The active ingredient in Humulin N is isophane insulin human, which is a biologic. Humulin N belongs to a group of drugs called intermediate-acting insulins. Humulin N comes as a suspension (a ...

NPH is administered with an insulin pen or syringe to the stomach, thighs, or upper arms. Humulin N is one brand of NPH insulin produced by Eli Lilly and Company, and Novo Nordisk makes Novolin N.