ExcelMale Consensus: Where to inject testosterone depends on the method. Intramuscular shots go in the ventrogluteal hip, the upper outer buttock, the outer thigh or the deltoid. Subcutaneous shots go in belly fat at least two inches from the navel, or in the fat over the outer thigh or hip. In a 2017 study, all 22 patients who switched from intramuscular to subcutaneous preferred subcutaneous. Rotate sites with every injection.
Key Takeaways
- Subcutaneous testosterone reaches the same blood levels as intramuscular at similar doses.
- The ventrogluteal site sits away from the sciatic nerve, which makes it the safer gluteal choice.
- A 27 to 30 gauge, half-inch insulin syringe handles most subcutaneous and shallow intramuscular TRT doses.
- Rotating between at least four spots lowers the odds of lumps and scar tissue.
- No head-to-head study shows that one muscle gives better testosterone levels than another.
The testosterone cypionate label still tells you to inject deep into the gluteal muscle. Most men on the ExcelMale forum stopped doing that years ago. Smaller, more frequent doses with insulin syringes opened up sites the label never mentions, and the published data now back the change.
Where Are the Best Intramuscular Sites to Inject Testosterone?
The four standard intramuscular sites are the ventrogluteal hip, the dorsogluteal buttock, the vastus lateralis in the outer thigh, and the deltoid. Each has a different margin of safety and a different comfortable volume.
Why is the ventrogluteal site preferred over the buttock?
The ventrogluteal site has no large nerves or blood vessels under it. Find it by placing your palm on the bony point of the hip, pointing your index finger at the front hip bone and spreading your middle finger back. The injection goes in the V between the two fingers.Where exactly is the dorsogluteal site?
The dorsogluteal site is the upper outer quarter of the buttock. Stay high and to the outside. The sciatic nerve runs through the lower inner part, and a misplaced needle there can cause lasting nerve pain.Where do you inject in the thigh?
The thigh site is the outer middle third of the thigh, in the vastus lateralis. Divide the distance from hip to knee into three parts and use the middle one, toward the outside. It is easy to see and reach, which is why most men who self-inject start there.Can you inject testosterone in the deltoid?
Yes, for small volumes. The deltoid site is about two finger-widths below the bony tip of the shoulder. Keep it to 1 mL or less. Most TRT doses are 0.2 to 0.5 mL, so volume is rarely a problem.Where Do You Inject Testosterone Subcutaneously?
Subcutaneous testosterone goes into the fat layer of the abdomen, the outer thigh or the area over the hip. Pinch an inch of skin, insert a short needle at 45 to 90 degrees and inject slowly. On the abdomen, stay at least two inches from the navel.
The FDA approved a subcutaneous testosterone enanthate autoinjector in 2018, and its label specifies the abdomen. Compounded and generic cypionate are used the same way off-label. Bruising is more likely if you take aspirin or a blood thinner.
Is Subcutaneous Testosterone as Effective as Intramuscular?
Yes. Subcutaneous injections produce testosterone levels comparable to intramuscular injections at similar doses, according to a 2022 systematic review from Brigham and Women's Hospital (Figueiredo 2022).
Several studies give specific numbers. In Spratt's 2017 cohort, all 63 patients reached the normal male range on 50 to 150 mg per week under the skin, and 9 had minor, short-lived site reactions (Spratt 2017). Total testosterone averaged 627 ng/dL across the week between subcutaneous cypionate injections in a follow-up study (McFarland 2017). In the 52-week autoinjector trial, 92.7% of 150 men held average testosterone between 300 and 1,100 ng/dL, and more than 95% reported no injection pain (Kaminetsky 2019).
One comparison deserves attention if your hematocrit runs high. Among 234 men on 100 mg weekly, the subcutaneous enanthate group had lower hematocrit and estradiol after 12 weeks than the intramuscular cypionate group, at similar trough testosterone (Choi 2022). The two groups used different esters and devices, so the route alone may not explain it.
What Needle Size Should You Use for Each Injection Site?
Use a 27 to 30 gauge, half-inch needle for subcutaneous and shallow intramuscular injections, and a 22 to 25 gauge, 1 to 1.5 inch needle for deep intramuscular injections. Leaner men need less length.
| Site | Method | Typical needle | Comfortable volume | Notes |
|---|---|---|---|---|
| Ventrogluteal (hip) | Deep IM | 22 to 25 gauge, 1 to 1.5 inch | Up to 3 mL | Fewest nerves and vessels. Awkward to reach at first. |
| Dorsogluteal (buttock) | Deep IM | 22 to 25 gauge, 1.5 inch | Up to 3 mL | Upper outer quarter only. Sciatic nerve risk. |
| Vastus lateralis (outer thigh) | IM or shallow IM | 23 to 25 gauge, 1 inch, or 27 to 29 gauge, 0.5 inch | Up to 2 mL | Easy to self-inject. More soreness in some men. |
| Deltoid (shoulder) | IM or shallow IM | 25 gauge, 1 inch, or 27 to 29 gauge, 0.5 inch | 1 mL or less | Small muscle. Good for frequent small doses. |
| Abdomen | Subcutaneous | 27 to 30 gauge, 0.5 inch | 0.5 mL or less | Two inches from the navel. Labeled site for the autoinjector. |
| Outer thigh or hip fat | Subcutaneous | 27 to 30 gauge, 0.5 inch | 0.5 mL or less | Useful for lean men with little belly fat. |
Volumes are general nursing guidance for adults. Thick oils such as cypionate in cottonseed oil move slowly through a 29 or 30 gauge needle, so draw up with a larger needle or allow extra time.
How Often Should You Rotate Injection Sites?
Rotate with every injection and avoid reusing the same spot for at least a week or two. Repeated injections into one spot build scar tissue, and scarred tissue absorbs oil unpredictably.
A simple plan is left and right versions of two sites, which gives four spots. Men on daily or every-other-day protocols need more. One member in this thread injected daily for two years across shoulders, thighs, hips and buttocks to keep each spot rested. Your weekly volume per shot drops as frequency goes up, and the testosterone dose calculator converts your weekly milligrams into mL or insulin-syringe units for any schedule.
Which Injection Sites Should You Avoid?
Avoid the lower or inner buttock, the inner thigh, the calves and any area with scars, lumps, moles or broken skin. The lower inner buttock carries the sciatic nerve. The inner thigh carries large vessels.
Calves come up now and then as an extra rotation site. The same member who rotated daily tried them and reported lasting soreness. Most of the community skips them.
Why Does a Testosterone Injection Hurt or Leave a Lump?
Most post-injection pain comes from too much oil in a small space, injecting too fast, or a carrier oil your tissue doesn't tolerate. A small firm lump under the skin after a subcutaneous shot is usually the oil depot itself and fades within days.
Slowing down helps more than anything else. Take 10 to 20 seconds for the push and let the alcohol dry before the needle goes in. Warming the vial in your hand thins the oil. Spreading redness, heat, fever or a lump that grows after 48 hours needs medical attention.
Frequently Asked Questions
Can you inject testosterone in your stomach?
Yes, into the fat under the skin of the abdomen, at least two inches from the navel. This is a subcutaneous injection with a short needle. It does not go into the abdominal muscle.Is it better to inject testosterone in the thigh or the glute?
Neither has been shown to give better testosterone levels. The thigh is easier to reach on your own. The ventrogluteal site tends to hurt less and has fewer nerves nearby.Does the injection site change how testosterone is absorbed?
We don't have head-to-head data comparing muscles. Studies comparing subcutaneous with intramuscular show similar average levels, with smaller peaks and troughs under the skin.Can you inject testosterone into the same spot every time?
You shouldn't. Repeated use of one spot leads to scar tissue and lumps, and absorption becomes less predictable.What is the least painful place to inject testosterone?
For most men, abdominal fat with a 29 or 30 gauge needle. In the autoinjector trial, more than 95% of men reported no pain with abdominal subcutaneous injections.Related ExcelMale Forum Discussions
- Testosterone Dose Calculator. Converts mg per week into mL and syringe units.
- Hormone Calculators. The full set of ExcelMale tools.
- Testosterone Basics and Questions. Where members post injection technique questions.
Key References
- Figueiredo MG, Gagliano-Juca T, Basaria S. Testosterone Therapy With Subcutaneous Injections: A Safe, Practical, and Reasonable Option. J Clin Endocrinol Metab. 2022;107(3):614-626. doi:10.1210/clinem/dgab772
- Spratt DI, et al. Subcutaneous Injection of Testosterone Is an Effective and Preferred Alternative to Intramuscular Injection. J Clin Endocrinol Metab. 2017;102(7):2349-2355. doi:10.1210/jc.2017-00359
- McFarland J, et al. Serum Testosterone Concentrations Remain Stable Between Injections in Patients Receiving Subcutaneous Testosterone. J Endocr Soc. 2017;1(8):1095-1103. doi:10.1210/js.2017-00148
- Kaminetsky JC, et al. A 52-Week Study of Dose Adjusted Subcutaneous Testosterone Enanthate in Oil Self-Administered via Disposable Auto-Injector. J Urol. 2019;201(3):587-594. doi:10.1016/j.juro.2018.09.057
- Choi EJ, et al. Comparison of Outcomes for Hypogonadal Men Treated with Intramuscular Testosterone Cypionate versus Subcutaneous Testosterone Enanthate. J Urol. 2022;207(3):677-683. doi:10.1097/JU.0000000000002301
- Bhasin S, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103(5):1715-1744. doi:10.1210/jc.2018-00229
One Thing the Diagrams Leave Out
Body fat changes the map. A half-inch needle in the thigh of a lean man lands in muscle. The same needle in a heavier man lands in fat. Both work, but if your levels or side effects shift after a big change in weight, your "IM" shot may have turned into a subcutaneous one, or the reverse. Recheck labs before you change the dose. The dose calculator helps when you adjust frequency, and the Testosterone Basics forum is the place to post your protocol for feedback.
Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting or modifying any hormone therapy or medical treatment.
By Nelson Vergel | B.S. Chemical Engineering, MBA | Founder, ExcelMale.com | 34+ years on TRT | NIH and FDA advisory panel service | Author: Testosterone: A Man's Guide, Beyond Testosterone, The hCG Advantage, and From Pills to Implants. Updated November 2026.
About ExcelMale: ExcelMale.com is a men's health community founded by Nelson Vergel, with more than 24,000 members and over 20 years of archives covering testosterone replacement, hormone optimization, fertility, and men's sexual health.
Last edited:
