Most supplement-for-brain claims collapse under a good trial — but the COSMOS program is the rare exception, finding a daily multivitamin modestly improved cognition in older adults. Here’s what the trials actually found, how big the effect really is, who it applies to, and the conflicting evidence that keeps it honest.
Low vitamin D is linked to worse cognition — but does supplementing help? The honest “signal vs hype” answer: correcting a genuine deficiency is worthwhile, yet supplement trials in already-replete people came up empty. Test first, correct if low, don’t megadose.
The physiology behind intermittent fasting is real — but most of the brain benefits come from rodent studies, not human trials. A researcher’s honest look at what the evidence supports, what it doesn’t, and who should be cautious.
