The other day I had to shoot my Prozinc dose back into the bottle due to an air bubble, I read that was okay, but ever since then my vial has little air bubbles hanging out at the top. Now when I pull the insulin up, I get an air bubble. I manage to release the majority of it but tonight there was a little tiny one hanging out near the plunger...it wasn't nearly big enough to mess with my measurement so I decided it wasn't worth wasting the insulin. I know it's dangerous to have air bubbles when you're injecting into a vein...but since it's just under the skin, that's okay right? As long as the correct dose is being given. Has anyone ever experienced air bubbles in a Prozinc vial? Should I pick up a new one? I still have half of this one left... I'd hate to waste it.