Sorry, I haven't ever used insulin as a diabetic type 2 so I don't know much about it. I only have experience with type 1 diabetics who use insulin.
Sometimes it is used in hospitals when drugs make the blood sugar too high. Other than that, my family relies on a low carb diet and plenty of activity.
Our bodies react differently to different drugs and also to different foods. We react differently to carbs in the diet and how much fat is in the food we eat.
A balanced diet of protein, vegetables, low carbs, and fruit without much sugar works well with practice and patience. Dorisena