Last updated: · Maintained by Sam Calder
Where should you inject testosterone? IM & SubQ sites, rotation & schedules
You should inject testosterone into the glute (ventrogluteal or dorsogluteal), the outer thigh (vastus lateralis), the deltoid for small volumes, or the abdomen and love handles for subcutaneous shots — the best site depends on your prescribed route, dose volume, and how easily you can reach and rotate. This guide maps every common IM and SubQ site, shows a rotation chart, and gives a rotation schedule matched to your injection frequency.
Key takeaways
- IM sites: ventrogluteal/dorsogluteal glute, outer thigh (vastus lateralis), deltoid. SubQ sites: abdomen, outer thigh, love handles, upper arm.
- Keep each new injection at least 2–3 cm from the last mark, and rotate between regions so no spot is reused until it has rested for weeks.
- Match your number of rotation sites to your injection frequency — once-weekly needs 2 sites, EOD/daily needs 6–7.
- Work your per-shot volume out first in the TRT dose calculator before splitting a weekly dose across sites.
Where can you inject testosterone?
Testosterone is injected either intramuscularly (into muscle) or subcutaneously (into the fat layer beneath the skin), and each route uses different sites. IM is the traditional route with decades of data and handles larger volumes; SubQ uses a smaller needle, is less painful, and suits smaller, more frequent doses. Your prescribed product matters — some testosterone products are labeled specifically for IM gluteal use, while others are approved for weekly SubQ. Always follow your product label and prescriber.
| Site | Route | Typical needle length | Typical comfort volume |
|---|---|---|---|
| Ventrogluteal (upper-outer hip) | IM | 1–1.5 in (25–38 mm) | Up to about 2 mL |
| Outer thigh (vastus lateralis) | IM; sometimes SubQ | IM: 1–1.5 in (25–38 mm); SubQ: short insulin length | IM: up to about 2 mL |
| Deltoid (shoulder) | IM | About 1 in (25 mm) | Up to about 1 mL |
| Abdomen / love handles | SubQ | 0.5 in (8–13 mm) or insulin length | About 0.5–1 mL |
These volumes are rough comfort guides, not universal limits. Comfort varies by person, formulation, needle, and technique; follow your product instructions and prescriber's directions. Needle length depends on the route and the tissue between skin and muscle. Gauge is different from length: a larger gauge number means a thinner needle. Some people use one needle to draw oil from the vial and a fresh needle to inject; see needle sizes explained for the distinctions.
Practical volume rule: if you inject more than ~0.5 mL per shot, IM is usually more comfortable; at ~0.3 mL or less, SubQ with an insulin syringe is typically the better experience.
See also: IM vs SubQ injections and needle sizes explained.
IM vs SubQ decides the site first
Choose the prescribed route before choosing a body site. An IM injection places the medication in muscle and needs a needle long enough to reach it. A SubQ injection places it in the fatty layer under the skin and uses a shorter needle. The route determines which sites and needle lengths make sense, while the draw volume helps narrow down the comfortable options.
Testosterone cypionate product labeling specifies deep intramuscular gluteal administration; some products and protocols also allow subcutaneous use when directed by a prescriber. Research has found SubQ testosterone can produce comparable levels for some regimens, but that does not change the instructions for a particular product or person. Follow the route on your prescription and product label rather than switching based on a general comparison. For a fuller route comparison, see IM vs SubQ injections.
The ventrogluteal hip and outer thigh are practical larger IM sites. The deltoid is a smaller muscle and is usually better for a lower-volume injection. For SubQ, people commonly use the lower abdomen, outer thigh, or flank where a pinch of fatty tissue is available. Avoid injecting through irritated or damaged skin, and rotate to a fresh point each time.
How to calculate the draw before choosing a site
Work out the volume for each injection from the prescribed dose and the concentration printed on the vial: volume (mL) = dose (mg) ÷ concentration (mg/mL). For a U-100 insulin syringe, each 1 mL equals 100 units, so multiply the volume by 100. If a weekly dose is divided across injections, calculate each shot using its own per-injection dose. Confirm the numbers in the TRT dose calculator before drawing.
Split twice weekly: A 120 mg weekly prescription split into two shots is 60 mg per shot. At 200 mg/mL, 60 ÷ 200 = 0.30 mL = 30 units. That is a small volume; the prescribed route determines the suitable site.
Once weekly: At 200 mg per injection from a 200 mg/mL vial, 200 ÷ 200 = 1.0 mL = 100 units. A larger IM site may be more comfortable than the deltoid at this volume.
Smaller, frequent shots: A 140 mg weekly dose split into two gives 70 mg per shot. At 200 mg/mL, 70 ÷ 200 = 0.35 mL = 35 units. Use the route and site specified for the prescription.
Concentration changes volume: For 100 mg from a 250 mg/mL vial, 100 ÷ 250 = 0.40 mL = 40 units. The same dose from a 200 mg/mL vial is 100 ÷ 200 = 0.50 mL = 50 units.
Very small dose: For 30 mg from a 200 mg/mL vial, 30 ÷ 200 = 0.15 mL = 15 units. Read the syringe at eye level and use its scale; do not estimate from a different vial concentration.
After calculating the draw, compare it with the table's rough comfort volumes. If it is larger than the site comfortably holds, ask your prescriber whether the dose can be split across sites or whether another site is appropriate. Do not change the prescribed amount or route to make the arithmetic fit.
Ventrogluteal vs dorsogluteal — which glute spot?
The ventrogluteal site (the upper-outer hip) is the preferred glute injection site in modern protocols because it carries less risk of hitting the sciatic nerve and has less subcutaneous fat to navigate than the traditional dorsogluteal spot. "Glute injection" is not one location — there are two, and the ventrogluteal is generally the better, safer choice for self-injection once you can locate it reliably. If you're new and can't confidently find the ventrogluteal landmark, the outer thigh is an easier starting site.
How far apart should testosterone injection sites be?
Keep each new injection at least 2–3 cm — about one finger-width — from the previous mark, and rotate between separate regions so each area rests for weeks before reuse. Within a single region you step across it in a grid; across the week you move between regions entirely. For abdominal SubQ shots, stay at least 5 cm (about 2 inches) away from the navel — the tissue around the belly button is denser and more sensitive, which means more pain, more bruising, and less consistent absorption.
Testosterone injection site rotation chart
A rotation chart turns "don't hit the same spot" into a system you can actually follow. Picture each region as a grid of spots spaced ~3 cm apart: a thigh roughly 12 cm × 12 cm holds a 4×4 grid — 16 distinct spots before you ever return to the first. Cycle through them in numbered order and the earliest spot gets two-plus weeks to heal.
Testosterone rotation schedule by frequency
Your rotation schedule should match how often you inject — the more frequent the shots, the more sites you need in the cycle so each one gets enough rest. The principle is simple: number your sites and move through them in order.
| Frequency | Sites needed | Example rotation |
|---|---|---|
| Once weekly | 2 | Alternate left and right glute each week |
| Twice weekly | 4 | Left glute → right delt → right glute → left delt |
| Every 3.5 days (E3.5D) | 4 | Same 4-site cycle; each site rests ~2 weeks |
| EOD / daily (SubQ) | 6–7 | L/R abdomen, L/R love handles, L/R thigh — numbered 1–7 |
Because left and right count as separate sites, three regions already give you six rotation points — enough even for EOD. See daily vs twice-weekly vs every 3.5 days.
A rotation map you can copy
The easiest rotation map is a fixed sequence you repeat on autopilot: right abdomen → left abdomen → right outer thigh → left outer thigh → repeat. For SubQ abdomen only, draw an imaginary square around your navel (staying 5 cm clear) and rotate through its four corners. Write whichever pattern you choose on a sticky note by your supplies, or mark it in the injection calendar, until it's automatic. The specific pattern doesn't matter — consistency does.
Signs you're not rotating enough
The warning signs of overusing a site are increasing post-injection pain (PIP), firm lumps, and testosterone levels that feel "off" despite an unchanged dose. Scar tissue and lipohypertrophy (rubbery lumps of overgrown fat) absorb testosterone unevenly because they have poorer blood flow, so your effective dose drifts even when your syringe math is perfect. A new site being sore for 24–72 hours is normal; a spot that gets more painful over time, or develops a lasting lump, is the signal to rotate wider.
So, where should you inject testosterone?
For intramuscular injections, the ventrogluteal glute and the outer thigh are the two most practical self-injection sites — the ventrogluteal carries less sciatic-nerve risk than the traditional dorsogluteal, while the thigh is the easiest to see and reach. For subcutaneous shots, the abdomen (staying 5 cm clear of the navel) and love handles give you the most rotation points. Match the number of sites to your frequency: 2 for once-weekly, 4 for twice-weekly or E3.5D, 6–7 for EOD or daily. Work out your exact per-shot volume first with the TRT dose calculator, then build your rotation around it.
Frequently asked questions
Where should you inject testosterone?
How often should I change testosterone injection sites?
How many injection sites do I need?
Is ventrogluteal better than the regular glute spot?
How far from the belly button should I inject?
My injection lump won't go away — what does it mean?
Sources
- Blanco M, Hernandez MT, Strauss KW, Amaya M. Prevalence and risk factors of lipohypertrophy in insulin-injecting patients with diabetes. Diabetes & Metabolism. 2013. PubMed.
- Hirsch LJ, Strauss KW. Improvement of Insulin Injection Technique: Examination of Current Issues and Recommendations. The Diabetes Educator. 2016. PubMed.
- CDC. Safe Injection Practices to Prevent Transmission of Infections to Patients. 2024. CDC clinical guidance.
- Pfizer/Pharmacia & Upjohn. Depo-Testosterone (testosterone cypionate) label — intramuscular gluteal administration. DailyMed. DailyMed.
This guide is for general educational purposes only and does not constitute medical advice. InjectBuddy is a maths and reference tool, not a medical service. Always follow your prescriber's specific instructions on where, how, and how often to inject.