Testosterone replacement therapy (TRT) involves injecting testosterone into the body to raise low testosterone levels. Choosing the right needle size for TRT injections is important for comfort, effectiveness, and safety. The most common injection sites are the glutes (buttocks), thighs, and shoulders.
Needle gauge - This refers to the thickness of the needle. Higher gauges mean thinner needles. Common gauges are:
- 22-25 gauge: Thinner needles for shallow intramuscular (IM) injections into smaller muscles and subcutaneous (SubQ) injections under the skin. Less painful but can bend more easily.
- 20-21 gauge: Thicker needles that are sturdier for deep IM injections into larger muscles. More painful but less likely to bend.
Needle length depends on your injection site and whether the injection is subQ or IM:
- 5/8 inch (16mm): Good for SubQ injections. Not long enough to reach deep into most muscles.
- 1 inch (25mm): Versatile length for IM injections into most sites and people. Common choice.
- 1 1/2 inches (38mm): Allows deep IM injections in people with more body fat. Useful for glute injections.
- 2 inches (51mm): Very long, only needed for IM glute injections in heavier patients.
Recommendations by injection site:
Glutes:
- SubQ: Use 5/8 inch, 23-25 gauge
- IM: 1-1 1/2 inches, 20-23 gauge
Thighs:
- SubQ: Use 5/8 inch, 23-25 gauge
- IM: 1 inch, 22-25 gauge
Shoulders:
- SubQ: Use 5/8 inch, 23-25 gauge
- IM: 1 inch, 22-25 gauge
Other factors:
- Injecting more viscous fluids may require thicker needles
- People with less body fat can use shorter needles
- Rotating sites helps reduce scar tissue and lumps
If you are considering TRT, the physicians at
Hormone Wellness Center have over 10 years of experience optimizing
testosterone therapy for men. We individualize your treatment plan based on your hormone levels, symptoms, lifestyle, and goals.
Our state-of-the-art clinic offers:
- Comprehensive lab testing to diagnose low testosterone
- Cutting-edge testosterone treatments with short-acting, long-acting, and oral options
- Help determining the ideal needle size for your injections
- Ongoing monitoring and dosage adjustments
- Lifestyle, nutrition, and exercise guidance
- Addressing side effects
We accept most major insurance plans.
Contact us today to schedule your consultation.