It's all about money and greed.  I'm sure it is easier and cheaper to manufacture the DNA stuff even though the natural insullin (pork and beef) works much better for most diabetics.  I believe the FDA is scared of the big drug companies.  In the beginning I even thought the DNA stuff was going to be better (wishful thinking).  It had to be because the drug companies said it would and so did the doctors.  When you read the word Humulin it sounds like human and this insulin is not human insulin.  It hits really hard and has no duration.  The natural insulin doesn't hit as hard and has long duration.  The natural insulin isn't perfect but it does work better.  I believe Eli Lilly knows they messed up and will never admit it.  Eli needs to make the natural insulin or step back and let a country like Europe make it here.  It is expensive to import it from Canada but is worth it.  We (people with diabetes) should have a choice and not have it made for us.  Our body belongs to us and not the drug companies.