alpha gpc choline capsules - 60 count, 600mg servings - brain booster aid that supports focus, memory, motivation, and energy - (made in the usa) brain support supplement by double wood supplements double wood supplements alpha gpc is the most bioavailable form of choline currently available. choline is a water soluble nutrient which acts as a precursor to the neurotransmitter acetylcholine. acetylcholine plays an important role in many cognitive processes including memory, intelligence, and mood. alpha gpc is generally regarded as the most potent form of choline due to its ability to rapidly pass the blood brain barrier.