Creatine isn't just for bodybuilders. Here's what it actually does.

It's the most researched supplement in sports nutrition, and the list of people who might benefit is a lot longer than the gym crowd.

The short version

• Creatine helps your muscles recycle energy during short, intense effort, which is why it improves strength and power over time.
• Creatine monohydrate is the form with the most research behind it. 3 to 5 grams a day is the standard dose.
• Loading is optional. Daily consistency matters far more than timing.
• The big worries (kidneys, hair loss, dehydration) haven't held up in research on healthy people at normal doses.

Say "creatine" and most people picture a tub of powder next to a squat rack. That reputation is fair, since creatine really is one of the few supplements that reliably helps with strength training. But it's also incomplete. Your body makes creatine every day, it's in the food you eat, and researchers are now looking at what it does for aging muscles, busy brains and people who don't eat meat.

Here's what creatine is, what the evidence says, and how to take it without overthinking it.

What creatine is

Creatine is a compound your liver and kidneys build from three amino acids: arginine, glycine and methionine. You also get it from food, mostly red meat and fish. Between what you make and what you eat, a typical person takes in about 2 grams a day.

About 95% of your body's creatine is stored in skeletal muscle, much of it as phosphocreatine. The rest sits in the brain and other tissues that burn through energy quickly.

How it works

Every muscle contraction runs on a molecule called ATP. When you sprint, jump or lift something heavy, you use up ATP within seconds. Phosphocreatine donates a phosphate group to rebuild ATP fast, which lets you squeeze out a little more work before fatigue sets in: one more rep, a slightly faster sprint, a stronger final set.

Supplementing raises the amount of creatine stored in your muscles, typically by 20 to 40%. That extra reserve doesn't make any single workout dramatically different. Over weeks and months, though, a bit more work per session adds up to more strength and more lean muscle.

What the research says

Creatine has been studied for more than 30 years, across hundreds of trials. The International Society of Sports Nutrition calls creatine monohydrate the most effective nutritional supplement available for increasing high-intensity exercise capacity and lean body mass. Here's where the evidence is strongest, and where it's still developing.

Strength and power

This is the well-established part. Paired with resistance training, creatine consistently leads to greater gains in strength, power and muscle mass than training alone. The effect shows up most in short, repeated bursts: lifting, sprinting, team sports.

Healthy aging

Adults lose muscle gradually from middle age onward. Several studies in older adults suggest that creatine combined with resistance training helps preserve muscle and strength better than training alone. Creatine without exercise does much less, so think of it as a way to get more out of the work, not a replacement for it.

The brain

Your brain uses a large share of your body's energy, and it stores creatine too. Early research suggests creatine may support memory and mental performance, especially under stress such as sleep deprivation, and in people with low dietary intake. The results are promising but mixed, so treat this as an area to watch rather than a settled benefit.

Vegetarians and vegans

Because dietary creatine comes almost entirely from animal foods, people who don't eat meat tend to have lower muscle creatine stores. They often see a larger response when they start supplementing.

How to take it

Choose creatine monohydrate. Newer forms like creatine HCl and buffered creatine are marketed as better absorbed, but none has shown a clear advantage over plain monohydrate, which is also the cheapest. Micronized monohydrate is the same thing ground finer, so it mixes more easily.

Take 3 to 5 grams a day. That's roughly one level teaspoon. At this dose, your muscles become fully saturated in about three to four weeks.

Loading is optional. If you want faster results, you can take about 20 grams a day, split into four doses, for five to seven days, then drop to 3 to 5 grams. You'll end up in the same place either way; loading just gets you there sooner and is more likely to upset your stomach.

Timing barely matters. Before your workout, after it, with breakfast: pick whatever you'll remember. Taking it with a meal may help a little with uptake. The one thing that matters is taking it every day, including rest days.

Mix it with anything. Water, coffee, a smoothie or a protein shake all work. Creatine is flavorless and doesn't need to be cycled on and off.

Four myths, checked

"Creatine damages your kidneys."

Studies in healthy people taking recommended doses, some lasting years, haven't found kidney harm. The confusion comes from lab work: creatine can raise blood creatinine, a marker doctors use to estimate kidney function. The number goes up without the kidneys actually working any worse. If you get bloodwork done, tell your doctor you take creatine. If you already have kidney disease, talk to your doctor before starting.

"It makes you bloated."

Creatine pulls water into your muscle cells, so many people gain a pound or two in the first few weeks, a bit more with loading. That water sits inside the muscle, not under the skin, so it isn't the puffy look people worry about.

"It causes hair loss."

This idea traces back to a single 2009 study of rugby players that reported a rise in DHT, a hormone linked to hair loss. That study didn't measure hair loss at all, its finding hasn't been replicated, and no study has shown creatine causing hair loss.

"It causes cramps and dehydration."

Research, including studies in athletes training in the heat, hasn't supported this. Drink water normally and you're fine.

Who should check with a doctor first

Creatine is one of the most studied supplements on the market, but it's still worth a conversation with your doctor if you have kidney or liver disease, take medications that affect the kidneys, are pregnant or breastfeeding, or are under 18.

The bottom line

Creatine is inexpensive, well researched, and useful to a wider range of people than its reputation suggests. Take 3 to 5 grams of monohydrate every day, keep training, and give it a month. Most of what you'll notice is a steady, quiet improvement in what you can do.

Sources

1. Kreider RB, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017.
2. Antonio J, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021.
3. van der Merwe J, et al. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clin J Sport Med. 2009.
4. Candow DG, et al. Creatine supplementation and aging musculoskeletal health. Endocrine. 2014.

*These statements have not been evaluated by the Food and Drug Administration. This content is for general education and isn't medical advice. Talk with your doctor before starting a supplement, especially if you're pregnant, nursing, take medication or have a medical condition.