Almost every conversation about testosterone replacement therapy focuses on the wrong question. Men ask "should I do TRT?" long before they ask "how should the testosterone get into my body?" — and the second question is the one that determines what daily life on therapy actually feels like, how stable your labs are, what side effects you deal with, and whether you are still on therapy two years from now.
There are three delivery methods that account for the overwhelming majority of prescriptions in the United States: intramuscular or subcutaneous injections, FDA-approved transdermal gels, and compounded transdermal creams. All three can put a hypogonadal man into a healthy testosterone range. They do it with very different pharmacokinetics, very different failure modes, and very different demands on your routine.
This guide compares all three head to head. If you only want the two-way comparison, we have a shorter piece on testosterone gel vs injections. This article adds cream — which most clinics skip entirely, and which is often the best answer for the men who dislike both of the other options.
Injections give the most predictable blood levels for the least money, and are the default at most modern clinics. Gel is the gentlest on-ramp with the most regulatory oversight, but has real transference risk and fails to raise levels adequately in a meaningful minority of men. Compounded cream sits in between: daily dosing, no transference to a partner if applied to covered skin, strong absorption when applied to scrotal skin, and a tendency to raise DHT more than the other two.
The Three Methods at a Glance
| Factor | Injections | Gel | Cream |
|---|---|---|---|
| Typical frequency | 1–2x weekly (some daily) | Daily, morning | Daily, morning (sometimes 2x) |
| Regulatory status | FDA-approved (cypionate, enanthate) | FDA-approved (1%, 1.62%, 2%) | Compounded by a 503A/503B pharmacy |
| Blood level pattern | Peak/trough across the week | Daily peak, near-flat weekly | Daily peak, near-flat weekly |
| Dose actually absorbed | Essentially all of it | Roughly 10% of applied dose | Higher than gel; much higher on scrotal skin |
| Transference to others | None | Real risk — boxed warning | Lower, but still possible |
| Effect on DHT | Modest rise | Moderate rise | Largest rise, especially scrotal |
| Cost sensitivity | Cheapest per month | Most expensive without insurance | Mid-range |
| Best for | Stable levels, low cost, high-dose needs | Avoiding injections with brand-name assurance | Avoiding injections with better absorption |
How Each One Actually Works
1Injectable testosterone esters
Testosterone cypionate and enanthate are testosterone molecules bonded to a fatty acid chain and suspended in oil. That chain is what makes them long-acting: once the oil sits in muscle or subcutaneous fat, it forms a depot that releases testosterone gradually while enzymes cleave the ester off. Cypionate has a half-life of roughly eight days; enanthate is slightly shorter. We break down the difference in cypionate vs enanthate.
Because nothing is lost to skin or gut, dose-to-serum response is remarkably predictable. Give two men the same weekly milligram dose and their levels will land in a similar neighborhood, adjusted for body composition and SHBG. That predictability is why injections dominate: a clinician can titrate confidently and hit a target range in one or two adjustments.
The trade-off is the shape of the curve. A single weekly dose produces a peak two to three days later and a trough right before the next one, and some men feel that swing as a mid-week dip in energy and mood. Splitting the same weekly total into two or three smaller doses flattens the curve substantially, which is why most clinics now default to twice-weekly. See our TRT dosing guide for how those schedules are built.
2Transdermal gel
Gels are alcohol-based hydroalcoholic solutions of unmodified testosterone, applied once daily to shoulders, upper arms, or abdomen depending on the product. The alcohol evaporates in minutes, leaving testosterone in the outer skin layers, which then act as a slow-release reservoir feeding into the bloodstream over the following 24 hours.
The inefficiency is the headline number: roughly 10% of the applied dose reaches circulation. A 50 mg packet delivers something like 5 mg systemically. That is not a flaw so much as a design constraint of pushing a steroid through intact skin, but it explains why gel doses look enormous next to injectable doses and why gel is the most expensive option per unit of testosterone delivered.
Gel's advantage is the curve. Daily dosing produces near-flat week-to-week levels with no trough to ride out, and levels track closely to what a healthy man's own production looks like across a day. It is also the most heavily studied option, with FDA-approved labeling, standardized concentrations, and pharmacy-level consistency.
3Compounded transdermal cream
Cream uses the same unmodified testosterone but in an oil-and-water emulsion base rather than an alcohol gel. It is not a branded FDA-approved product; it is compounded to a prescribed concentration — commonly 100 to 200 mg per mL — by a compounding pharmacy. That means dosing is measured in fractions of a milliliter rather than fixed packets, and a provider can adjust the concentration itself, not just the volume.
Cream is absorbed more efficiently than gel, and dramatically more efficiently from scrotal skin, which is thin, highly vascular, and rich in the enzyme that converts testosterone to DHT. Published pharmacokinetic work on scrotal application found a 25 mg dose produced a peak in under three hours and held physiologic levels for roughly 16 hours (Andrology, 2017), and a documented case series recorded serum concentrations above 1,200 ng/dL two hours after scrotal application. Older comparative work found scrotal delivery required roughly a quarter of the daily dose of non-scrotal delivery to achieve comparable exposure.
The catch is the same enzyme density that makes scrotal skin efficient: DHT rises more on scrotal cream than on any other route. For a man worried about hair loss or an enlarging prostate, that matters.
What Your Blood Levels Actually Look Like
Delivery method determines the shape of your testosterone curve, and shape drives symptoms more than the average number does. Two men can have identical average testosterone and completely different experiences on therapy.
| Pattern | Once-weekly injection | Twice-weekly injection | Daily gel or cream |
|---|---|---|---|
| Time to peak | ~48–72 hours | ~24–48 hours | 2–6 hours |
| Peak-to-trough spread | Large | Moderate | Small week to week |
| Mid-week dip reported | Common | Uncommon | Rare |
| Missed-dose consequence | Gradual decline over days | Gradual decline | Levels drop within 24–48 hours |
| Lab timing matters | Critically — draw at trough | Yes — consistent day/time | Yes — before daily dose |
That last row causes more confusion than anything else in TRT. A total testosterone of 500 ng/dL means one thing at trough and something entirely different two hours after a scrotal cream application. If you switch methods and your numbers look wildly different, the first thing to check is when the blood was drawn. Our TRT bloodwork guide covers correct draw timing for each route, and free vs total testosterone explains why the total number alone is a poor guide.
Absorption Is the Deciding Variable for Topicals
The single biggest risk with any transdermal option is that it simply does not work well enough in you. Skin thickness, body fat, hydration, application site, ambient temperature, and how quickly you shower or sweat after applying all move absorption. A meaningful minority of men — commonly cited at roughly 5–10% for gels — are poor absorbers whose serum levels barely move despite perfect compliance.
You cannot predict this in advance. You find out at the 4-to-6 week lab check, which is exactly why that check is non-negotiable on a topical protocol. If your levels haven't moved meaningfully, the answer is usually not "try harder" — it is a higher concentration, a switch to scrotal application, or a switch to injections. A clinic that starts you on gel and doesn't recheck labs at six weeks is not managing your therapy; it is refilling a prescription.
Apply to clean, dry skin after showering, not before. Let it dry fully — three to five minutes — before dressing. Don't swim or shower for at least two hours. Rotate sites to avoid local saturation. Keep the timing consistent, because your lab result is only interpretable relative to your last dose.
Transference: The Risk Nobody Mentions Until It Happens
Transdermal testosterone can transfer from your skin to another person's skin. This is not theoretical — it is the basis of a boxed warning on every FDA-approved gel, added after reports of virilization in children exposed through secondary contact. Reported effects in exposed children have included premature pubic hair, accelerated bone age, and aggressive behavior; in adult women, acne, hair growth, and menstrual changes.
Injections carry zero transference risk. That fact alone decides the question for many men with young kids at home.
For topicals, transference is manageable but requires discipline: wash your hands immediately after applying, cover the site with clothing once dry, and avoid skin-to-skin contact at the application site until you have showered. Application site matters too — a shoulder that a toddler grabs is a higher-risk site than skin that stays covered all day. Scrotal cream application, whatever its other trade-offs, largely removes the incidental-contact pathway.
Side Effect Profiles Are Not Identical
All three routes share the core risk profile of testosterone therapy — we cover it fully in TRT side effects and is TRT safe?. But the routes differ in three specific ways worth knowing before you choose.
Hematocrit and red blood cells
Testosterone stimulates red blood cell production, and higher peaks appear to drive more of that stimulation. Injectable protocols with large weekly peaks are the most likely to push hematocrit into the range where a provider intervenes; flatter daily protocols tend to be gentler. This is one of the strongest clinical arguments for either splitting injection doses or choosing a topical. Details in hematocrit and TRT.
Estradiol conversion
Testosterone converts to estradiol via aromatase, largely in fat tissue. High-peak injectable protocols produce sharper estradiol spikes, which is where symptoms like water retention, moodiness, and breast tenderness usually come from. Flatter protocols generally produce steadier estradiol and less need for intervention. See estradiol on TRT and, if it's a specific worry for you, TRT and gynecomastia.
DHT
Here the ranking flips. Transdermal routes — and scrotal cream most of all — produce a proportionally larger rise in DHT than injections, because skin is rich in 5-alpha-reductase. DHT is the androgen most implicated in male pattern hair loss and in prostate tissue growth. If you have a strong family history of early balding, a topical applied to scrotal skin is the route most likely to accelerate it. Relevant reading: TRT and hair loss and TRT and prostate health.
In 2025 the FDA implemented class-wide labeling changes for testosterone products: the boxed warning about cardiovascular risk was removed following the TRAVERSE trial, and a new warning about increased blood pressure was added based on required ambulatory monitoring studies. This applies to every delivery route. Blood pressure should be measured before you start and monitored on therapy — see TRT and blood pressure and TRT and heart health.
Cost and Logistics
Without insurance, the ranking is consistent: injectable cypionate is the least expensive way to deliver a therapeutic dose, compounded cream sits in the middle, and brand-name gel is the most expensive — a direct consequence of that 10% absorption rate meaning you pay for ten times the testosterone you use. With insurance, the ranking can invert, because approved gels are covered on many formularies while compounded creams typically are not.
| Consideration | Injections | Gel | Cream |
|---|---|---|---|
| Cash cost per month | Lowest | Highest | Middle |
| Insurance coverage | Usually covered | Often covered | Rarely covered |
| Travel friendliness | Supplies + documentation needed | Easy, but volume-limited on flights | Easy |
| Daily time cost | Minutes, once or twice a week | ~5 min daily including dry time | ~5 min daily including dry time |
| Adherence failure mode | Skipping a scheduled dose | Forgetting a morning, showering too soon | Forgetting a morning |
For real numbers on what therapy costs at different clinics and how insurance interacts with it, see how much does TRT cost and TRT insurance coverage.
How to Choose: A Practical Framework
Work through these in order. The first one that clearly applies to you should dominate the decision.
| If this describes you | Start here | Why |
|---|---|---|
| You want the most predictable levels for the least money | Twice-weekly injections | Full bioavailability, flat curve, lowest cash cost |
| Young children or a pregnant partner at home | Injections | Eliminates transference risk entirely |
| You are firmly opposed to self-injecting | Cream over gel | Better absorption per dose, lower cost than brand gel |
| You need insurance to cover it | Gel or injections | Compounded cream is usually not covered |
| Strong family history of early hair loss | Injections | Smallest proportional DHT rise |
| Hematocrit already at the high end | Daily topical or split injections | Flatter peaks blunt red cell stimulation |
| You want to preserve fertility | Discuss alternatives first | All routes suppress your own production — see below |
| You travel constantly and unpredictably | Cream | Simplest to carry, no cold chain, nothing to refrigerate |
Every delivery method of exogenous testosterone suppresses the hormonal signal that drives your own production and sperm output. If you may want children, the conversation should start with whether testosterone is the right drug at all — enclomiphene vs TRT and TRT vs clomid cover the alternatives, and TRT and fertility covers protective add-ons.
Switching Between Methods
Nothing about this decision is permanent. Switching routes is routine, and a good clinic treats your first protocol as a starting hypothesis rather than a verdict. A few things to expect:
- Topical to injection: the transition is quick because the injectable depot builds within days. Expect a lab check at four to six weeks on the new dose.
- Injection to topical: slower and less predictable. The injectable ester clears over two to three weeks, and during that window it is hard to tell whether your topical absorption is adequate. Don't judge the new route until you have a clean lab drawn well after the last injection.
- Gel to cream (or vice versa): not a milligram-for-milligram swap. Absorption differs, and scrotal versus non-scrotal application differs even more. This always requires re-titration.
- Any switch: re-baseline hematocrit, estradiol, and blood pressure. The number that was stable on your old curve may not be stable on the new one.
For what the adjustment period feels like, see what to expect your first month on TRT and how long TRT takes to work.
Frequently Asked Questions
Is one method more effective than the others?
Not in terms of the end result. All three can restore testosterone to a healthy range and deliver the symptomatic benefits of therapy. The differences are in reliability of absorption, the shape of the curve, side effect emphasis, cost, and daily burden. The most effective method is the one you will still be using correctly a year from now.
Why do gel doses look so much larger than injectable doses?
Because only about a tenth of an applied transdermal dose reaches your bloodstream, while essentially all of an injected dose does. A 50 mg gel dose and a 5 mg systemic delivery are the same event described two ways.
Is compounded cream less safe because it isn't FDA-approved?
The testosterone molecule is identical; what differs is that the finished preparation is made by a compounding pharmacy rather than a branded manufacturer. That makes pharmacy quality genuinely important — ask which pharmacy your clinic uses, whether it is 503A or 503B, and whether potency testing is performed. It is one of the questions worth asking before you start.
Can I apply cream anywhere?
Application site changes the dose you effectively receive, so it should be prescribed, not improvised. Scrotal application is substantially more efficient and raises DHT more; upper-body application is less efficient and gentler on DHT. Switching sites without telling your provider is a common reason labs stop making sense.
Which method do most men end up on?
Injections, by a wide margin — driven by cost, predictability, and the absence of transference risk. But "most men" is not a clinical recommendation. Men who choose a topical and stay adherent generally do very well, and adherence beats theoretical optimality every time.
The Bottom Line
Choose injections if you want the most predictable, least expensive therapy and you are comfortable with a weekly or twice-weekly routine — this is the right answer for most men. Choose compounded cream if you want to avoid injections entirely and want better absorption economics than brand-name gel, accepting a larger DHT rise and daily discipline. Choose gel if you want an FDA-approved product your insurance will likely cover and you can manage transference precautions reliably.
Whatever you choose, the protocol matters more than the product: correct starting dose, labs at four to six weeks, blood pressure and hematocrit monitoring, and a provider willing to change course when the data says to. If you're still deciding whether therapy is right for you at all, start with should I start TRT? and the low testosterone symptoms checklist.
This article is for education and is not a substitute for individualized medical advice. Testosterone therapy requires a diagnosis of hypogonadism confirmed by laboratory testing and ongoing monitoring by a licensed clinician.