What is the peak for NPH insulin?

NPH insulin, or Neutral Protamine Hagedorn insulin, typically has a peak action time of about 4 to 8 hours after injection. This means that its maximum effectiveness in lowering blood glucose levels occurs during this time frame. The onset of NPH insulin is usually around 1 to 2 hours, and its duration of action can last up to 12 to 16 hours. It's important for patients to monitor their blood sugar levels, especially during the peak period.