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Should you take creatine on a GLP-1?

By GyroscopeUpdated November 14, 20265 sources

Maybe, but lifting and protein come first. No trial has tested creatine in people taking semaglutide or tirzepatide yet. If you’re already lifting and eating enough protein, 3 to 5 g a day may add a little, so skip loading and tell your prescriber.

The GLP-1 drugs, semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound), cause big weight loss, and some of what’s lost is lean mass. That’s made creatine one of the first things people reach for to protect their muscle. It’s cheap, it’s well studied, and it sounds like exactly the right tool.

What’s known

In 2026 two researchers, Sergej Ostojic and Shannon Galyean, laid out the case for trying creatine with GLP-1 drugs. Their reasoning is that eating much less, with less protein and less loading on the muscles, may leave muscle short of energy, and creatine supports muscle energy. They were clear that it’s an idea to test. In their words, it’s “hypothesis-generating”, and no randomized trial has tested creatine during GLP-1 weight loss.

There’s an odd detail in a 2026 trial. When Jisun Chun’s team recruited middle-aged adults to test creatine during a weight-loss diet, they excluded two people because they were on GLP-1 drugs. Even the trial closest to the question left those patients out.

What we can borrow from other trials

Creatine works through training. Across 35 trials, it added about 2.4 lb (1.1 kg) of lean mass with lifting and essentially nothing without exercise. In the 2026 diet trial, people on creatine who did the exercise and diet program kept more lean tissue and lost more of their bodyfat percentage than people on placebo. Those were people losing weight by diet, not on a drug, but it’s the closest evidence so far.

It’s like adding a better lock to a door. It helps if the door is shut. If you’re not lifting, the door’s open and the lock does nothing.

Practical points on these drugs

• Your stomach. Single doses over 10 g are the ones that cause diarrhea. In a trial of 59 soccer players, one 10 g dose a day did it to 56% of them. If your stomach is already unsettled, take 3 g, or split 5 g into two servings, and don’t load.
• The scale. Creatine adds some water, which can make a week’s weight loss look smaller. Watch your waist and strength alongside the scale.
• Your kidneys. If you have kidney disease, or your doctor has flagged your kidney numbers, ask before you start. Creatine also raises creatinine on blood tests.

More on muscle and GLP-1s

bodyfat.guide covers whether GLP-1 drugs make you lose muscle, with the scan data from the trials. strength.guide has how to keep muscle on a GLP-1, and protein.guide has how much protein to eat on a GLP-1.