I use 21gx1.5 to draw, 23gx1.5 for glute and quad, 23gx1 and sometimes a 25gx1 for all other areas. Have used 29gx.5 insulin for HCG but will go with 31gx5/16 when the 29's are gone.

I also warm up the loaded syringe to thin the juice before injecting.