25 5/8 are fine for lean people, you will know if you dont go deep enough into the muscle because you will get red swollen, heating feeling coming off the inj site, thats from the inj not being deep enough, also can be from to much ba in the juice, but 23 ga 1.5 in leave to much scare tissue to deal with and i want minimal scaring., hell ive shot test thru a 1" 29 ga in the delt!