Biotest Alpha GPC contains the most potent, highest quality, & most pure form of L-Alpha-Glycerylphosphorylcholine available. Alpha-GPC is a precursor to the neurotransmitter acetylcholine. Clinically, it's been used both orally & intramuscularly to treat Alzheimer's disease, vascular dementia, stroke, transient ischemic attack (TIA), as well as to improve memory, cognitive function, & learning. Clearly, you don't have to be a physician to see that it has profound effects on the nervous system. Alpha-GPC is a much better precursor to acetylcholine &, unlike choline, alpha-GPC raises GH levels substantially