https://www.cbsnews.com/news/how-drug-companies-keep-insulin-prices-high/ https://www.cbsnews.com/news/how-drug-companies-keep-insulin... Looks like a patent i

https://www.cbsnews.com/news/how-drug-companies-keep-insulin-prices-high/ https://www.cbsnews.com/news/how-drug-companies-keep-insulin... Looks like a patent issue (every new improvement in production methods has its own patent, so the insulins for which patents have expired are lower-quality in one way or another) plus shipping costs (refrigerated bottled liquids with a shelf life <6 months).