I WOULD USE WHAT BOOMSHAKER SAID A 30G NEEDLE WOULD BE TO SMALL AND YOU WOULD NOT BE ABLE TO DRAW IT UP IN THE SYRINGE. I WOULD USE THE 23G 1/2 INCH FOR LEGS,SHOULDERS,AND BICEPS, AND USE 1 INCH AND 1/2 FOR THE GLUTES.
me personally, I use a 25g. I have far less tissue damage when i started using that size. It may take longer to inject, but who cares, it's not a race. I wish that I used the 25 g (1 inch) from the get go.