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What is the best time to take Insulin? The best time to take ordinary insulin is 30 minutes before food, so the level of insulin and sugar in the blood after food intake matches . But in case you have eaten already, it is better to take the injection immediately after, rather than not taking.
Best Answer: Regular human insulin starts in 30 minutes and lasts about four hours with a peak between 1 and two hours. There are faster rapid insulins that work in 10 minutes. Common brands of regular human insulin are Novolog, type R, Humalog, and Novolin. Intermediate insulin like NPH takes two hours to start working, rises steadily to a peak in 9 hours and back down at the same rate for a total of 18 hours.