Alpha GPC 300 mg, 60 Vcaps, NOW FoodsNOW Foods Alpha GPC Dietary Supplement. Cognitive Support. Bioavailable Source of Choline. Supports Mental Acuity. Vegetarian Formula. Alpha GPC is a natural physiological precursor to acetyl choline, a neurotransmitter that is involved in memory and other cognitive functions. Alpha GPC is more bioavailable than other forms of choline and is known to cross the blood brain barrier into the brain. In the brain and other neural tissues, Alpha GPC becomes