m not a medical professional, just
the parent of a kid with diabetes.
Humalog and Novolog are different types of fast acting insulin, meaning that they are quickly absorbed into your system to immediately drop your blood sugar. Some people find that one works more effectively than the other, so which is used is really up to the patient. Humulin, more commonly called Humulin NPH, and even more commonly called just NPH, is a long acting insulin.