I use very small doses of basal insulin. No more than 2.5 units a day. But though I've been able to make an insulin pen last long enough to use up every drop of insulin in it, my experience with vials over the past several years has been that the insulin in them always goes bad, no matter what I do to try to keep them alive.I've tried all of the following: Alway using a new syringe, wiping the
