By Austin Perlmutter, MD · New York Times Bestselling Co-Author of Brain Wash · Read by 160,000+ Newsletter Subscribers

Creatine is having a moment. Your brain deserves better than hype.

Creatine is one of the most-studied supplements in the world, with more than 1,000 peer-reviewed papers. For decades it lived in the gym. Now researchers are asking what it does above the neck.

The answers are fascinating. Some studies are genuinely exciting. Others found no benefit at all. And a few large trials tested big hopes and came up empty. Scroll social media, though, and you’d think creatine is a brain booster for everyone.

I wrote this guide to give you the honest picture: what we know, what’s promising, and where the evidence hasn’t caught up to the marketing.

What you’ll learn inside

Every claim, graded.

Most supplement content tells you everything works. This guide does the opposite. Each chapter ends with an Evidence Check, my honest grade of how strong the science really is, so you can decide for yourself.

Yes, we include what didn’t work. That’s the point.

This guide is for you if…

A peek inside

Frequently asked questions

Get the honest science on creatine and your brain.

20 pages. 35 linked studies. No hype.


This guide is for educational purposes only and is not medical advice. Statements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement. © 2026 Austin Perlmutter MD, LLC.