Creatine Benefits: What Research Shows, Side Effects and Myths

Creatine benefits are most clearly documented for strength and short bursts of hard exercise, especially when creatine is paired with resistance training. Creatine is a compound your liver and kidneys make and that you also get from meat, and supplements raise the amount stored in muscle. Well over 100 trials show modest gains in strength and lean mass, newer studies look at older adults and memory, and the safety record in healthy adults is reassuring. Several popular worries, such as hair loss, kidney damage and cramping, rest on thin evidence. Here is what the research says, where it is weaker than the marketing, and who should check with a clinician first.

Peptide Labs sells no creatine products, so nothing in this article is a product recommendation. It is general information, not medical advice.

What is creatine monohydrate?

Creatine is not a hormone or a drug. A 2021 review by researchers associated with the International Society of Sports Nutrition (ISSN) explains that the body forms it from three amino acids, arginine, glycine and methionine, mainly in the kidneys and liver, and that people also eat it in meat. Muscles store it as phosphocreatine, a quick reserve used to rebuild energy during sprints, lifts and jumps. Vegetarians tend to have lower creatine levels because their diets contain little of it.

Creatine monohydrate is creatine bound to a water molecule, and it is the form used in most research. The same review states that about 99% of it is absorbed into the blood. Because creatine has a completely different chemical structure from testosterone, it is not an anabolic steroid.

Creatine benefits for strength and muscle

The ISSN position stand from 2017 concluded that supplementation raises muscle creatine stores, which may explain improvements in high-intensity exercise performance and training adaptations. Several of its authors have industry roles, but the core finding has been repeated in many independent analyses.

A 2017 meta-analysis in Sports Medicine pooled 53 studies with more than 1,100 participants and found that creatine improved upper body strength in exercises lasting under three minutes, regardless of age, sex or training plan. A 2024 meta-analysis of 143 randomized trials found a gain of a little under one kilogram of fat-free mass and a slightly lower body fat percentage, which its authors called a small effect that was larger in people doing resistance training. Part of the early scale change is water, which our guide to creatine and weight explains in detail.

Older adults and muscle preservation

Muscle and strength decline with age, and creatine research has shifted toward that problem. A 2019 meta-analysis of 19 studies with 609 adults aged 50 and older found a slightly lower body fat percentage when creatine was added to resistance training. A 2026 analysis of seven trials with 608 postmenopausal women found small gains in lean mass and leg strength when creatine was combined with training, but not in trials without training, and no overall change in bone density; a creatine manufacturer supported its publication. The message is consistent: creatine works alongside exercise, not instead of it. This also matters for people losing weight quickly on GLP-1 medicines; see our guide to muscle loss on Ozempic for what protein and resistance training can do, and our GLP-1 diet guide for nutrition basics. No trial of creatine in people taking GLP-1 medicines was located.

Creatine and the brain

The brain also uses creatine for energy, which has prompted memory and thinking studies. The findings are interesting but not settled:

• A 2018 systematic review of six trials with 281 healthy people found that short-term memory and reasoning may improve, results in other areas conflicted, young adults showed no change, and vegetarians responded better than meat-eaters on memory tasks.
• A 2023 meta-analysis in Nutrition Reviews found better memory scores overall, driven by adults aged 66 to 76, with no effect in people aged 11 to 31. Other researchers questioned its statistics in a published letter, and the authors replied.
• A 2024 meta-analysis of 16 trials found improvements in memory, attention and processing speed but not in overall cognitive function.
• Also in 2024, the European Food Safety Authority reviewed a health claim submitted by a creatine manufacturer and concluded that a cause-and-effect relationship with improved cognitive function has not been established.

Creatine is also being studied in several medical conditions, but that research is early and is not a reason to use it without a clinician’s input.

Creatine side effects and safety

Creatine side effects in healthy adults are usually mild. The 2021 ISSN review lists water retention during the first several days as the most common one, and large single servings may cause stomach upset or diarrhea. Beyond that, the review addresses several worries one by one.

Does creatine cause hair loss?

The concern traces back to a single 2009 study of college rugby players. After a week of creatine, their levels of dihydrotestosterone (DHT), a hormone linked to male pattern baldness, rose by 56% and stayed 40% above baseline two weeks later, while testosterone did not change. Only 16 men completed the study, hair was not measured, the DHT values stayed within normal clinical limits, and the result has not been replicated. The ISSN review states that no study has reported hair loss in humans. That is reassuring, though not the same as proof, since no trial has been designed to look for it directly.

Kidneys, lab tests and fluid balance

• Kidneys: controlled studies have not found kidney damage in healthy people at the intakes researchers recommend. A 2026 meta-analysis found that creatine raised blood creatinine but did not change other kidney measures it checked.
• Lab tests: because creatine breaks down into creatinine, a common kidney marker, tell your clinician you use it before blood work so results are read correctly.
• Existing kidney disease: the review describes a man with long-standing kidney disease whose kidney estimates worsened after starting creatine. Anyone with kidney disease, or taking medicines that affect the kidneys, should ask their doctor first.
• Dehydration and cramps: early-2000s cautions were based mostly on speculation, and later studies did not find that creatine causes dehydration or cramping.
• Pregnancy and children: there are no well-designed trials in pregnancy, and the ingredient’s food-safety status in the US excludes infants and young children. Teens should involve a pediatrician.

Choosing a creatine product

Shelves are full of creatine salts, buffered creatine, creatine ethyl ester and creatine nitrate sold as upgrades. According to the ISSN review, no peer-reviewed study shows that any of these raises muscle creatine more than the same amount of monohydrate, and most show less effect. If you use creatine, the plain monohydrate form is the one the research describes. Supplements are not approved by the FDA before sale, so a third-party seal helps confirm what is in the tub; our guide to third-party tested supplements explains the main programs. Creatine is often compared with L-carnitine, which has a much weaker record for body composition, and with nitrate-rich beetroot, which is studied for endurance rather than strength.

Frequently Asked Questions

Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Last reviewed October 2026.

Related guides: Creatine for Weight Loss: Water Weight, Fat Loss and Muscle, Ozempic Muscle Loss: What the Body-Scan Data Show, Third Party Tested Supplements: What USP, NSF and Other Seals Mean.