OK there is a ton of information out there, and im going to try and help you out.
With Type 1 diabetes, your insulin dependant.... this however doesnt mean you will have great glycemic control. Even as a type 1 you can become insulin resistant. This is where AMYLIN can help. However, supplements like Recompadrol and ALA can increase AMPk and aid in glycemic control by increasing glut4 translocation.
With type 2, you can be controlled with oral, insulin, or both. Again this doesnt mean you can have good glycemic control. it all gets ver confusing with all the different insulins. but if you need help i can help you.
First defense is your diet, if diabetic, i personally recommend 3 meals a day no snacks (unless using insulin and training fairly close to it where the insulin is still active, this can cause hypoglycemia). If your type 2 diabetic on a SU, you need to watch your meal timing and your workouts.
For type one diabetics, a low glycemic load diet is great (low carb with no insulin can cause diabetic ketoacidosis... no bueno).
Type 2, best initial diet is a paleo followed by a moderate ketogenic diet. This will aid in best glycemic control.
If these dont work.... then
This is where supplements come in.
Type 1 diabetic review