Short answer: Individual experiences only. Reported impressions are not clinical evidence, and cognition in particular is highly susceptible to expectation effects — a direct, unusually specific disclosure.
Why "cognition in particular" is a genuinely specific, honest callout
This distinguishes cognitive self-reports from more objective measures — a genuine, checkable reason cognitive supplement reviews deserve extra scrutiny.
A genuine reviewer account that models this exact skepticism
"I feel a bit sharper in the afternoons, though I've also been sleeping better, so I can't say it's only the capsule" — Donna K.'s account directly demonstrates this same honest, careful self-assessment.
💡 Worth knowing: this same skepticism is worth applying to any cognitive supplement's customer reviews, not just this specific product's.