Alpha GPC, commonly used both to improve cognition and to enhance power output in athletes, is a popular cholinergic compound . Specifically, it works by delivering choline across the blood–brain barrier. Choline is an important molecule, used both in the synthesis of cell membranes and as the precursor molecule for acetylcholine, the learning neurotransmitter . In other words, more Alpha GPC means more choline in the brain, and more choline means more learning neurotransmitters—which is why Alpha GPC is used to support cognition. While this nootropic can be found naturally in foods like soy, milk, red meat, and eggs, Alpha GPC intake from diet alone is quite minimal and supplementation is recommended in order to achieve its desirable effects .