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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.
It depends on which insulin to use. There are 3 kinds. Regular insulin has an onset of action (begins to reduce blood sugar) within 30 minutes of injection, reaches a peak effect at 1-3 hours, and has effects that last 6-8 hours. NPH insulin is an insulin with an intermediate duration of action. It has an onset of action starting about 2 hours following injection.