"Walmart sells an old version of human insulin for $25, but as Lipska explained, it doesn’t work for all patients and is incompatible with many new delivery devices."
It's much worse. The big thing with insulin is being shelf stable vs fast acting. The insulin your pancreas produces is really fast acting, but the Wal-Mart stuff is slow acting. With the fast acting stuff you can manage your blood sugars to a tighter degree. This might not sound like much, but over a lifetime it adds up to many fewer medical complications. It's true the Wal-Mart stuff will work in a pinch (if you know how to use it), but issuing it long term will likely take years off your life.
"Walmart sells an old version of human insulin for $25, but as Lipska explained, it doesn’t work for all patients and is incompatible with many new delivery devices."