I've done a half dozen or so cycles in the past and I have always used 25 guage pins, 1" long for glute shots. This cycle that I started about 4 weeks ago, I decided to go to a 23 guage, 1 1/2 and what a difference. When I am jabbing, I can't tell the difference between the 25 and the 23 going in, but man, it is so much easier to inject. I actually feel less soreness the next day using the 23 guage. In fact I hardly feel sore at all. What a difference.