I was wondering if a skinny guy was injecting with the proper size needle can he hit the bone?
1 1/2 for the glute seen long. And if you draw blood you pull out and inject another site but can you still use same juice with the blood in it?
If you've got that problem you might want to stick to large muscle groups.
Common sense?
Stay with 5/8 or 1 inch needles.
You can use the same injection, but why haven't you built enough muscle to where the needle isn't an issue?
DIV