Creatine on a GLP-1: Muscle, Evidence, and Cost Per Serving

People taking a GLP-1 medication lose weight, and some of that weight is lean mass. Creatine is the supplement most often suggested for holding on to muscle. The short answer: creatine has strong evidence for building lean mass and strength when paired with resistance training. It has not yet been tested in people taking GLP-1 medications.

Here is what the research covers, where it stops, and how to compare what you would pay per serving.

Why lean mass comes up on a GLP-1

• Some of the weight lost is lean mass. Across GLP-1 trials, lean mass made up roughly 15% of the weight lost in some studies and 40 to 60% in others (Neeland et al. 2024).
• The size of the loss may not be unusual. The same review notes the muscle loss looks roughly in line with what age, health, and the amount of weight lost would predict (Neeland et al. 2024).
• Protein and strength training come first. Neither creatine nor any other supplement stands in for eating enough protein. Our protein guide covers that side.

What creatine does, and the evidence behind it

• With resistance training, it adds lean mass. A meta-analysis of 22 trials in adults with average ages of 57 to 70 found about 1.4 kg more lean tissue with creatine plus training than training alone (Chilibeck et al. 2017). Strength gains were modest but real.
• Training is part of the result. Every trial in that analysis paired creatine with resistance training. The evidence does not say creatine builds muscle on its own.
• None of it was done in GLP-1 users. No completed study has tested creatine in people taking these medications. The first small trial is still recruiting (NCT07625202).

How creatine is usually taken

The International Society of Sports Nutrition describes two common approaches (Kreider et al. 2017):

• Steady: about 3 grams a day, which fills muscle stores over 3 to 4 weeks.
• Loading: about 20 grams a day split into four doses for 5 to 7 days, then 3 to 5 grams a day.

Creatine monohydrate is the form nearly all of this research used. Ask your prescriber before starting, especially if you have kidney disease.

Safety and the lab test to know about

• Kidneys in healthy people. At recommended doses, reviews find no evidence of kidney harm in healthy people (Kreider et al. 2017) (Antonio et al. 2021). People with existing kidney disease were not the focus of that research.
• It can change a blood test. Creatine can raise serum creatinine, a common kidney marker, without any kidney damage (Antonio et al. 2021). Tell your care team you take it before blood work, so a higher number is read correctly.
• Weight on the scale. Creatine draws water into muscle, so a small early gain in scale weight is common (Kreider et al. 2017). It is not fat.

Current prices per serving

Current lowest prices per serving from our tracked catalog:

The full list, with filters by form and brand, is on the creatine category page.

How to compare creatine products

• Check grams of creatine per serving. Some products are blends. The creatine dose is what the research is about.
• Count the gummies and capsules. A serving is often four or more gummies or capsules. Compare servings in the package, not the count on the front.
• Powder is the plain option. Unflavored monohydrate powder mixes into drinks and is the form the studies used.
• Look for third-party testing. A seal such as NSF Certified for Sport means an outside lab checked the label. It says nothing about effect.