IM injections should be done using 1inch or 1 1/2 inch needles. The average adult should use 1 1/2 inch.paridhm said:My buddy has 27ga 1/2" vitamin needles and is going to do injections with them. Do you guys think that 1/2" is deep enough in the muscle? If it is, it would have to be in low fat areas like biceps, delts, chest and pectorals.
If not then you could risk it not hitting the muscle.