Which forms of testosterone are available?
Once deficiency is confirmed and treatment chosen, the next step is the form of medicine. The most common are intramuscular injections and topical gel, each with its own advantages and limitations.[1]
A frequent question is “which one is stronger?” In practice, suitability, convenience, cost and monitoring matter far more. The goal of treatment is a level within the normal range and better symptoms, not the highest possible number.[1],[2]
Why the choice of form matters
A form that fits daily life is one you can actually stick with. Men who travel often may find daily gel inconvenient, while men who dislike needles or cannot visit a clinic regularly may prefer gel.[1]
Safety differs too. Gel carries a risk of transferring testosterone to a partner or children through skin contact, while some injections cause larger peaks and troughs and more often raise haematocrit. No formulation is best for everyone.[1],[2]
Not everyone with a low result needs testosterone
Before discussing forms, it is worth repeating that the prevalence of low results is not the number of men who should receive TRT. Treatment is considered only for men with a confirmed diagnosis and clear symptoms.[1] The products available also differ between countries.
Hormone levels with each form
Each form produces a different pattern of blood levels.[1],[2]
- Short-acting injections, such as testosterone enanthate, are given every one to three weeks as prescribed. Levels are high for a few days after an injection, then fall before the next one. Some men notice energy or mood changing with the cycle.
- Long-acting injections, such as testosterone undecanoate, give steadier levels, with injections roughly every 10–14 weeks after the loading phase. They must be given by a health professional.
- Gel is absorbed through the skin daily and gives fairly steady levels through the day, although absorption varies between individuals.
What your doctor considers when choosing
The indication is always confirmed first. Your doctor then considers your medical conditions, haematocrit, the risk of gel transfer to people at home, how easily you can attend follow-up, and your personal preference.[1],[2]
For men whose haematocrit is already fairly high, a form with smaller peaks may be preferred. Men in close contact with young children or a pregnant partner need extra care with gel.
Using each form safely
Gel: apply to the skin areas stated on the label, wash your hands every time, let it dry and cover it with clothing, and avoid skin-to-skin contact of the application site with partners or children. Wash the area before close contact.[1],[2]
Injections should be given by a health professional, or after proper training, using licensed products, without changing the interval or dose yourself.[1]
Time blood tests correctly. The right time to test depends on the form: usually midway between doses for short-acting injections, just before the next dose for long-acting injections, and, with gel, never from the application area, which gives a falsely high result.[2] The choice balances preference, health and cost.
How we care for you at Dr. Kris Clinic
We explain the advantages and limits of each form clearly and ask about your daily life, including travel, family and how easily you can come to the clinic, before choosing together, in English or Thai. After you start, we time blood tests to suit the form, check blood pressure and monitor haematocrit.
If you already use testosterone and want to change form, we plan the switch safely, because doses do not convert directly between formulations.
Frequently asked questions
Are injections stronger than gel?
No. Both can bring levels into the normal range. They differ in how levels rise and fall, convenience and side effects.
Can I hug my children after applying gel?
Yes, once the gel has dried and the area is covered by clothing, and you have washed your hands, to prevent transfer.
I feel tired before my next injection. What should I do?
Do not bring the injection forward yourself. Tell your doctor so levels can be tested at the right time and treatment adjusted if needed.
Can I switch from injections to gel?
Yes, under medical supervision, with a planned changeover and fresh monitoring.
Testosterone injections and gel each have trade-offs. Choose the form that fits daily life and monitor according to the formulation.[1] Doses are not directly interchangeable, so never switch or adjust them yourself.
Talk to a doctor about this
Confidential care in Surat Thani, the mainland gateway to Koh Samui, Koh Phangan and Koh Tao. Tue–Fri 17:00–20:00 · Sat–Sun 10:00–15:00 (UTC+7)
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Dr. Krida Uakridathikarn (Dr. Kris)
Board-certified family physician with certificate training in clinical sexology and sexual medicine. He works at Suratthani Hospital and provides sexual health, hormone and LGBTQ+ inclusive care at Dr. Kris Clinic. Profile and CV
References
- EAU Guidelines 2026: Male Hypogonadism
- Endocrine Society: Testosterone Therapy for Hypogonadism (2018)
- FDA: Testosterone Information; June 2026 labelling update
Keep reading
Main guide: Men's sexual health
Low Testosterone: Symptoms and How It Is Properly Diagnosed
Tests Before Starting Testosterone Therapy (TRT)
Testosterone Enanthate vs Undecanoate: How the Two Injections DifferThis article is general education, not personal medical advice or a promise of results. Diagnosis and treatment require assessment by a doctor. Content reflects the cited sources as of the update date.