I’m 50, have over 10yrs of 2-3 shots per week (continuous) 23 gx 1” or even 22g x 1.5” in delts, glutes and quads with no scar tissue. I think some folks underestimate how tough our bodies are. If you don’t rotate sites and favored 1 way too much it might get “gristle-y” when you insert the needle there.
We train with weights, micro tears happen all day long in muscle and it doesn’t mean they develop scars. Why would that same tissue have trouble accommodating a 1-3ml liquid bonus that absorbs in a week? Unless you are extremely prone to scarring (keloids etc.)
Does scar tissue come more from certain actives we inject, certain carriers we inject, the size of the bolus of anything we inject, or just the mere fact of sticking pointy steel things in, over and over, even if nothing was injected?
I've just begun switching to smaller pins. "Just begun" in that I'm still in the online shopping phase. My dumb ass didn't know 1cc luer lock syringe-only's had become available. Now I know, but finding the luer lock needle-only in the gauge/length I want is a little trickier.
Back before I switched to slin pins, I used to struggle with smaller needles and 3ml syringes. I think I had 27g.
Anyway, trying to push so hard on the plunger and shaking my hand around, I felt I was doing more damage than I was saving. (Like a sewing machine vibrating the needle in and out!)
I figured out I could cut the end off the cap that comes protecting the needle. You can cut it off at your desired length to have the needle go any depth you want. Then you can really push it against your skin thereby steadying your hand. You can just bury pushing it all the way in resting on the open end you cut off.