I've recently begun a TRT program involving once-per-week cypionate injections -- and I'm having some trouble.
I was told glutes, quads, and deltoids were acceptable sites for injection. For best convenience, I chose quads. Trouble is, I seem to have an uncanny knack for locating veins with my needles. In at least three of my five injections so far, I seem to've hit a vein going in -- on the way in (slow and easy), there's big pain attended by an involuntary contraction of the muscle.
When this happens, I remove the needle and find another spot to inject -- and on removal in these cases, several drops of blood are ejected. Successful injections, on the other hand, are blood-free and virtually painless.
Can someone offer advice for improving injection success? For what it's worth, I'm using 25g pins to inject 100mg cypionate once per week. I've been injecting roughly mid-thigh, slightly outside of center, to hit the Vastus lateralis.