The honest answer depends entirely on who was being studied, and that distinction gets lost more often than it should.
In healthy adults: roughly 250–630 mg a day
Trials looking at Alpha-GPC and cognitive performance in healthy adults have generally run in that range — a 2024 study at 315 mg using a Stroop task, a 2018 dose-comparison at 250 and 500 mg, a 2023 trial in cyclists at 300 mg.
In clinical populations: 800–1,200 mg a day
Higher-dose trials do exist, and they are the ones most often quoted in marketing. They were run in people with diagnosed cognitive impairment — a different population, with different baseline physiology, being measured on different endpoints.
Quoting those numbers at a healthy adult buying a focus supplement is not a small imprecision. It borrows the authority of research that was not about them.
Why this matters when reading a label
A useful check, in order:
- Which form — Alpha-GPC, citicoline or bitartrate?
- Is the amount printed at all, or hidden in a blend?
- Does the amount sit in the range studied in people like you — not the range studied in a clinical population?
The first check is the one that changes what you actually bought. The third is the one most often used to sell you something.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Sources for every figure, with the population studied in each, are on our citations page.