Glucotor is no v1agra substitute, or ED panacea for that matter. It's specific purpose is blood glucose control without the need for lamestream meds and their toxic side-effects. It may help with ED indirectly coz high blood Sugar is one of the things you need to control to regain healthy micro (ie capillary) circulation, but it was never specifically intended for that purpose, and as far as I know has no effect on NO production.
I only mentioned it coz of your reference to pre-diabetes as a continuing health issue. Slightly OT, and probably the reason for the confusion, so apologies.