Shit I use 23 gauge all the time, still painless...but have to agree with site rotation, after thinking about it more...3 cc x 14 injections in each delt = 42 cc of oils in one delt over an 8 week period, would be better to spread that around just a little bit, but my bro knows his body better than anyone else...for christ sakes look at him lol!!! I support him no matter what.
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I wish I could get some smaller than 22g lol after using slin pins for a while between cycles that 22 gauge pin looks like a spear!