5/8" in length but what size in gauge? If I try to inject subq with any gauge lower than 27g, it's too big and causes issues for whatever reason. 27g-28g is nice for everything. Subq 1/2" is nice. For IM I have always needed 1inch or longer. 1.5" I will have to hold it out some in some locations. If you inject too deep near bone it sucks too lol.Funnily enough, I used to massage the area after injections and one day for shits and giggles I googled it and it says to not do that, for whatever reason. Pressure is fine, but no rubbing.
I am still running 5/8" needles. Always have. I don't have a considerable amount of body fat and the places I do, I don't inject there. I have wondered if I am getting the injections far enough in a handful of times.