Creatine has not been proven unsafe for 13-year-olds, but it also hasn’t been proven safe. The honest answer is that almost no clinical research has specifically studied creatine supplementation in young teenagers. Most of what we know about creatine’s safety and effectiveness comes from adult studies, and the few pediatric studies that exist were conducted on children with medical conditions under direct supervision. That leaves parents in a gray area, which is exactly why this question gets searched so often.
Why the Research Gap Matters
Creatine monohydrate is one of the most studied sports supplements in the world, with over 26,000 participants across hundreds of randomized controlled trials. The problem is that the vast majority of those participants were adults. A 2023 literature review published in the Journal of Orthopaedic Science and Practice put it plainly: there is a significant gap in studying the safety and efficacy of creatine in adolescents, and high-quality research on pre-adult populations is still needed.
Concerns about serious acute side effects in healthy people have largely been put to rest by adult data. But the long-term effects of supplementing during a period of active physiological change, when hormones are shifting, bones are still growing, and the brain is developing rapidly, remain unknown. No study has tracked what happens when a 13-year-old takes creatine through puberty and into adulthood.
What Adult Studies Actually Show
In adults, creatine produces a modest 3 to 5 percent increase in performance, primarily in short, explosive activities like sprinting, weightlifting, and jumping. Not all users see this benefit. Creatine works by helping your muscles regenerate their primary energy source faster during intense effort. It doesn’t build muscle on its own; it lets you train slightly harder, which can lead to gains over time.
Whether these same performance effects translate to a 13-year-old’s body is genuinely unclear. A teenager’s muscle composition, hormonal environment, and training response differ from an adult’s, and no controlled study has measured performance outcomes specifically in middle schoolers.
Side Effects: What the Evidence Says
The most commonly reported side effects of creatine are digestive issues: bloating, stomach discomfort, and diarrhea. These tend to happen when someone takes a large single dose (more than 10 grams at once), because unabsorbed creatine draws water into the intestine. A major review of 685 controlled trials found that digestive complaints occurred at nearly the same rate in people taking creatine (5.5%) as in those taking a placebo (4.2%), a difference that wasn’t statistically significant.
The old concerns about creatine causing dehydration, muscle cramps, or heat illness have not held up. Controlled studies show no meaningful effect on hydration or the body’s ability to regulate temperature. Some evidence actually suggests creatine may reduce the incidence of muscle cramps during exercise. There is also no established link between creatine and kidney damage in people with healthy kidneys, though again, this has been studied primarily in adults.
The Brain Development Question
One area generating interest is creatine’s role in brain function. The brain uses creatine as an energy source, and early research in adults suggests supplementation may have a protective effect on brain function during stressful situations, including after traumatic brain injury. At least one clinical trial has used creatine in children and adolescents recovering from brain injuries at doses of 0.4 grams per kilogram of body weight daily for six months. A formal study protocol has been designed to test whether creatine improves cognitive performance in adolescents, calling it a “low-risk intervention,” but results from rigorous trials in this age group are still limited.
This is worth knowing because it shifts the conversation beyond just muscle and sports. But it also underscores the same theme: promising signals exist, yet the research in teenagers is thin.
How Common Is Teen Creatine Use?
Your 13-year-old wouldn’t be alone if they wanted to try creatine. Among middle school and high school athletes, an estimated 24 to 29 percent use some type of performance-enhancing supplement. Studies focused specifically on creatine find that 5 to 20 percent of high school athletes have used it, with higher rates among males and in sports like football, hockey, and basketball. One high school survey found 9 percent of male athletes and 2 percent of female athletes reported creatine use. Data on middle schoolers specifically is harder to find, but supplement use clearly starts before high school for many young athletes.
What Major Medical Groups Recommend
Most sports medicine organizations and children’s hospitals do not recommend creatine for athletes under 18, primarily because of the lack of adolescent-specific safety data rather than because of documented harm. The American Medical Society for Sports Medicine and the American Academy of Pediatrics have both expressed caution. Arnold Palmer Hospital for Children notes that the performance studies were conducted in adults and that “there is virtually no scientific evidence to assess the safety or effectiveness of creatine in adolescents.”
This doesn’t mean creatine is dangerous for a 13-year-old. It means no one can confidently tell you it’s safe during a critical developmental window, because the studies haven’t been done.
Dosing Used in Existing Studies
When creatine has been used in adolescent or pediatric settings, dosing has generally followed adult protocols. The typical approach is a loading phase of about 0.3 grams per kilogram of body weight per day for five to seven days, followed by a maintenance dose of 3 to 5 grams per day. For a 13-year-old weighing around 50 kilograms (110 pounds), that loading dose would be about 15 grams daily, split into smaller servings. An alternative approach skips the loading phase entirely and uses 3 grams per day for about 28 days to gradually build up stores.
In pediatric medical studies involving children with neuromuscular or metabolic disorders, higher weight-based doses (0.3 to 0.8 grams per kilogram per day) have been used under medical supervision without reported kidney, liver, or heart toxicity. These were controlled clinical settings, not general use scenarios, but they do provide some reassurance about short-term tolerability.
The Supplement Purity Problem
One risk that applies to teenagers even more than adults is supplement contamination. The supplement industry is not tightly regulated, and products can contain ingredients not listed on the label, including substances banned by athletic organizations. For a young athlete subject to school or league drug testing, or simply a parent who wants to know what their child is actually ingesting, this matters.
NSF’s Certified for Sport program tests products for 290 banned substances, including stimulants, steroids, narcotics, and masking agents. It also verifies that what’s on the label matches what’s in the product. If a family does decide to allow creatine use, choosing a product with this certification is one concrete way to reduce risk. Products without third-party testing carry no guarantee about their actual contents.
Practical Considerations for Parents
Before creatine enters the picture, the basics matter far more for a 13-year-old’s athletic development. Adequate protein intake from food, consistent sleep, proper hydration, and a well-designed training program will produce substantially larger performance gains than any supplement at this age. A teenager who isn’t eating enough calories or sleeping eight to ten hours a night has far more room for improvement from lifestyle changes than from creatine.
If your teenager is set on trying creatine, keeping the dose at or below 3 to 5 grams per day (skipping the loading phase), choosing a third-party tested creatine monohydrate product, and monitoring for any digestive discomfort is the most conservative approach supported by what limited data exists. Splitting the dose into smaller servings taken with meals can reduce the chance of stomach issues.