Just a story for you guys. Been on TRT of just over 12 months, inject twice a week and I always aspirate. I sort of pin yourself pull back and see and air bubble, no big deal. Today, pulled back and the syringe filled with blood, slightly horrified and thought thank god to myself I always aspirate as I would have had a horrible 10 minutes or so thinking I was going to die. So my lesson learned today, ALWAYS ASPIRATE as the odds are one day you will hit a blood vessel. My odds are about 100-1.