Tweetdepends on how big your shoulders are. personally, i've never gone past 1.5cc in my delts and that felt like enough. not sure if i could dump 2cc in there. i mean i guess i could, but it would probably be uncomfortable. honestly, if you're big enough to be injecting 2cc in there and you are totally comfortable with it, then a little more would be fine. depending on your size (i'd say over 230) 3cc could fit.