I personally like 27 gauge x 1/2" for shoulders.
But 25 gauge x 5/8" will do fine, or even 25 x 1/2", if you can find them....................................... JP
A 23 gauge is pretty big for shoulders. I would use a 25 or 27 gauge.
A 1 inch needle length is good for muscle groups that have quite a bit of fat covering them like glutes. For muscle groups that have very little fat covering them like shoulders, a 1/2 or 5/8 inch is best.
You can inject up to 1cc per shoulder per injection. Inject into the dead centre of the middle deltoid head.
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