===================== BUY ANABOLICS ONLINE: https://t.co/0pdMsW5ou0 ===================== The typical needle gauge used to inject testosterone is between 22 and 25. It would stand to reason that using a smaller gauge needle would reduce injection pain, but researchers have disagreed on this on this point. Furthermore, can you inject testosterone in your balls? Needle for IM injections can be 22-23 Gauge, 1-1.5 inches in length, adjusted for thickness of site. Step 1: Setting Up for the Injection ... How to Give Yourself a Testosterone IM Injection - 3 - Step 3: Preparing the Injection Dose 1. Take the cap off the vial. Clean the rubber stopper with one alcohol swab.