Dietary Supplement Glycerylphosphorylcholine Supports Cognitive FunctionClinical Research in humans and animals has demonstrated that GPC (l-alpha-glycerylphosphorylcholine) helps support higher brain function, mental acuity, and the release of human growth hormone. GPC is a precursor to the neurotransmitter acetylcholine and the membrane constituent phosphatidylcholine. Research suggests that it is more bioavailable than other forms of choline for the maintenance of learning and memory.