I used to use Humilin with syringes, but my sites atrophied so I was switched to novolog ? (slow acting), which I was told was also humanized insulin. Then I went to the Minimed pump and started on Novolog (fast acting) and it works great with my body. I think they are both humanized insulins: Humilog and Novolog. I didn't think doctors use beef and pork made insulins anymore. Wow. I guess they could, but why?