Why Metformin not Creatine

I've been laid up for @6 months with three spine Operations during which I spent alot of time reading. One interesting fact was the use of Creatine to reduces blood sugars as it's naturally made in the body rather than using Metformin a man made drug. I have used Creatine previously for training on three month cycles and had great gains for training, I'm wondering if any specialists out there have heard of this and why the British health Organisation doesn't investigate into it.

Regards,

Dadio