NovoMix indeholder to forskellige former for insulin aspart: den opløselige form, der virker hurtigt (i løbet af 10 minutter efter indsprøjtningen), og den krystallinske form, der optages meget langsommere dagen igennem.
NovoMix contains insulin aspart in two forms: the soluble form, which acts quickly (within 10 minutes of injection) and the crystallised form, which is absorbed much more slowly during the day.