You don’t have to lift weights to benefit from creatine. This supplement has been a go-to for bodybuilders and athletes looking to gain muscle for decades. But beyond the gym, new research suggests it may also enhance memory, improve sleep, and support mental health.

Creatine is usually used to boost muscle performance, but now it's being linked with being able to think clearly after a poor night of rest. Here’s what the study found, plus what a neurologist wants you to know.

For most healthy people, creatine is safe and well-tolerated when used as directed. The most common side effects of creatine supplementation are slight weight gain (creatine temporarily draws water into your muscles), stomach bloating, and dehydration.