For glutes you will definately need a 1 1/2 but could get away with a 1 1/4, the guage for injecting needs to be as close to 23g as you can get. Too big and its a bit like a harpoon and too small and you will have trouble getting the gear to pass through a small needle, especially if its oil based.
J
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50% of Training is nutrition
50% of Training is not overtraining
If you cant gain see the above.
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