What Is Creatine?

Creatine is a natural substance found in meat and fish, and your body also makes it on its own. It helps your muscles produce energy during short bursts of intense activity — like lifting weights, sprinting, or jumping.

Creatine monohydrate is the form that is recommended if a supplement is going to be taken.  Other forms (ethyl ester, hydrochloride, buffered) have no evidence of superiority and less safety data.  Creatine monohydrate is one of the most studied supplements in the world showing safety and effectiveness, some studies including teens.

Creatine is NOT a steroid. It is not a hormone. It does not work like steroids do.

What Does Creatine Actually Do?

Creatine is one of the most studied supplements available. Your body makes some on its own, and you also get it from meat and fish. Taking extra as a supplement (usually 3–5 grams a day of "creatine monohydrate") builds up your body's energy reserves. Here's what the science actually shows it can and can't do.

Muscle and Strength — Strongest, Most Proven Benefit

• Well-established outcomes: increased strength, power, lean body mass and high-intensity exercise performance when combined with resistance training. Improves performance during short, high-intensity exercise.
• May help with recovery after exercise or injury.
• For women after menopause, creatine (at least 5 g/day) combined with resistance training can help preserve lean muscle mass and strength during a time when both naturally decline.
• You may gain 1–3 pounds of water weight — this is normal and is not fat.
• Requires exercise to translate into meaningful gains — creatine alone does little for muscle.
• Effects appear within days to weeks of consistent daily dosing.
• Works for a wide range of people, including older adults trying to preserve muscle and strength as they age.
  

Brain and Thinking — Promising but Smaller Effects

Creatine reaches the brain less easily than muscle, so effects are more modest and depend on the situation.

• Most helpful for older adults, vegetarians (who start with lower stores), and times of stress on the brain.
• May improve short-term memory and reasoning, especially in people over 65.
• Healthy, well-rested young people usually notice little to no benefit.
• Doses of at least 10g are required for brain benefits.

Sleep Deprivation

• When you're sleep-deprived, creatine may help protect thinking speed, reaction time, and mood.
• It is a helper, not a substitute for real sleep.
• High doses are needed. Single high-dose (0.35 g/kg, which is about 25g for a 70 kg /155 pound adult) or 5 g four times daily for 7 days have shown positive benefits in studies.

Depression and Mood — Emerging Use

• May add a modest benefit when used alongside standard treatment (antidepressants or therapy) — not as a replacement.
• The size of the benefit is uncertain and may be small. It did not help depressed teenage girls in studies.
• Talk to your doctor first, especially if you have bipolar disorder, since a few people have experienced mood elevation (mania).
• Doses studied range from 2–10 g/day for 4–8 weeks.

Aging, Frailty, and Muscle Loss — Helpful With Exercise

• Can help older adults, including postmenopausal women, gain small but meaningful amounts of muscle and strength when combined with strength training.

Things Creatine Has NOT Been Shown to Do

• Does not strengthen bones or prevent fractures (studies found no effect on bone density).
• Does not improve heart function or survival in heart disease.
• Does not reliably reduce inflammation.
• No proven benefit for preventing or treating concussions in humans (still being studied and animal studies are promising).
• Cancer and immune-system effects are only seen in lab/animal studies — not proven in people.
  
• It does not help with endurance activities like long-distance running, swimming, or cycling.
• It does not cause hair loss (this is a myth — no study has shown this).
• It does not cause kidney damage - studies of healthy individuals lasting up to 5 years show no kidney harm at recommended doses. Anyone with pre-existing kidney disease should consult their doctor first.
• It does not cause dehydration or muscle cramps when used properly.
• It is not effective to build muscle without exercise — taking creatine alone without training does very little.

Safe Use Guidelines

Look for quality products

Since supplements are not regulated like medications, quality can vary widely. Look for products that carry one of these third-party testing seals:

• NSF Certified for Sport
• Informed Sport
• USP Verified

These seals mean the product has been independently tested to confirm it contains what the label says, and nothing harmful has been added.

type of supplement and dosing

• Creatine monohydrate powder dissolved in liquid is the best-supported delivery form.
• Avoid other forms — gummy, capsule, buffered, hydrochloride, or other forms tend to cost significantly more, are less well absorbed, and may contain added sugar that is not recommended.
• Take 3–5 grams per day for muscle benefits (higher for other concerns, see above).
• No loading phase is needed. While some companies recommend this, your body can only take in so much creatine and excess may simply lead to higher cost.
• Take it consistently — it takes about 4 weeks of daily use to fully load your muscles.
• You can take it at any time of day, with or without food.
  

Use By Age and Life Factors for muscle benefits

For Teens (Ages 13–18)

There is disagreement between the International Society of Sports Nutrition (ISSN) and the American Academy of Pediatrics (AAP) as to whether or not creatine should be recommended for use in adolescents.

Why this disagreement? Creatine has been used safely in young people in medical settings for management of brain injury and concussions, muscular dystrophy, and metabolic conditions that impair the metabolism of creatine, but it has not been specifically studied in healthy teen athletes. Because of this, the AAP does not recommend creatine use in children or teens. Their consensus statement linked above acknowledges that creatine use rises sharply between 9th and 12th grade, with 25–40% of teens using it. The ISSN expert panel consensus statement states that creatine is safe for children and adolescents.

A conservative approach for use with the above in mind if a teen wants to use creatine:

• Teens should focus first on proper nutrition, hydration, sleep, and a structured training program. Creatine is a supplement — not a substitute for the basics. If they are not willing or able to eat a well-balanced diet, get adequate sleep for age, or do regular strength-building exercises, the creatine is not going to work as well.
• Use only creatine monohydrate, preferably in powder form mixed with liquid.
• Purchase product with a 3rd party testing seal.
• Dose at 3–5 g per day, approximately 0.1 g per kg of body weight per day.
• Avoid a "loading phase" (higher doses for the first week) because it offers  limited short term benefit and may lead to more side effects.
• Consistent daily use at 3–5 g will fully saturate muscles within about 3–4 weeks. Any time of day to take creatine is appropriate.

Adults

This is the best-studied group. Creatine helps build lean muscle mass (about 1–1.5 kg more than training alone in men with smaller gains in women). The recommended teen approach holds true for adults as well.

Pregnancy

Animal studies suggest creatine may protect the developing baby's brain during complications, and the uterus naturally makes and uses creatine. However, there are no human studies yet proving it is safe or effective during pregnancy.

It is not recommended during pregnancy at this time due to lack of human safety evidence.

Perimenopause (the transition to menopause)

This stage has almost no research on creatine. Since muscle and bone loss speed up during this time, creatine with resistance training makes sense in theory, but studies are needed.

After Menopause

Research shows creatine at 5 grams or more per day combined with resistance training can improve lean muscle mass and leg strength in postmenopausal women. Lower doses (3 grams or less) without exercise did not show benefit, so women in this age group should take at least 5 grams per day. Some experts recommend a slightly higher dose of about 0.3 g per kilogram of body weight for postmenopausal women.

Who Should Talk to Their Doctor First

 

• Anyone with kidney disease or at risk for kidney problems.
• Individuals taking medications that affect kidney function.
• Pregnant or breastfeeding women (limited data - discuss with your provider).

Key Takeaways

• Creatine monohydrate is one of the most researched and safest supplements available.
• It works best for strength, power, and high-intensity activities — not endurance sports.
• Other benefits for our brain, bones, and mood have varying levels of evidence.
• It does not damage kidneys in healthy people, is not a steroid, and does not cause hair loss.
• For the best muscle-building results, combine it with regular resistance training and good nutrition.
• Always choose a reputable, third-party tested product.