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Evidence-graded writing on nootropics and cognitive performance — what the trials actually show, where the hype outruns the data, and how to read a claim before you buy it.

6 articles · by KÖGN Editorial

LatestEvidenceJune 20265 min read

Creatine softened the cognitive cost of sleep loss in a 2026 trial

A small 2026 trial found a single 0.2 g/kg dose of creatine blunted the cognitive losses of sleep deprivation by up to 12%. The effect is most reliable exactly when you're depleted — and a review notes the gains skew larger in women, who tend to start with lower stores.

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  1. EvidenceJune 20265 min readAn L-theanine blend matched caffeine on attention — without the blood-pressure riseA 2026 randomised controlled trial found an L-theanine-based multi-ingredient blend improved selective attention and executive function comparably to 150 mg of caffeine — but without caffeine's rise in blood pressure. A clean case for stimulant-free focus, with the usual early-trial caveats.
  2. EvidenceJune 20266 min readCreatine and the brain: the energy case gets strongerNew 2026 brain-imaging trials show 5 g/day of creatine raises the brain's own energy reserve and may slow early Alzheimer's decline. The signal is real and worth watching — but still early, and not a treatment claim.
  3. FoundationsMay 20265 min readHow long until nootropics work? Acute vs. chronic effectsSome nootropics work within the hour; others take weeks. Knowing which clock an ingredient runs on tells you when to expect anything — and stops you judging the slow ones too early.
  4. StacksMay 20265 min readCaffeine and L-theanine: the evidence behind the classic stackWhy pairing L-theanine with caffeine is the most reliable beginner nootropic stack — what the human trials show, the ratio people use, and how to take it without leaning on tolerance.
  5. EvidenceApril 20266 min readDo nootropics actually work? What the evidence showsAn honest, evidence-graded answer: which nootropics have repeated human trials behind them, how large the effects really are, and where the marketing outruns the data.

About the Journal

What is the KÖGN Journal?
The KÖGN Journal is KÖGN Health's editorial blog: calm, evidence-literate writing on nootropics and cognitive performance. Every article is written by KÖGN Editorial and leans on the same A+ to C evidence grades used across the rest of the site, so claims stay tied to the published research. How KÖGN grades evidence →
Is the Journal medical advice?
No. The Journal is educational writing about cognitive performance and nootropic ingredients, not medical advice. Speak to a qualified clinician before changing what you take, especially if you are pregnant, taking medication, or managing a health condition.