When comparing novorapid vs humalog both are rapid-acting insulins used to manage blood sugar levels in people with diabetes. Novorapid (insulin aspart) typically starts working within 10-20 minutes, while Humalog (insulin lispro) begins in about 15 minutes. The choice between the two depends on individual response, timing of meals, and medical advice. Although similar in function, the slight differences in onset and duration may influence which one is more suitable for a particular patient. Consult your healthcare provider to determine which option is best for you.