Alpha GPC Glycerylphosphorylcholine Supports Cognitive Function Clinical 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.* 285 mg Capsule Option Available: Suggested Use: 2 capsules twice daily for the first 4 weeks, thereafter 1 capsule twice daily. Allergies: Contains soy. Contains no yeast, dairy, egg, gluten, corn or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.