I have been injecting testosterone cypionate with a 1/2" (12.7 mm) needle into my thighs, delts, and glutes for two years with no problems. My skin/fat layer in my thighs, delts, and glute are 2.2 mm, 2.2 mm, and 4.5 mm, respectively. All my injections with the 1/2" needle are IM. It may...