I've use Glycobol and I have meter with accucheck meter and test strips it does work for GDA in fact it was my diabetes type 2 that led me to it I had tried several things and finally discovered Glycobol was the only thing I used so far that acutually lowered my blood sugar. But you have to be diligent and take two caps before every meal the doctors prescribed med metformin took my blood sugar from 300 to 200 but glycoblol lowered it in conjunction with metformin to 100-138 I haven't tried agmatine but plan to I will let everybody no what the meter says