I prefer deeper injections. There have been countless discussions on this topic, so I suggest searching it and reading different opinions before forming your own. Generally, these medications are intended for intramuscular use, and in my experience, deeper injections result in less post-injection pain and other complications. Subcutaneous leakage can happen with 1/2-5/8 and even 1” in some areas. I use 27 or 25g 1” for delts, lats, biceps, triceps, and everything except quads and glutes, where I use 27 or 25g 1 1/2”. Needle size shouldn't intimidate you. The absorption of fats and oils has always puzzled me, but it seems newer users are leaning toward insulin pins and subcutaneous injections as the norm. While it does absorb, I consistently see more issues with shallower injections than deeper ones. More blood flow generally means faster absorption, and muscle tissue has significantly more blood flow than subcutaneous fat. A tip I have is to hold the needle next to the muscle you’re pinning; unless you’re extremely thin, even a 1 1/2” needle isn't likely to hit bone when injecting quads or glutes. Same goes for 1” needles in other areas. I’ve occasionally used a 1/2” or 5/8” in a pinch, but they tend to have more issues, so I stick to what works for me.
