Citicoline (CDP-Choline) vs Alpha-GPC
Both graded for Brain & Cognitive
Both products are Grade B for cognition, so the choice hinges on population and secondary goals, not one being clearly better-evidenced. Citicoline is the cleaner pick for age-related memory decline — its cognition claim rests on a well-designed 100-person RCT (Nakazaki 2021, 500 mg/day for 12 weeks showing significant episodic and composite memory gains in adults 50-85), while its support for focus in healthy adults falls to Grade C on a single small 60-woman trial. Alpha-GPC's cognitive evidence is similarly strongest in older, cognitively impaired populations and genuinely mixed in healthy adults (positive on some measures, null on others in small crossovers like Parker 2015 and Kerksick 2024), but it is the only one of the two with a second goal — acute power output and growth-hormone effects (Ziegenfuss 2008, though only n=7). So it depends on why you're taking it: reach for citicoline first for age-related memory, Alpha-GPC if you also want the pre-workout/athletic angle, with the honest caveat that for a healthy adult chasing everyday focus, neither has convincing evidence yet.
Citicoline (CDP-Choline)
A choline-and-cytidine donor with a real RCT base for memory in older adults with age-related decline — thinner and less consistent for focus in generally healthy adults.
Supports memory in older adults with age-related memory complaints
250-500 mg/day is the range used in the positive memory and attention trials. Some clinical (non-supplement) protocols use up to 2,000 mg/day, but that dose isn't supported by consumer-supplement research.
Brain & Cognitive
Alpha-GPC
A bioavailable choline source with some RCT support for cognition and power output — promising but the trial base is still thin for healthy adults.
Supports cognitive function and memory
300-1200 mg/day. Cognitive trials typically use 400 mg three times daily (1200 mg total). Athletic performance studies often use 300-600 mg acutely before exercise.
Brain & Cognitive, Muscle & Athletic Performance
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