i personally can't tell the difference in pain between a 23 and a 25. I always buy the syringe with a 23 to draw then change to another pin for inj. only time I use 25 is when injecting tren. just so I don't shoot it too fast and get fina cough. but overall I'd just stick with 23's
I use 22g 1 1/2 inch myself my friend went up to the pharmacy i told him what to get but they were out of the 22g and i forgot to tell him he could also use 23 so he got the 25g!