What does creatine actually do?

Creatine is not a steroid, and it is not a shortcut around using your muscles. Think of it as support for the quick energy system your muscles use during repeated hard efforts.

That makes it relevant to activities such as resistance training. It does not mean every walk, weight-loss plan, or person taking a GLP-1 needs a scoop.

What the research can support

A review of 22 trials in older adults found more improvement in lean tissue and some strength measures when creatine was added to resistance training than with training alone. The participants were exercising; this was not a trial showing creatine alone prevents muscle loss during GLP-1 treatment.

NIH describes creatine’s best-supported role in repeated, short, intense efforts. It can also increase water weight. A scale increase after starting it is not automatically fat gain, and a lean-mass increase is not necessarily all newly built muscle.

Does it belong in your routine?

Start with adequate food, protein, and an appropriate strength routine. Then discuss whether creatine adds something useful for your goals. Kidney disease, pregnancy, and other medical circumstances deserve an individualized conversation before starting. Tell your clinician about it when discussing laboratory results, and follow appropriate product directions.

I use it in the shake routine described here. That explains my setup; it does not make it a requirement for yours.

One useful question: “What am I expecting this to help me do?” If the answer is “lose fat while changing nothing else,” this is the wrong job for creatine.

Sources checked September 19, 2026. General education; your own care plan comes from your clinician.