This guide covers supplies and general technique points for testosterone that has been prescribed for subcutaneous (the layer of fat just below the skin) self-administration at home. It does not decide whether SubQ testosterone is appropriate for you. Intramuscular (into the muscle beneath the fat) testosterone protocols use different needles and typically benefit from in-person training with a clinician or nurse. If your prescriber has you on an IM protocol, speak to your pharmacy about appropriate supplies and technique; we don't currently stock needles typically used for IM testosterone protocols, and IM needle gauge and length should be confirmed with your prescriber or pharmacist. For supply-only browsing, see our TRT injection supplies collection.

SubQ TRT injection supplies including insulin syringe, alcohol wipes, and vial
SubQ testosterone injection supplies: insulin syringe, alcohol wipes, and sharps container.

Supplies You Need for SubQ Testosterone

  • Insulin syringe (31G 6mm): some prescribers specify a small fixed-needle syringe for SubQ testosterone, while others specify a different syringe or a separate draw method because testosterone is often oil-based. Choose the size from your prescribed volume: use the millilitre volume on your prescription or pharmacy instructions. If using a U-100 insulin syringe, confirm the exact draw mark with your pharmacist. On U-100 syringes, 1 unit = 0.01ml; do not equate syringe units with testosterone milligrams. A 0.5ml insulin syringe can be easier to read for smaller volumes, while a 1ml insulin syringe holds larger volumes. Confirm the syringe, gauge, needle length, and draw method with your prescriber or pharmacist.
  • Alcohol wipes: one for the vial stopper, one for your injection site. For the hygiene workflow, see our alcohol wipes injection guide.
  • Sharps container: a locking 1.8L Sharpsafe is commonly suitable for many home TRT setups; choose a size based on injection frequency and local disposal options. Dispose of your used syringe immediately after each injection.

Step-by-Step: SubQ Testosterone Injection

  1. Wash your hands thoroughly with soap and water.
  2. Wipe the rubber stopper on your testosterone vial with an alcohol wipe. Let the alcohol dry completely before puncturing the stopper, following the wipe instructions.
  3. Pull the syringe plunger back to draw air equal to your prescribed dose volume if your pharmacist has instructed this vial technique.
  4. Insert the needle through the rubber stopper and gently push the air into the vial if instructed. This can equalise pressure and help the oil draw.
  5. Invert the vial. Keep the needle tip in the oil and slowly pull back the plunger to draw your prescribed dose. Fine needles draw oil slowly; don't force it. If drawing is impractical with the specified syringe, ask your pharmacist whether a different draw method is needed.
  6. Adjust bubbles and final volume exactly as your pharmacist taught you, ideally while the needle remains in the vial. Avoid touching or contaminating the needle, and do not overcorrect tiny bubbles if doing so would compromise dose accuracy or sterility.
  7. Wipe your chosen injection site with a fresh alcohol wipe. Let it air-dry.
  8. Pinch up a fold of skin between your thumb and fingers; this is especially important if you have low body fat, to keep the needle in subcutaneous tissue.
  9. Use the angle your prescriber taught you; with a short 6mm needle this is often 90 degrees into a pinched fold, but technique may vary by site and body habitus.
  10. Slowly push the plunger to inject. Hold the needle in place for 5 to 10 seconds after injecting before withdrawing.
  11. Apply light pressure with clean dry gauze or cotton if any fluid appears at the site.
  12. Dispose of the syringe in your sharps container immediately.

Why pinch-up matters

A 6mm insulin needle is commonly used in some prescribed SubQ protocols, but it is not the right length for every adult, site, or dose volume. For lean individuals (low body fat on the abdomen or thigh), pinching up a skin fold may help keep the needle in subcutaneous tissue. Confirm needle length, site, and angle with your prescriber, especially if you are very lean or have concerns about reaching the correct tissue layer.

A note on needle re-use

Use a fresh sterile syringe and needle for every injection. Don't re-use the same syringe across multiple injections, and never re-enter a vial with a used needle or syringe; it can contaminate the vial and future doses. Only use a vial for future doses if it is labelled or supplied as multi-dose. Discard single-use vials or ampoules after opening or puncture, and follow the label or pharmacist's beyond-use and storage instructions for multi-dose vials. Used or repeatedly punctured needles can also increase discomfort and stopper damage. Use once, then dispose of it immediately in a sharps container.

Self-injection technique: one hand pinches a fold of abdomen skin while the other positions an insulin syringe as instructed
Self-injection technique: one hand pinches a fold of abdomen skin while the other positions an insulin syringe as instructed.

SubQ Testosterone Injection Sites

  • Abdomen: choose sites at least 2 inches (5cm) away from the navel. Rotate between left and right sides and vary the exact spot with every injection.
  • Upper outer thigh: another option with enough subcutaneous fat in most people.
  • Love handles / flanks: good option for some, especially if abdomen and thigh need rotation breaks.
  • Upper outer buttock (gluteal): some clinicians may approve upper-outer gluteal or flank SubQ sites for selected patients. Use this site only if your prescriber has confirmed the site, angle, and needle length for you.

Rotate sites each injection. Avoid injecting into the same exact spot twice in a row; consistent site rotation reduces the risk of lipohypertrophy, irritation, and scar tissue, which can affect absorption.

Injection Site Rotation for SubQ TRT

TRT is a long-term treatment, often lasting years or indefinitely. Repeated injection into the same exact spot increases the risk of scar tissue, lipohypertrophy, lipodystrophy (changes in fat tissue), irritation, or lumpy tissue, which can affect absorption over time.

Rotate between multiple areas on the abdomen and thighs if those sites are approved for you. Move at least 2-3cm from your last exact puncture point within each area. A simple system is to rotate left abdomen, right abdomen, left thigh, then right thigh, while also varying the exact spot within each area. The rest interval depends on your injection frequency; with frequent injections, the same broad area may come around sooner, so keep each exact puncture point away from recent sites.

For a detailed rotation guide, see our Injection Site Rotation guide.

Common Issues and Troubleshooting

Oil is slow to draw

If your instructions say to draw directly with a fine fixed-needle syringe, expect oil to draw slowly. Holding the vial in your hands for a few minutes before drawing may help if the label permits room-temperature handling. Do not heat the vial with hot water or a microwave. If drawing is impractical or you see particles, cloudiness, leakage, or crystallisation, ask your pharmacist before using it.

Small lump at injection site after SubQ

A small, non-painful lump can occur after SubQ testosterone injection and may settle over several days. It can be related to the injected oil depot or local tissue irritation, but do not assume every lump is harmless. Seek medical advice if it is painful, hot, red, growing, associated with fever or pus, or persists.

Bleeding after injection

A few drops of blood can occur after withdrawing the needle, usually because the needle has nicked a small blood vessel. Apply gentle pressure for 30-60 seconds. It does not mean the injection failed or that you need to re-inject. If you experience significant bleeding or a growing haematoma, contact your doctor.

Post-injection pain

Mild soreness at the SubQ injection site for a day or two is occasionally reported, especially early in treatment. Injecting slowly, using a fresh single-use needle, and bringing the vial to room temperature if permitted by the label or pharmacist may help reduce discomfort. If pain is severe, worsening, or accompanied by redness, swelling, or warmth, seek medical advice to rule out infection. Urgent red flags: fever, spreading redness, fluctuant swelling (suggesting abscess), severe pain, or pus; seek medical care promptly.

TRT requires ongoing monitoring. Your doctor should set a monitoring plan, which may include testosterone levels, haematocrit, and prostate or PSA monitoring where clinically indicated. This article is about injection technique only; it does not replace your monitoring plan.

When to call your prescriber

A small drop of blood or a brief sting can happen with injections, but follow your medicine instructions and contact your prescriber if symptoms concern you or match the warning signs below:

  • Redness, warmth, swelling, pus, worsening pain, red streaking, or increasing tenderness at any time after injection, especially if spreading or accompanied by fever
  • A hard lump that doesn't go away after a week, or one that's hot and tender
  • Fever, chills or feeling unwell after an injection
  • Any rash, hives or itching at or beyond the injection site (possible allergic reaction)
  • Signs of a severe allergic reaction - swelling of face or throat, difficulty breathing - call 000 immediately
  • You realise you injected from a vial that was stored outside the label conditions, exposed to excessive heat or light, was unexpectedly cloudy, crystallised, discoloured, leaking, expired, or contained particles, unless the product label specifically says cloudiness or suspension is expected

Frequently Asked Questions

What supplies do I need for SubQ TRT injections in Australia?

At minimum, most home injection setups need an appropriate syringe, alcohol wipes if instructed for skin or vial prep, and a sharps container. For prescribed SubQ testosterone, your prescriber or pharmacist may specify insulin syringes (31G 6mm), a different syringe, or a separate draw method. Injection supplies are available over the counter in Australia without a prescription, but the testosterone itself and the injection route require medical direction. For IM testosterone injections, speak to your pharmacy; we do not currently stock needles typically used for IM testosterone protocols.

Can I do TRT injections subcutaneously?

Some prescribers use SubQ testosterone for selected patients. Whether it is appropriate depends on your prescribed product, clinical plan, dose, monitoring, and response. Follow your prescriber's route, dose, and monitoring instructions, and do not switch from IM to SubQ without medical direction.

How often do I need to inject?

This depends entirely on your prescription. Your doctor will determine the dose and frequency based on your blood work. Do not change your schedule without medical guidance.

Do I need a prescription for injection supplies in Australia?

No. Syringes, needles, and alcohol wipes are available without a prescription in Australia. You can buy them from us online, delivered to your door. The testosterone itself requires a prescription, but the injection supplies do not.

How do I dispose of used TRT needles?

Used needles must go in a sharps container, never in regular household waste. In Australia, you can buy sharps containers from us (some council programs also provide them free), and return full containers to participating pharmacies, council/community sharps drop-off points, or other approved local disposal services. Check your local council or pharmacy first. See our Syringe Disposal Guide for full details.

Browse our TRT injection supplies collection and full injection supplies collection:

For IM testosterone injections, speak to your pharmacy; we do not currently stock needles typically used for IM testosterone protocols.