I use 30 gauge 1/2” in my thigh 1/2cc weekly for my trt.
I just started that last year, I wish I had known the past 19 years I have been on trt that I could go that small!
I was started on a 21 gauge 19 years ago, which is what my first trt doctor prescribed, switched to 23 gauge that year, stayed there until probably 5-6 years ago when I realized a 25 gauge would work, then finally saw a YouTube video 6-8 months ago about using the 30 gauge for trt.
Hard to push but it’s only a half cc and I can’t even feel the 30 gauge in my thigh.