Creatine is generally considered safe for high school athletes when used properly. It is one of the most studied sports supplements in existence, and research on children and adolescents, including clinical trials using doses of 3 to 5 grams per day for months at a time, has not identified serious adverse effects. That said, the context matters: age, dosage, training level, and product quality all factor into whether it makes sense for a teenager.
What Creatine Actually Does
Creatine is a naturally occurring compound your body makes from amino acids, and you also get it from meat and fish. Your muscles store it and use it to regenerate energy during short, intense efforts like sprinting, jumping, and lifting. Supplementing with creatine monohydrate increases those muscle stores, which can improve power output and recovery between bouts of high-intensity exercise.
Your body already produces about 1 to 2 grams of creatine per day, and a typical diet that includes meat provides another 1 to 2 grams. Supplementation simply tops off what’s already there. This is part of why the safety profile is so strong: you’re not introducing a foreign substance but increasing levels of something your cells already depend on.
How Common Is Use Among High Schoolers
Creatine use rises sharply through the high school years. In one survey of over 1,100 young athletes published in Pediatrics, 5.6% reported using creatine overall, but 44% of twelfth-graders said they had used it. Boys were far more likely to take it than girls: 8.8% of male athletes compared to 1.8% of female athletes. These numbers suggest many teens are already making this decision on their own, often without guidance on dosing or product selection.
What the Research Shows in Young People
Most creatine research has been done on adults, but a meaningful body of evidence does exist in children and adolescents. Multiple clinical trials have given young people doses of 3 to 5 grams per day for weeks to months without reporting harmful effects. Much of this research comes from medical settings, where creatine has been used therapeutically in children with muscular dystrophy and rare metabolic conditions affecting brain creatine levels.
In muscular dystrophy trials, boys as young as six years old received 5 grams per day of creatine for extended periods. Researchers in these studies monitored kidney function, liver markers, and overall health and did not flag safety concerns at those doses. Separately, a study examining brain and muscle creatine levels across age groups, including children, found that a standard loading protocol (about 0.3 grams per kilogram of body weight per day for seven days) effectively increased creatine stores without adverse events.
What’s missing is large-scale, long-term data specifically on healthy teenage athletes. The existing evidence is reassuring, but it comes largely from clinical populations and relatively small sample sizes. This gap is the main reason some organizations urge caution rather than blanket endorsement.
The ISSN’s Criteria for Younger Athletes
The International Society of Sports Nutrition, one of the most respected bodies in sports supplementation, does not ban creatine for teens. Instead, it recommends that younger athletes only use creatine if they meet four conditions:
- Serious, supervised training. The athlete is involved in competitive, coached training, not casual recreational activity.
- A well-balanced diet. Creatine should supplement a solid nutritional foundation, not replace one.
- Knowledge of proper use. The athlete (and ideally a parent or coach) understands what creatine does and how to take it.
- Appropriate dosages. The athlete does not exceed recommended amounts.
If a high school athlete checks all four boxes, the ISSN considers creatine a reasonable option. If a teenager can’t explain what creatine is or isn’t eating well in the first place, supplementation is premature.
Dosing for High School Athletes
There are two common approaches. The faster method uses a loading phase of roughly 0.3 grams per kilogram of body weight per day for five to seven days, then drops to a maintenance dose of 3 to 5 grams per day. For a 150-pound teenager, the loading dose would be about 20 grams per day, split into four servings.
The simpler approach skips loading entirely and starts at 3 to 5 grams per day from day one. This takes three to four weeks to fully saturate muscle stores rather than one week, but it avoids the bloating and stomach discomfort that some people experience during a loading phase. For most high school athletes, the slower approach is perfectly practical since there’s rarely a reason to rush the process.
Common Concerns: Growth, Kidneys, and Dehydration
Parents often worry that creatine could interfere with growth plates or hormone development. No published research supports this concern. Creatine does not affect testosterone, growth hormone, or other hormones involved in puberty. It is not an anabolic steroid and does not act on the same pathways.
The idea that creatine damages kidneys persists but lacks evidence in healthy individuals. Creatine is broken down into creatinine, which the kidneys filter out. Higher creatinine levels on a blood test can look alarming, but in someone taking creatine, an elevated reading simply reflects increased creatine turnover, not kidney damage. That said, anyone with a pre-existing kidney condition should avoid creatine or use it only under medical supervision.
Dehydration and cramping are frequently cited risks, but controlled studies have not confirmed a causal link. Creatine does pull water into muscle cells, which increases total body water. This is sometimes misinterpreted as dehydration, but in practice, athletes who drink adequate fluids don’t appear to cramp more often when taking creatine. Staying well-hydrated is still important, especially during two-a-day practices or summer training.
A Possible Role in Concussion Protection
One of the more interesting areas of creatine research involves brain health. Your brain uses a significant amount of creatine for energy metabolism, and concussions disrupt that process. After a mild traumatic brain injury, creatine levels in the brain drop, contributing to the energy crisis that slows recovery.
Animal studies have shown that creatine supplementation before an injury reduces tissue damage and lowers the buildup of harmful metabolic byproducts. In studies involving contact sport athletes, creatine was included in nutritional recovery protocols, and researchers observed improvements in markers of brain energy metabolism. The evidence is still early, but for high school athletes in collision sports like football, hockey, and soccer, the potential brain-protective benefits add another dimension to the conversation.
Choosing a Product
Supplements are not regulated the same way as prescription drugs, which means what’s on the label doesn’t always match what’s in the container. Independent testing has found that some supplements contain undeclared ingredients, including banned substances that could cause a positive drug test or genuine health risks.
Stick with creatine monohydrate. It is the most researched form and typically the least expensive. Avoid products labeled as proprietary blends, since these obscure the actual amounts of each ingredient. Look for a third-party certification like NSF Certified for Sport or Informed Choice on the label. These programs test for banned substances, contaminants, and label accuracy. For a high school athlete, this step is not optional: a clean, verified product eliminates the biggest real-world risk of supplementation.