In in vitro tests, including binding to insulin receptor sites and effects on growing cells, insulin lispro behaved in a manner that closely resembled human insulin.
In vitro katsetes, mille käigus vaadeldi ka seondumist insuliiniretseptoritega ja toimeid kasvavatele rakkudele, toimis insuliin lispro sellisel viisil, mis sarnanes lähedaselt humaaninsuliinile.