Alpha-GPC is used by athletes to increase growth hormone production. It does this by inhibiting a brain chemical that normally blocks the increase of GH.
Alpha-GPC has some other benefit for demetia, Alzheimer's, stroke and other mental and cognitive support issues.
For athlete's the recommended dose 250-500mg one hour before workouts and before bed.
For other heatlh benefits and dosages, visit the WebMD page.