Creatine is one of the most studied sports supplements on the planet. It is also one of the most feared, mostly regarding the kidneys, hair and weight gain. This guide sorts through the evidence for creatine benefits and side effects: proven benefits, emerging benefits, real side effects, and how much is safe to take each day.

The benefits of creatine that are most proven are increased strength, power and lean muscle gain when combined with resistance training. Promising limited evidence for healthy aging and brain function.  The most common side effects are mild: 1–2 kg of water weight in the first weeks and stomach upset from large single doses. In healthy adults, creatine at doses of 3–5 g per day has not been shown to damage the kidneys, although it may slightly raise blood creatinine on tests. People with kidney disease or under 18 should consult a doctor first.

What Is Creatine and How Does It Work?

Creatine is a natural substance your body produces and stores primarily in muscle. It enables muscles to generate fast energy for brief, intense efforts like a heavy lift or a sprint.

How creatine makes energy

Creatine is made by your liver, kidneys and pancreas from three amino acids: arginine, glycine and methionine. Around 95% of it is stored in skeletal muscle, much of it as phosphocreatine. During short, intense effort, phosphocreatine rapidly rebuilds ATP (adenosine triphosphate, the molecule cells use as instant fuel). More stored creatine means ATP can be replenished faster for a few extra seconds of hard work.

The body produces roughly 1 gram of creatine a day. The rest comes from diet. Creatine supplements increase muscle stores beyond what food alone typically provides.

Food sources — and why Indian vegetarians start lower

Creatine is in red meat, fish and poultry. Almost none in dairy and pulses and plant foods. This is important in India, where lacto-vegetarian diets are common.

In a controlled trial, vegetarians had lower baseline muscle creatine than meat eaters and gained more muscle creatine, lean mass and work capacity when they were supplemented. So for vegetarians in India, creatine is less of a bonus and more of a dietary gap filler.

If you eat vegetarian, creatine works alongside a protein-rich diet, not in place of it. For meal ideas, see our guide to protein sources for vegetarians.

Benefits of Creatine (Ranked by Strength of Evidence)

Not every creatine benefit is equally proven. The table below grades each one by how strong the research is today.

Strength and power

Strength and power gains have strong evidence. Creatine helps you do more work in brief, all-out efforts such as lifting, sprinting, fast bowling in cricket or football. The International Society of Sports Nutrition (ISSN) position is that creatine monohydrate is the most effective supplement available for enhancing high-intensity exercise capacity. In practice, that’s usually one or two extra reps per set, which adds up over months of training.

Lean muscle gain

There is strong evidence for lean muscle gain, but only when creatine is used with resistance training. Creatine allows you to train harder. Harder training builds more muscle. The ISSN position stand says creatine leads to greater increases in lean mass compared to training alone. Some of the early jump on the scale is water stored in muscle, as discussed in the side effects section below.

Recovery between sessions

Recovery support has moderate evidence of benefit . Some studies suggest creatine may aid in muscle recovery between tough sets and workouts and may decrease markers of muscle damage following intense exercise. Results have been mixed among studies so think of recovery as a potential bonus and not a primary reason for taking creatine.

Healthy ageing and sarcopenia

Moderate evidence to support healthy aging. Sarcopenia is an age-related loss of muscle mass and strength. A meta-analysis of 22 trials in 721 older adults found that creatine plus resistance training resulted in about 1.4 kg more lean mass and greater chest and leg strength than training alone. Results for bone health are mixed so creatine should not be considered a bone supplement.

Brain and memory

Brain and memory benefits have emerging evidence. Your brain also needs creatine for energy. Creatine may provide a small boost to memory in adults, but a 2024 meta-analysis found no clear effect on overall cognitive function. Most trials were small and larger studies are needed before firm claims can be made.

Women and menopause

Benefits specific to women have emerging evidence. Women tend to have lower natural creatine stores than men. A review of creatine in women’s health suggests it may support strength, muscle and mood across life stages, including after menopause. Most of this research is early.

Where creatine does not help

Creatine is unlikely to improve long-distance endurance performance such as marathon running or long cycling events. Its strength is brief, repeated efforts.

Creatine Side Effects: What Is Real

Most creatine side effects are mild and predictable. They are listed here from most to least common.

Water weight (most common)

The most frequent side effect of creatine is water retention. 1-2 kg is gained by many people in the first few weeks. Studies have shown that this water is held in muscle cells and not under the skin, so it doesn’t look puffy or bloated.” This early gain is not lard.

Stomach upset

Creatine stomach upset usually happens when you take too much at once, like 10 g all at once. Or if you don’t drink enough water. This is usually avoided by either splitting a loading dose into smaller servings, or skipping loading altogether.

Higher creatinine on blood tests

Creatine can boost levels of creatinine, a waste product doctors test to measure kidney function. Higher readings can mimic a kidney problem when they are not. If you will be having a kidney function test – tell your doctor you take creatine, so the result will be read correctly.

Is Creatine Bad for Your Kidneys?

Creatine does not cause kidney damage in healthy adults when taken at regular doses. The concern is mostly about a blood test that can be misread.

Creatinine is a waste product that your body makes when it breaks down creatine. Doctors estimate kidney function using blood creatinine. When you take creatine, your creatinine level goes up a little, because there is more creatine to break down, not because your kidneys aren’t working. So a creatinine based kidney test can make your kidneys look worse than they are.

And research backs this up. A 2025 meta-analysis of 21 studies found a small, temporary rise in blood creatinine but no significant change in GFR (glomerular filtration rate, the actual rate at which your kidneys filter blood). The authors concluded that the creatinine bump is simply a normal metabolic phenomenon, not kidney damage.

When test results look abnormal, your doctor may order a cystatin C test. Cystatin C is a renal marker that is not derived from muscle creatine and is a reliable alternative to creatinine for estimating renal function.

There is one clear exception. People with existing kidney disease have far less safety data on creatine. If you have any kidney condition, do not start creatine without your doctor’s approval.

Creatine Myths: Hair Loss, Cramps and Dehydration

Most common fears about creatine are not supported by research. Here’s where they came from and what recent studies reveal.

Does creatine cause hair loss?

Concerns about creatine and hair loss date back to a 2009 study of 20 college rugby players. After three weeks of creatine, their DHT (dihydrotestosterone, a hormone associated with male pattern baldness) increased. But hair was never measured in the study.

In 2025, a 12-week randomized controlled trial gave 5 g creatine a day to resistance-trained men and measured hair directly . It found no difference vs placebo in DHT, DHT-to-testosterone ratio, hair density or hair thickness. One caveat is that the trial only involved young men, so we do not know the results in women and older adults.

Cramps, dehydration and muscle damage

Research has not shown creatine to increase the risk of muscle cramping, dehydration or muscle injury. A review of common misconceptions about creatine found that creatine does not cause any of these problems in healthy people. Hydration is important even during hard training, especially in the Indian summer heat. If you take creatine or not, be sure to drink water throughout the day.

Who Should Avoid Creatine or Check With a Doctor

Most healthy adults can take creatine safely. Some groups should speak to a doctor first:

1. People with kidney or liver disease, or anyone on medicines that affect the kidneys, because safety data in these groups is limited.
2. Pregnant or breastfeeding women, because research in pregnancy and breastfeeding is still limited.
3. Anyone under 18. The American Academy of Pediatrics advises teens against creatine and other performance supplements unless a doctor prescribes them for a medical reason.

How to Take Creatine Safely

The safest way to take creatine is a small, steady daily dose of creatine monohydrate with water or a meal.

How much creatine should you take?

According to the ISSN, the standard dose of creatine monohydrate for maintenance is 3–5 g/day. In India, the FSSAI health supplement regulations limit the amount of creatine a supplement can provide per day. That’s why most creatine labels in India say 3 g per scoop. 

Do you need a loading phase?

The loading phase is not a must. Loading is achieved by taking about 20 g daily for 5-7 days, divided into four 5 g doses. It fills your muscles more quickly. A daily intake of 3-5 g will reach the same muscle stores in about 3-4 weeks, with less chance of stomach upset. Most beginners find it easier to skip the loading phase.

Which form of creatine is best?

Creatine monohydrate is the most researched creatine form. Some are more expensive, but none has been shown to work better. Micronized creatine is smaller particles so mixes easier in water. It’s the same molecule as regular creatine monohydrate.

When should you take creatine?

The most important thing with creatine is to be consistent, the timing is not as important. Take it daily, even on your rest days, to keep your muscle stores topped up. Most people find it easiest to take with water, either with food or after exercise.