Insuman indeholder forskellige former for insulin: den opløselige form, der er hurtigtvirkende (inden for 30 minutter efter injektion), og isophan - og krystallinske protaminformer, der optages meget langsommere dagen igennem, hvorved de virker længere.
Insuman contains insulin in various forms: the soluble form, which acts quickly (within 30 minutes of injection), and the isophane and crystalline-protamine forms, which are absorbed much more slowly during the day, giving them a longer duration of action.