Testosterone injections vs gel vs pellets vs oral: how the options compare

No testosterone delivery method is best for everyone. Injections are the least expensive and most adjustable, gels give the steadiest day-to-day levels but can transfer to other people, pellets trade flexibility for convenience, and the newer oral capsules avoid needles and skin contact but need blood pressure monitoring. The right choice depends on your routine, your household, your budget and how your body responds.

Whatever the form, the goal is the same: bring testosterone back into the normal range in a man with confirmed hypogonadism, and keep it there without pushing hematocrit, blood pressure or estradiol into a problem range. The delivery method shapes how easy that is.

Injections

Testosterone cypionate and testosterone enanthate are oil-based injections used in the US for decades. They can be given into muscle or, increasingly, under the skin with a small needle. The Endocrine Society's 2018 guideline lists them among standard options.

What works well: low cost, easy dose changes, and no risk of transferring testosterone to a partner or child. Most men learn to self-inject after one or two supervised attempts.

What to watch: the classic every-two-weeks schedule produces a high level a couple of days after the shot and a low level before the next one. Some men feel that as a cycle of good days and flat days. Injections also tend to raise hematocrit more than gels do, which is why monitoring matters. Splitting the dose into weekly or twice-weekly injections usually evens things out.

Two branded injectables are worth knowing about. Xyosted is a weekly subcutaneous autoinjector with a boxed warning about blood pressure. Aveed is long-acting testosterone undecanoate given into muscle every 10 weeks after two loading doses. Because of a rare risk of a serious oil-embolism reaction and anaphylaxis, Aveed is only given in a certified clinic, with observation afterward.

Gels, solutions and the nasal gel

Testosterone gels such as AndroGel, Testim and their generics are rubbed onto the shoulders, upper arms or thighs once a day. Underarm solutions and a nasal gel (Natesto, used two or three times daily) are variations on the same idea.

What works well: daily dosing gives relatively steady levels that mimic the body's own pattern, and there are no needles.

What to watch: absorption varies between people, so some men never reach a normal level on gel. Skin irritation happens. The biggest issue is transfer. The FDA boxed warning on gels describes children who developed signs of virilization after contact with a parent's treated skin. If you live with young children or a partner who could be exposed, you need to wash hands, wait for the gel to dry, cover the site with clothing, and wash the area before close contact. Some households find that routine unworkable.

Patches

The testosterone patch (Androderm) is applied nightly. It gives steady levels, but skin reactions at the patch site are common enough that many men stop using it. It is used less often now.

Pellets

Testopel is the FDA-approved pellet for men. A clinician implants several small pellets under the skin of the hip or buttock through a tiny incision, and they release testosterone over roughly three to six months.

What works well: no daily or weekly dosing, and no transfer risk.

What to watch: once pellets are in, the dose is set until they wear off. If hematocrit climbs or side effects appear, there is no easy way to lower the dose quickly. The procedure carries small risks of infection, bruising and extrusion, where a pellet works its way out of the skin. Each insertion is an office visit. Pellets are also widely marketed in compounded forms, particularly to women; compounded pellets are not FDA-approved, and their dosing is less predictable.

Oral testosterone

Older oral testosterone (methyltestosterone) is rarely used in the US because of liver concerns. The newer products are different: Jatenzo, Tlando and Kyzatrex are oral testosterone undecanoate capsules, absorbed through the lymphatic system and taken with food, usually twice a day.

What works well: no needles, no gel, no transfer risk.

What to watch: all three carry a boxed warning that they can raise blood pressure, which can increase the risk of heart attack and stroke. Blood pressure should be checked before starting and regularly after. They are branded and often expensive without insurance, and they need consistent dosing with meals.

How the side effects compare

A few effects are common to every form because they come from testosterone itself, not the delivery method:

• Higher hematocrit. All forms can raise red blood cell levels. Injections tend to do so more than transdermal forms.
• Suppressed fertility. All forms of external testosterone suppress the hormones that drive sperm production. If you may want children, read TRT and fertility before choosing anything.
• Blood pressure. In 2025 the FDA required class-wide labeling changes: it added results from the TRAVERSE cardiovascular safety trial, removed earlier boxed-warning language about cardiovascular outcomes, and required blood pressure information on all testosterone products.
• Acne, fluid retention and breast tenderness can happen with any form.

Our article on TRT risks and monitoring covers how these are tracked.

How to choose

A practical way to think about it:

• If cost and flexibility matter most, injections usually win.
• If you dislike needles and there are no children or pregnant partners at home, a gel may suit you.
• If you want to avoid both needles and skin transfer, oral capsules are an option, with blood pressure checks.
• If you are already stable on testosterone and want fewer doses, pellets or long-acting injections can be discussed.

Switching between forms is common and reasonable. The first choice is a starting point, adjusted by how you feel and what your labs show. None of this matters until hypogonadism is confirmed, which means two low morning results and symptoms that fit. You can read how we evaluate and follow patients on our hormone therapy page.

Questions patients ask us

Which form of testosterone works best?

None is best for everyone. All FDA-approved forms can bring testosterone into the normal range in men with hypogonadism. Injections are cheap and flexible, gels give steady daily levels, pellets need fewer doses and oral capsules avoid needles and skin transfer. The right choice depends on your routine, your household, your budget and how your labs respond.

Are subcutaneous testosterone injections as good as intramuscular ones?

For many men, yes. Studies have shown that injecting cypionate or enanthate under the skin with a small needle can produce testosterone levels comparable to injections into muscle, and many men find it easier and less painful. A clinician should confirm your levels on whichever route you use, because individual absorption varies.

Why do some men feel up and down on injections?

Longer gaps between injections create a peak a day or two after the dose and a low point before the next one. Some men notice that as better and worse days. Splitting the same weekly amount into smaller, more frequent injections usually smooths the curve. Your trough level can be checked to see whether this is happening.

Can testosterone gel affect my partner or children?

Yes. The FDA boxed warning on testosterone gels describes children who developed signs of early puberty after skin contact with a treated parent. To reduce the risk, wash your hands after applying, let the gel dry, cover the area with clothing and wash the site before close contact. If that routine is hard to keep, another form may suit you better.

How long do testosterone pellets last?

The FDA-approved pellet for men, Testopel, typically lasts around three to six months, though this varies. The pellets are placed under the skin of the hip or buttock in a short office procedure. The tradeoff is that the dose cannot be lowered quickly once they are in, which matters if hematocrit rises or side effects appear.

Is oral testosterone safe for the liver?

The newer oral testosterone undecanoate capsules, Jatenzo, Tlando and Kyzatrex, are absorbed through the lymphatic system and are not associated with the liver problems seen with older methyltestosterone. Their main labeled concern is raised blood pressure, which carries a boxed warning. Blood pressure should be checked before starting and regularly afterward.

Which form raises hematocrit the most?

Injections, especially at longer intervals with higher peaks, tend to raise hematocrit more than gels or patches. All forms can raise it, though, which is why a blood count is checked at baseline and after starting. If hematocrit climbs too high, options include lowering the dose, changing the interval or switching forms.

Can I switch from one form of testosterone to another?

Yes, and it is common. Men switch because of cost, skin irritation, transfer concerns, uneven levels or convenience. Your clinician will plan the timing so you do not end up with a gap or overlap, and will recheck labs a few weeks to months after the change to confirm the new form is working.

What is Aveed and why is it given in a clinic?

Aveed is a long-acting testosterone undecanoate injection given into muscle, with doses about every 10 weeks after two starting doses. Because of a rare but serious risk of an oil microembolism reaction and anaphylaxis, it is only given in certified healthcare settings, and patients are observed for 30 minutes afterward.

Does the form of testosterone affect fertility differently?

No form of external testosterone protects fertility. All of them suppress the hormones that tell the testes to make sperm, and sperm counts can fall very low. If you may want children, discuss alternatives before starting, such as treatments that stimulate your own production instead of replacing testosterone.