Does creatine make you smarter? Insights from the Hacker News discussion

Takeaway from the article

The dynomight piece ends with the author’s conclusion: "I don’t know. Maybe a little." This reflects uncertainty about whether creatine improves cognition.

What the evidence says

Commenters note that the article treats the null result as insufficient evidence to reject the hypothesis of no effect, and argue that the low prior for supplement claims means one should assume the effect is unlikely unless strong data appear. One comment quotes Ernest Rutherford: "If your experiment needs statistics, you ought to have done a better experiment." Another points out that if creatine had a large, personally noticeable effect, research would focus on estimating the size rather than struggling to distinguish it from placebo.

Anecdotal reports of cognitive effects

Several users describe subjective improvements linked to creatine:

• A user with severe sleep apnea and insomnia reports a "significant uptick in my cognitive abilities" despite averaging only 3.5 hours of sleep per night.
• Another says they take 5–10 g when expecting short sleep and notice fewer headaches the next morning.
• A commenter notes less cognitive impairment after poor sleep when taking 10 g per day.
• One individual reports feeling "sharper and able to perform mentally at a higher level for longer" after a year of 1500 mg creatine HCl daily.
• Some mention that creatine seems to help fight off headaches during sleep deprivation.

These reports are anecdotal and not backed by controlled data in the thread.

Potential mechanisms and limitations

Discussion also raises factors that could explain or limit any observed benefit:

• Hydration: One comment argues that the perceived benefit may come from increased water intake rather than creatine itself.
• Baseline levels: A user suggests that Rae et al.’s cohort had lower baseline creatine because they consumed less animal protein, implying that supplementation might only help those with low dietary intake.
• Placebo: Another notes that believing in a benefit could produce a placebo effect, especially when taking creatine for other reasons like strength training.
• Prior writing: Gwern’s earlier analysis is cited as reaching a similar conclusion.
• Specific studies: McMorris et al. (2006) and Gordji‑Nejad et al. (2024) are mentioned as showing possible benefits under stress or sleep loss, though the article did not cite them.
• Biological detail: A comment jokingly mentions the actin‑myosin sliding filament theory as a missed opportunity for explanation.
• Nutrition alternative: One user prefers obtaining creatine from pickled herring or steak rather than powder.
• Vitamin D speculation: A user wonders whether sunlight or vitamin D influences creatine storage or processing, possibly affecting results in Australian studies.

Safety and side effects

The thread includes both reassurance and caution:

• One comment states that creatine has "no proven negative side effects" unless taken in excessive amounts.
• Another raises a kidney‑safety question, asking whether creatine is bad for the kidneys.
• A user reports a noticeable rise in blood pressure when taking creatine, noting that increased water intake did not resolve it.
• An anecdote links creatine use to accelerated hair loss in a young adult, which slowed after stopping supplementation.
• Long‑term adaptation is questioned: whether the body adjusts to creatine over time, requiring higher doses for the same effect.

Conclusion

Overall, the Hacker News discussion mirrors the article’s tentative stance: there is no convincing evidence that creatine makes you smarter in the general population, but some individuals report subjective cognitive improvements, particularly when sleep‑deprived or under stress. The possible role of hydration, baseline creatine levels, and placebo effects are repeatedly mentioned, and safety concerns remain anecdotal and unresolved.