GPC, or glycerophosphocholine, is a supportive nutrient for the brain, kidneys, muscles, testes, and other organs, and it is a building block for cell membrane phospholipids.* Without the presence of this nutrient in the brain, individuals could not think, sleep, or remember. Designs for Health’s GPC comes in both capsule (each capsule contains 300 mg) and liquid form (containing 600 mg per 2 dropperfuls). The maintenance dosage of GPC is 300 mg to 600 mg per day, with a higher dosage in the range of 600 mg to 1,200 mg per day. The typical oral dose of GPC used in most trials is 1,200 mg per day in divided doses to maintain high blood levels throughout 24 hours.