* How do I know that every vial has the same concentration of insulin each time? That is to say 1 unit from a vial today and 1 unit from another vial is going to have the same dosing.
* How do I know the insulin is purified? If there’s any host cell protein in the vial, that could be immunogenic and cause bad side effects.
* How do I know that the formulation of insulin in the vial won’t degrade on me at whatever storage condition is stated?
I realize that these tests make up only a small fraction of the price, but there’s a lot of value to purchasing medicine from regulated sources. I’m not against upstart competition against big pharma, but I worry that you might literally kill someone if you don’t include these product quality steps in your process.