you are new to TRT and want to understand how diagnosis works before comparing delivery options, see our complete guide to testosterone replacement therapy first.

Testosterone Injections: The Most Prescribed Form of TRT

Injections account for over 70% of TRT prescriptions in the United States, driven primarily by cost and effectiveness. Two ester forms — testosterone cypionate and testosterone enanthate — make up the vast majority of those prescriptions. A third injectable form, testosterone undecanoate (Aveed), is available for patients who cannot tolerate frequent dosing.

Intramuscular Injections

Intramuscular (IM) testosterone is injected directly into a large muscle group — typically the gluteus, vastus lateralis (outer thigh), or deltoid. Testosterone cypionate and enanthate are typically administered every one to two weeks. Testosterone undecanoate (Aveed) is a long-acting formulation given every ten weeks but must be administered in a certified healthcare setting due to the risk of pulmonary oil microembolism — a rare but serious reaction that can occur within 30 minutes of injection.

The main clinical tradeoff with standard IM injections is the peak-and-trough pattern. Levels spike within 24–72 hours of injection, then decline progressively until the next dose. For men sensitive to these fluctuations, this can translate to noticeable energy and mood changes in the days before the next shot is due. Splitting the dose to weekly injections reduces this effect.

Subcutaneous Injections

Subcutaneous (SubQ) testosterone uses a shorter, thinner needle to inject into the fatty tissue under the skin — usually the abdomen or lateral thigh — rather than into muscle. The same testosterone cypionate or enanthate is used, but the slower absorption from subcutaneous tissue produces more stable serum levels than standard IM administration.

SubQ is technically an off-label injection route for most testosterone products, but it is increasingly prescribed, particularly by telehealth TRT providers. Many men who switched from IM to SubQ report less post-injection discomfort and fewer mid-cycle energy fluctuations. The needle length is typically 5/8 inch compared to 1–1.5 inches for IM.

The Erythrocytosis Risk in Injections

The most clinically significant concern with injectable testosterone is erythrocytosis — an abnormal increase in red blood cell production that raises the risk of blood clots. A 2019 retrospective study of 178 hypogonadal men followed for 26–30 months found erythrocytosis (hematocrit ≥50%) occurred in 66.7% of men on injectable testosterone, compared to 35.1% on pellets and 12.8% on gels. This difference is substantial and warrants regular hematocrit monitoring — typically every three months in the first year of injection therapy.

Men with pre-existing cardiovascular risk factors, history of polycythemia, or sleep apnea should discuss this erythrocytosis differential with their prescribing physician before defaulting to injections based on cost alone. For a full breakdown of TRT side effects and how to manage them, including polycythemia management protocols, see our guide to testosterone replacement therapy side effects.

Injections: Pros

• Lowest monthly cost ($20–$100 for generic cypionate)
• Most prescribed and best-documented in long-term studies
• Dose can be adjusted up or down in days
• Self-injectable at home (IM or SubQ)
• Fastest symptom relief — typically 7–14 days

Injections: Cons

• Peak-and-trough hormone fluctuations with standard IM dosing
• Highest erythrocytosis risk (66.7% in comparative study)
• Requires willingness to inject or arrange regular clinic visits
• Testosterone undecanoate must be administered in a clinical setting

Testosterone Gels and Creams: Daily Application With Stable Levels

Topical testosterone gels — sold under brand names including AndroGel, Testim, Fortesta, Vogelxo, and Axiron — are applied once daily to the shoulders, upper arms, or abdomen. The testosterone is absorbed through the skin and enters the bloodstream gradually, producing stable serum levels without the peak-and-trough pattern seen with injections.

Absorption is highly individual. Two men using the same daily dose of AndroGel can achieve meaningfully different serum testosterone levels, which means dose titration typically requires more trial and adjustment with gels than with injections. Skin characteristics, body hair density, and application consistency all influence how much testosterone actually enters circulation.

Transference Risk

Topical testosterone gels carry a real transference risk — testosterone can be transferred to women and children through direct contact with uncovered application sites before the gel fully dries. Reported cases of virilization in female partners and prepubertal children have been documented following unprotected skin-to-skin contact.

Practical mitigation steps: wash hands thoroughly after applying; cover the application site with clothing; avoid skin-to-skin contact with the area for at least 2 hours after application. These steps substantially reduce (but do not eliminate) transference risk. Men with infants or young children who regularly make contact with their upper body should discuss this risk explicitly with their provider.

Gel Cost

Brand-name gels such as AndroGel 1.62% can cost $400–$500 per month without insurance coverage. Generic testosterone gel is available for $30–$80 per month at many pharmacies, making cost-conscious gel use possible. Compounded testosterone cream from a compounding pharmacy typically costs $50–$150/month but requires a provider relationship with a compounding-friendly prescriber.

Gels and Creams: Pros

• Stable daily testosterone levels without injections
• No needles — preferred by needle-averse men
• Easy at-home self-administration
• Lowest erythrocytosis risk (12.8% in comparative study)
• Dose adjustable

Gels and Creams: Cons

• Must apply daily without missing doses
• Transference risk to household contacts
• Variable skin absorption — harder to dial in than injections
• Brand-name versions are significantly more expensive than generic injectable
• Skin irritation at application site in some users

Testosterone Patches: Consistent Delivery Without Daily Rubbing

Transdermal patches deliver testosterone through the skin continuously over 24 hours. The primary product available in the U.S. is Androderm, applied once daily — typically between 8 p.m. and midnight — to the upper arms, thighs, abdomen, or back. The evening application timing reflects normal circadian testosterone patterns, with levels peaking during sleep.

Patches avoid the transference concerns of gels because the testosterone is contained within the patch matrix rather than spreading across the skin surface. However, skin irritation at the application site is a significant real-world limitation — clinical trials reported itching or mild to moderate skin reactions in up to 48% of patients using Androderm.

Rotating application sites and applying a corticosteroid cream to the site before patch placement can reduce irritation. Men who develop persistent skin reactions typically switch to a different delivery method.

Patches typically achieve lower peak testosterone levels compared to injections, making them less suitable for men with significantly suppressed baseline testosterone who require aggressive dose titration.

Patches: Pros

• Eliminates transference risk vs. gels
• Stable, once-daily delivery
• No needles required
• Mimics natural daily testosterone rhythm when applied in evening

Patches: Cons

• Skin irritation at application site (up to 48% in clinical trials)
• Lower peak levels than injections
• Must rotate sites to reduce skin reactions
• More expensive than injectable testosterone
• Can loosen with sweating or water exposure during exercise

Testosterone Pellets: Long-Term Convenience With One Important Tradeoff

Testosterone pellets (Testopel is the primary commercially available brand) are rice-grain-sized cylinders of crystalline testosterone implanted under the skin, typically in the upper buttocks, during a brief in-office procedure. The procedure takes roughly 15 minutes: the area is numbed, a small incision is made, and 10–12 pellets are inserted using a trocar. The incision is closed with adhesive strips — no stitches required. Pellets dissolve gradually and release testosterone steadily over three to six months. This produces some of the most physiologically stable testosterone levels of any delivery method — no daily applications, no weekly injections, no peaks and troughs.

The Dose Lock Limitation

The convenience of pellets comes with one clinically important constraint: once inserted, the dose cannot be changed until the pellets dissolve. If your testosterone levels come in too high, causing side effects like elevated hematocrit, mood disturbance, or excessive estradiol conversion — or too low, providing inadequate symptom relief there is no option to adjust. You wait.

For men starting TRT for the first time, this makes pellets a risky first choice. Providers who use pellets extensively typically recommend establishing your effective dose range with injections or gel first, then transitioning to pellets once the optimal dose is confirmed.

Pellet Complications

Pellet extrusion where a pellet works its way back through the insertion site occurs in an estimated 5–10% of insertions. Infection at the insertion site, while uncommon, is a recognized risk of any subcutaneous procedure. The 2019 comparative study found erythrocytosis in 35.1% of pellet users, intermediate between injections (66.7%) and gels (12.8%). Pellets are not the low-erythrocytosis option that some clinics marketing them imply.

Pellets: Pros

• One procedure every 3–6 months — highest convenience once dose is established
• Very stable hormone levels without daily or weekly effort
• No transference risk
• No needles after insertion

Pellets: Cons

• Dose cannot be adjusted once inserted — locked until pellets dissolve
• Requires in-office procedure with associated infection/extrusion risk
• Higher erythrocytosis rate (35.1%) than gels
• Insurance often does not cover pellet insertion
• Higher monthly equivalent cost ($175–$500) vs. injectable
• Not suitable as a first-line choice for new TRT patients

Oral Testosterone Capsules: The Newest TRT Option With a Different Absorption Route

Three oral testosterone products have received FDA approval in the U.S.: Jatenzo (testosterone undecanoate capsule), Kyzatrex (testosterone undecanoate), and Tlando (testosterone undecanoate). All three are taken with a meal, twice daily.

These formulations are not the same as older oral testosterone preparations. Methyltestosterone — the original oral testosterone form used through the 1990s — caused significant hepatotoxicity (liver damage) because it was metabolized through the liver. The new oral testosterone undecanoate capsules avoid this problem through a different absorption pathway: the testosterone is absorbed through the intestinal lymphatic system, bypassing first-pass hepatic metabolism entirely. This is why they must be taken with a meal that contains some dietary fat — fat triggers bile secretion and lymphatic absorption.

Jatenzo carries a black box warning regarding blood pressure elevation and is not recommended for men with hypertension that is difficult to control. Kyzatrex and Tlando have similar cardiovascular monitoring requirements. Providers prescribing oral testosterone should monitor blood pressure in the first three to six months.

Oral Testosterone: Pros

• No needles, no skin applications, no procedure
• Good hormone stability with twice-daily dosing
• Suitable for men who find topical products impractical

Oral Testosterone: Cons

• Must be taken twice daily with a fat-containing meal — easy to miss
• Black box warning on blood pressure elevation (Jatenzo)
• Less long-term outcome data than injections or gels
• Not appropriate for men with poorly controlled hypertension
• Monthly cost higher than generic injectable testosterone

Nasal Testosterone Gel (Natesto): Three Times Daily, With a Fertility Advantage

Natesto is a testosterone gel delivered intranasally via a metered-dose pump, providing 5.5 mg of testosterone per nostril per dose. It is used three times daily, roughly 6–8 hours apart. Serum testosterone levels peak approximately 40 minutes after application and return to baseline within 6 hours — which is why three applications daily are necessary to maintain adequate levels throughout the day.

The Fertility Consideration

Natesto is the only currently available TRT formulation with published evidence suggesting reduced suppression of the hypothalamic-pituitary-gonadal axis compared to other methods. Studies have shown that Natesto, due to its shorter half-life and pulsatile absorption pattern, produces less sustained LH and FSH suppression than gels or injections — meaning some residual sperm production may be preserved in men using Natesto.

This does not mean Natesto is a fertility-safe TRT option. Men who wish to preserve fertility should discuss the full picture — including HCG co-therapy, clomiphene, and Natesto as potential strategies — with a reproductive endocrinologist or urologist before starting any TRT form. See our guide to TRT and fertility for a complete breakdown of fertility-preservation strategies.

Nasal Testosterone: Pros

• No skin transference risk
• No needles or patches
• Less LH/FSH suppression than other forms — partial fertility preservation advantage
• Dose adjustable

Nasal Testosterone: Cons

• Three applications daily is the highest administration burden of any TRT form
• Nasal side effects: rhinorrhea, nasal discomfort, epistaxis (nosebleed) reported in some users
• Variable absorption — levels peak and decline rapidly between doses
• Less long-term efficacy and safety data than injections or gels
• Not appropriate for men with chronic nasal conditions or active rhinitis
• Sneezing after application can reduce the dose delivered

How the Types of Testosterone Replacement Therapy Compare on What Actually Matters

Erythrocytosis Risk

The most clinically differentiated dimension across types of testosterone replacement therapy is erythrocytosis risk. A retrospective study following 178 hypogonadal men for 26–30 months found:

• Injectable testosterone: 66.7% developed erythrocytosis (hematocrit ≥50%)
• Pellets: 35.1%
• Gels: 12.8%

These are not marginal differences. Erythrocytosis is a known risk factor for venous thromboembolism — pulmonary embolism and deep vein thrombosis. Men with pre-existing cardiovascular risk factors, obstructive sleep apnea, a history of blood clots, or those who smoke are at heightened risk and should weight this data heavily in their delivery method decision. Regular hematocrit monitoring is mandatory regardless of delivery method. Frequency guidelines from the American Urological Association recommend testing at 3 months, 6 months, and then annually once stable.

Cost

Method	Monthly Cost Range	Notes
IM/SubQ injection (generic cypionate)	$20–$100	Cheapest option; widely covered by insurance
Topical gel (generic)	$30–$80	Brand-name gel ($400–$500) dramatically more expensive
Oral capsules	$100–$300	Less commonly covered by insurance
Transdermal patch (Androderm)	$150–$300	Limited generic availability
Nasal gel (Natesto)	$200–$400	Rarely generic; coverage varies
Pellets (Testopel)	$175–$500 equivalent/month	Per-insertion cost $350–$1,000; 2–4 insertions/year; often not covered

For a comprehensive breakdown including telehealth pricing and insurance coverage details, see our guide to TRT costs.

Dose Flexibility

All methods except pellets allow straightforward dose adjustment — either increasing or decreasing testosterone at the next fill or application. Pellets lock in the dose for the duration of the implant cycle (3–6 months). This is not a minor inconvenience; it is a structural constraint that matters most when starting TRT for the first time or when monitoring reveals labs outside target range.

Lifestyle Burden

• 3× daily: Natesto
• Daily: Gels, creams, patches
• Weekly: SubQ injections
• Every 1–2 weeks: Standard IM injections
• Every 10 weeks: Testosterone undecanoate (IM, clinic-only)
• Every 3–6 months: Pellets (one in-office procedure)
• Twice daily with meals: Oral capsules

Which Type of Testosterone Therapy Is Right for Your Situation

Scenario 1: You want the lowest possible cost and are comfortable with needles: Intramuscular or subcutaneous testosterone cypionate or enanthate is the standard choice. Weekly SubQ injections provide more stable levels than biweekly IM with the same cost profile ($20–$100/month generic). Monitor hematocrit at 3-month intervals given the elevated erythrocytosis risk.

Scenario 2: You will not inject yourself and the idea of needles is non-negotiable: Generic topical gel or cream is your starting point daily application, stable levels, no needles. If skin irritation or application logistics are a problem, oral testosterone capsules offer a needle-free alternative with good stability. Patches are an option but carry a higher skin irritation rate.

Scenario 3: You have young children at home who regularly make physical contact with your upper body: The transference risk from gels and creams is a genuine concern in this scenario. Patches, injections, pellets, oral capsules, and nasal gel all eliminate transference risk. If cost is a factor, injections remain the best-value transference-free option. Patches or oral testosterone are the practical needle-free, transference-free choices.

Scenario 4: You travel frequently and cannot commit to a consistent weekly injection or daily application schedule: Testosterone pellets are worth serious consideration — once the dose is established, a single insertion covers three to six months with no daily or weekly action required. Confirm your optimal dose range with injections first before switching to pellets to avoid the dose-lock problem. Testosterone undecanoate injection (Aveed, clinic-administered every 10 weeks) is an alternative that avoids the insertion procedure.

Scenario 5: You are of reproductive age and have not yet ruled out future fatherhood: This is the most nuanced scenario in all of TRT. All standard TRT forms suppress LH, FSH, and sperm production. Natesto offers the best evidence for partial LH/FSH preservation, but is not a guarantee of maintained fertility. HCG co-therapy alongside TRT is a more reliable fertility-preservation strategy. A 40-year-old man weighing TRT against a planned second child should consult a reproductive urologist before starting any form of TRT rather than relying on delivery method selection alone. See our guide to TRT and fertility for the full treatment picture.

Scenario 6: You want maximum convenience and long-term stability once your dose is established: Pellets with the important caveat that they require dose confirmation beforehand. Men who have been on injection or gel-based TRT for 6–12 months, whose labs are consistently within target range, and who want to eliminate ongoing administration burden are good pellet candidates. New TRT patients should not start with pellets.

What Most Men Get Wrong When Choosing a TRT Delivery Method

1. Choosing pellets for convenience without understanding the dose-lock consequence: Convenient” is accurate — six months without injections or daily applications is genuinely easy. What pellet marketing materials underemphasize is that once those pellets are under your skin, your dose is set until they dissolve. If your provider miscalculates and your levels come in at 1,200 ng/dL instead of the target 600–800 ng/dL range, you will experience the side effects of that over-dose for months with no recourse. First-time TRT patients should establish their dose with an adjustable method before committing to pellets.

2. Choosing injections purely for cost without factoring in erythrocytosis monitoring costs: Injectable testosterone cypionate costs $20–$40/month at most pharmacies. That figure looks highly compelling compared to $300+ for brand-name gel. What it doesn’t account for is the elevated erythrocytosis risk — 66.7% in comparative data — and the associated monitoring required (blood draws every 3 months in year one, potential phlebotomy if hematocrit exceeds 54%). Men with multiple cardiovascular risk factors may find the total cost picture less favorable after factoring in monitoring frequency.

3. Assuming testosterone gel absorption is consistent: Gel absorption varies significantly person to person — and in the same person under different conditions (skin hydration, body temperature, application site hair density). Men who try gel at a given starting dose and see minimal testosterone level improvement should not assume the therapy isn’t working; they may simply be poor absorbers. This is a dose-titration problem, not a therapy failure problem. It does mean gel requires more blood work in the initial titration phase than injections.

4. Underestimating the 3× daily commitment of Natesto: Nasal gel’s fertility preservation advantage is real and clinically relevant for men of reproductive age. But the 3×-daily application schedule is the highest administration burden of any TRT form — and nasal discomfort, including rhinorrhea and epistaxis, is a documented side effect. Men who miss doses frequently will get erratic levels, which defeats the purpose. Honest assessment of adherence pattern is needed before choosing Natesto.

Frequently Asked Questions About TRT Types

What is the most common form of testosterone replacement therapy?

Intramuscular testosterone injections — primarily testosterone cypionate and testosterone enanthate — account for more than 70% of TRT prescriptions in the United States. Their dominance reflects cost, dosing flexibility, and decades of clinical familiarity. Topical gels are the second most common form.

Which type of testosterone therapy has the fewest side effects?

No single delivery method is side-effect-free, but topical gels have the lowest rate of erythrocytosis (12.8% in comparative data versus 66.7% for injections) and avoid the procedural risks of pellets. Gels do carry transference risk and variable absorption, which are their own management concerns. The “fewest side effects” designation depends on which side effects matter most in a given patient’s profile.

Can you switch from one type of TRT to another?

Yes. Switching between delivery methods is common and straightforward for most methods — gels to injections, injections to patches, patches to oral. The exception is pellets: once inserted, they cannot be removed short of a second surgical procedure. Before switching, confirm the new formulation and dose with your provider, and plan for a lab draw 6–8 weeks after transition to verify that levels are in range.

Is testosterone gel as effective as injections?

Gels and injections both raise serum testosterone into the normal physiological range and improve hypogonadism symptoms when dosed correctly. Injectable testosterone typically achieves higher peak levels, which may benefit men requiring aggressive dose titration. Gels produce more stable baseline levels without the injection peaks. A 2019 comparative study found all three major formulations (gels, injections, pellets) produced sustained testosterone elevation throughout follow-up — the difference is in the stability and safety profile of that elevation, not whether elevation occurs.

How long do testosterone pellets last before they need to be replaced?

Testopel pellets typically release testosterone for three to six months before fully dissolving. The duration varies based on the number of pellets inserted (usually 10–12 for most men), individual metabolic rate, and activity level. Men with higher physical activity levels tend to absorb pellets faster, sometimes requiring re-implantation at the three-month mark rather than six.

Can testosterone replacement therapy be done at home without clinic visits?

Intramuscular and subcutaneous injections can be self-administered at home after an initial provider training session. Gels, patches, oral capsules, and nasal gel are all home-use methods by design. The only TRT forms requiring clinical administration are testosterone undecanoate injection (Aveed, due to post-injection reaction monitoring requirements) and pellet insertion. Telehealth TRT providers have made home-based injection and gel therapy accessible without regular in-person clinic visits for men who meet the eligibility criteria.

What is subcutaneous testosterone injection and how does it differ from intramuscular?

Subcutaneous (SubQ) injection delivers testosterone into the fatty tissue just under the skin using a short, fine-gauge needle (typically 5/8 inch, 25–27 gauge) rather than into muscle. The same testosterone compounds are used — typically cypionate or enanthate. SubQ absorption is slower, which tends to produce more stable serum levels than standard intramuscular dosing. SubQ is technically an off-label injection route for most testosterone products but is widely prescribed, particularly in the telehealth TRT space, because many patients find it easier to self-administer and less painful than intramuscular injection.

How much does each type of testosterone replacement therapy cost per month?

Generic injectable testosterone cypionate is the least expensive at $20–$100/month. Generic topical gel ranges from $30–$80/month; brand-name gels (AndroGel, Testim) can reach $400–$500/month without insurance. Oral testosterone capsules run $100–$300/month. Patches typically cost $150–$300/month. Nasal gel (Natesto) runs $200–$400/month. Pellets cost $350–$1,000 per insertion, with 2–4 insertions per year — the monthly equivalent ranges from $175 to $500 or more. Insurance coverage varies significantly by formulation and plan; pellet insertion is frequently not covered.

Choosing Well Before You Start

Before your next appointment, use the scenario guide in this article to identify which delivery method fits your lifestyle and health profile — then bring that shortlist to your prescribing physician or TRT specialist and ask them to cross-reference it against your baseline labs, hematocrit level, and any cardiovascular risk factors. That one conversation shortens the trial-and-error period significantly.