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Testosterone injection sites depend on the route your prescription uses. For an intramuscular shot, the location for testosterone injection is deep in a large muscle; for a subcutaneous shot, it’s the fat just under the skin. Here’s where each one goes, how to inject testosterone step by step, and which needle each site takes.
Quick answer
Most people inject testosterone like this:
- Check whether your prescription is intramuscular (IM) or subcutaneous (subQ).
- For IM, use the side of the hip, the outer thigh, the glute or the shoulder.
- For subQ, use the belly beside the navel, the thigh or the back of the arm.
- Put the needle in quickly, then push the plunger slowly.
- Switch sides every shot and write down where it went.
Step 5 is where Regimen comes in: a TRT tracker that suggests the next injection site for intramuscular or subcutaneous shots.
Step 1: Check Whether Your Shot Is IM or SubQ
The route comes from your prescription, so start there. The labels are clear about it:
- Testosterone cypionate (Depo-Testosterone) is “for intramuscular use only”, and the label says “Intramuscular injections should be given deep in the gluteal muscle.”
- Testosterone enanthate vials carry the same instruction: “slowly inject the preparation deeply into the gluteal muscle.”
- Xyosted (enanthate in an autoinjector) is the subcutaneous one: injected “subcutaneously in the abdominal region once a week.” Its label says to avoid intramuscular injection.
Some prescribers have cypionate or enanthate from a vial given under the skin. That’s outside the vial labels, so it’s your prescriber’s call, not something to switch to on your own.
Step 2: Pick a Muscle (IM)
Four muscles take an IM shot (coral on the diagram). Of these intramuscular testosterone injection sites, nursing texts prefer the side of the hip.
Glute (Buttock)
This is the site on the labels. If you’re wondering where to inject testosterone cypionate, the label’s answer is deep in the gluteal muscle. The labels say gluteal; nursing texts now prefer the side of the hip (ventrogluteal) over the buttock (dorsogluteal) because of the sciatic nerve.
Side of the Hip (Ventrogluteal)
The Open RN nursing textbook calls the ventrogluteal site “the safest injection site for adults.” It’s still a glute muscle, just on the side of the hip. To find it, put your palm on the bony knob at the top of the thigh (the greater trochanter), point your index finger at the front of the hip bone and spread your middle finger back along the top of the pelvis. The shot goes in the V between the two fingers. It holds up to 3 mL.
Outer Thigh (Vastus Lateralis)
The muscle on the outside of the thigh. It runs from a hand’s width below the bony knob at the top of the thigh to a hand’s width above the knee; use the outer middle third. It holds up to 3 mL, and it’s the easiest IM site to do yourself: a hospital testosterone sheet uses the front of the upper thigh so you can see and reach it.
Shoulder (Deltoid)
The middle of the shoulder muscle, about 1 to 2 inches below the bony point at the top of the shoulder. It’s small, so it takes about 1 mL at most. That rules it out for many weekly volumes.
Step 3: Pick a Fatty Spot (SubQ)
SubQ shots go into fatty areas (slate on the diagram). A hospital patient sheet lists three subcutaneous testosterone injection sites:
- Belly: the lower abdomen, at least 1 inch from the belly button. Xyosted’s own instructions say 2 inches.
- Thighs: the middle of the thigh, at least a hand’s width above the knee.
- Back of the upper arms: easier if someone else does it.
Pinch a fold of skin first so the needle stays in the fat and out of the muscle. In the testosterone cypionate dosage guide you’ll find how the subQ and IM routes compare.
In Regimen, about 60% of logged testosterone injections are intramuscular and about 40% are subcutaneous. For intramuscular shots, the shoulder (deltoid) is logged most often, followed by the thigh, the ventrogluteal site and the glute.
Step 4: How to Give a Testosterone Injection
For a shot into the muscle (from a hospital patient sheet):
- Wash your hands. If there are crystals in the vial, warm it in your hands and shake it; the cypionate label says that redissolves them.
- Wipe the vial top with an alcohol pad.
- Draw your dose with a blunt or larger drawing needle, then swap to the injection needle.
- Check for air bubbles, tap them to the top and push them out.
- Clean the site and let the alcohol dry.
- Hold the syringe like a dart and put the needle straight in at 90 degrees, quickly.
- Some instructions have you pull back on the plunger to check for blood first (the hospital sheet does). If you see blood, take the needle out, throw that dose away and start again at a new site.
- Push the plunger slowly and steadily until the syringe is empty.
- Take the needle out, press a gauze pad on the spot for 15 to 30 seconds, and put the sharps in a sharps container.
How to administer a testosterone injection under the skin: pinch a fold of skin, insert a ½-inch needle with a quick dart-like motion, push slowly, then let go of the skin.
Which Needle for Each Site
| Site | Route | Needle |
|---|---|---|
| Glute, side of hip, outer thigh | IM | 1 to 1½ inch (1 inch for most adults, 1½ if you’re larger) |
| Shoulder | IM | 1 inch for most adults |
| Belly, thigh, back of arm | SubQ | ½ inch |
Gauge varies more than length. A hospital testosterone sheet uses a 25 gauge needle, while nursing texts list 18 to 21 gauge for oily drugs. The needle size guide covers gauge, length and syringe size for testosterone in detail.
Do You Inject Testosterone Slowly or Fast?
Both. Put the needle in fast; it hurts less. Then push the oil in slowly. The enanthate label says to inject slowly, and nursing texts use about 10 seconds per mL, so a 1 mL shot takes about 10 seconds.
Other pain tips from the same sheet: inject the medicine at room temperature, let the alcohol dry first, keep the muscle relaxed, and don’t change the needle’s angle on the way in or out.
Step 5: Rotating Testosterone Injection Sites
Don’t inject in the same place every time. Hospital sheets suggest alternating sides (left thigh one time, right thigh the next), writing down the site and date of each shot, and picking a new area if the muscle is sore.
On a split schedule (twice a week or more), each shot is its own step in the rotation, so a four-spot rotation comes round twice as fast.
Where Not to Inject Testosterone
- Into a vein. The cypionate label says it should not be given intravenously, and the enanthate label says to avoid injecting into a blood vessel. That’s why some instructions have you check for blood first.
- Near the sciatic nerve. It runs through the buttock. Prefer the side of the hip over the buttock.
- More than 3 mL in one spot. A hospital sheet says to split a larger dose between two sites.
- Skin that’s bruised, sore, hard, red or scarred. Move to a new area.
Soreness After a Testosterone Injection
Some soreness is a known reaction: the Depo-Testosterone label lists “inflammation and pain at the site of intramuscular injection.” Rotating sites gives each spot time to settle.
Whether it’s a hard lump after testosterone injection or plain soreness, a hospital sheet says to call your provider if you:
- get a rash, redness or swelling at the injection site
- have soreness that lasts more than a couple of days or is painful to touch
- get a fever of 101°F or higher after the injection
More on soreness and other reactions in the testosterone injection side effects guide.
Track Your Injection Sites With Regimen
Keeping that site log by hand gets old fast. Regimen is a TRT tracker that keeps it for you:
- Injection site rotation: a body map that suggests the next site, custom spots of your own, and a sore spot rested until you say otherwise, for intramuscular or subcutaneous shots.
- Injection logging with custom scheduling: weekly, twice weekly, every few days or daily, with reminders.
- An mg-to-mL calculator for your vial’s concentration, and ester-specific level curves that show where your levels sit between shots.
- Bloodwork on the same timeline as your shots, scanned or typed in, plus side effects and HCG or anastrozole alongside your testosterone.
Free for one compound, no time limit; Premium if you track more than one. It’s on iPhone, Android and the web: App Store and Google Play.
Before You Change Anything
Your route, site and needle are part of your prescription. This page explains what the labels and standard nursing instructions say; it doesn’t replace the instructions from your prescriber or pharmacist. It is not medical advice.
Frequently Asked Questions
What’s the best injection site for testosterone?
For a shot into the muscle, the labels say gluteal; nursing texts prefer the side of the hip (ventrogluteal) over the buttock. The outer thigh is the easiest to reach yourself. For a subcutaneous shot, the belly beside the navel is the usual spot.
Where do you inject testosterone cypionate?
The Depo-Testosterone label says intramuscular, deep in the gluteal muscle. Nursing texts also use the side of the hip and the outer thigh; a hospital self-injection sheet uses the front of the upper thigh. Some prescribers have it given under the skin, outside the label.
Can you inject testosterone in your thigh?
Yes. The outer thigh muscle (vastus lateralis) is a standard intramuscular site, and a hospital self-injection sheet uses the front of the upper thigh because you can see and reach it. For subcutaneous shots, the thigh is one of the three usual spots.
Can you inject testosterone in your stomach?
Only under the skin, and only if your prescription is subcutaneous. Xyosted, the one US testosterone injection labelled for subQ use, goes in the abdomen.
How much testosterone can you inject in one spot?
A hospital patient sheet says no more than 3 mL at one site; split anything larger between two sites. Nursing texts put the deltoid at about 1 mL.
Sources
- Depo-Testosterone (testosterone cypionate) label, Pfizer, revised June 2025: DailyMed.
- Testosterone enanthate injection label, Hikma, current version May 11, 2026: DailyMed.
- Xyosted (testosterone enanthate) label and instructions for use: DailyMed.
- Ernstmeyer and Christman (eds.), Nursing Skills (Open RN), 18.6 Administering Intramuscular Medications: LibreTexts.
- Ohio State Wexner Medical Center, Giving Testosterone as an Injection into Muscle (July 2020): PDF.
- Allina Health, How to Give Subcutaneous (Under the Skin) Testosterone Injections (June 2023).
- MyHealth Alberta, How to Give an Intramuscular Shot (current as of October 25, 2024): myhealth.alberta.ca.
All sources checked October 20, 2026.
