When I get the pen, are the different guidelines for drawing up a drop? My understanding is that you do not shoot air into the pen vial.Yes, it will last up to 6 months refrigerated. I use every last drop of mine and it's usually around the 6 month mark.
The 28 day guideline is like Carla said, for humans carrying it in their pocketbook or briefcase unrefrigerated.
no, you don't have to shoot air into the pen. I think you will like using the pen. .My understanding is that you do not shoot air into the pen vial.