Supplements for Kids in Competitive Sports: What's Safe, What's Hype, What's Risky

8 min read ·
Bottom Line

For the large majority of young athletes, no supplement comes close to the basics — real food, enough sleep, and consistent training — and the single biggest jump in strength and speed during the teen years comes from puberty itself, not from anything in a tub. The genuine concern is not that products fail to help but that some actively harm: roughly a quarter of tested sports supplements have been found to contain undeclared banned substances, and stimulant pre-workouts and energy drinks are inappropriate for children and adolescents. A short list of things can be justified — correcting a blood-test-confirmed iron or vitamin D deficiency, and for older teens creatine has a reasonable safety record — but these are clinician-guided exceptions, not a default starting point for a young athlete.

Walk into any youth sports facility and the marketing finds you: protein powders shaped like candy, "clean energy" pre-workouts, recovery gummies, and testosterone-adjacent products aimed at boys who want to look like the older kids. Parents understandably want to know what is safe and what actually helps. The honest answer is that for most kids the entire category is a solution in search of a problem — and that the real job is steering them away from the small number of products that can cause harm. This is one area where the pediatric evidence is unusually clear and unusually consistent.

The biggest gains come from puberty and training — not a pill

The American Academy of Pediatrics' clinical report on performance-enhancing substances makes the central point plainly: the physical maturation and hormone production of adolescence are themselves associated with large improvements in strength and athletic performance, and for most young athletes a supplement "does not produce significant gains over those seen with the onset of puberty and adherence to an appropriate nutrition and training program" [1]. In other words, the thing a 14-year-old most wants — to get bigger, faster, and stronger — is already happening on its own, and is best supported by food, sleep, and coaching rather than by a product that promises to accelerate it. A young athlete who feels they "need" a supplement to keep up is usually missing sleep, calories, or training consistency, and those are what to fix first.

Food first — what young athletes actually need

Competitive kids do have higher needs for energy, protein, fluid, and a few minerals, but the overwhelming majority of that is met by eating enough ordinary food. Adequate calories across the day, protein spread across meals, iron-containing foods, calcium and vitamin D for growing bones, and good hydration cover the real physiology. A whey protein shake is not dangerous and can be a convenient way to hit a protein target after practice, but it is food in powder form, not a performance drug — and a turkey sandwich and a glass of milk do the same job. The framing that matters for a young athlete is "are you eating and sleeping enough to support your training," not "which supplement are you missing."

The real risks: contamination and stimulants

Two genuine hazards deserve emphasis. The first is contamination. Because dietary supplements are loosely regulated, products routinely contain things not on the label: one review of 3,132 analyzed supplements found that more than 28% contained undeclared substances, most commonly the banned weight-loss drug sibutramine and anabolic-androgenic steroids [2]. For a young athlete subject to drug testing, that is a positive test and a suspension waiting to happen; for any child it means swallowing an unknown pharmacological agent. The AAP report specifically flags this contamination risk, along with the finding that early use of legal performance products correlates with later use of anabolic steroids [1]. The second hazard is stimulants: caffeine-loaded pre-workouts and energy drinks are widely marketed to teens but are not appropriate for them, and high-dose caffeine in a still-developing cardiovascular and nervous system is a real concern, not a theoretical one. Even in elite adult sport, expert reviews conclude that only a handful of performance supplements have a strong enough evidence base to consider, and that the contamination risk is a serious mark against casual use [3].

What about creatine for teenagers?

Creatine is the one performance supplement with a genuinely interesting safety record in this age group, so it deserves a straight answer rather than reflexive alarm. A 2021 review in Nutrients summarizing the studies of creatine in adolescent athletes found that the available trials generally report performance benefits with no adverse events, though the authors are careful to note the evidence base in minors is still limited compared with adults [4]. Creatine use is also already common in this population — national survey data put creatine use among young people in the single-digit percentages and rising alongside protein use [5]. None of that makes creatine a default for a 13-year-old. The reasonable position is that for an older, post-pubertal teen in a serious training program, creatine monohydrate is among the least concerning options and is not the thing to panic about — but it should involve a parent and ideally a clinician or sports dietitian, use a third-party-tested product (look for NSF Certified for Sport or Informed Sport), and never be a substitute for the food-and-sleep foundation.

The short list of legitimate cases

Strip away the marketing and only a few scenarios justify a supplement in a young athlete, and all of them are about correcting a measured deficiency rather than chasing performance. Iron deficiency is genuinely common in adolescents — especially menstruating girls and endurance athletes — and can quietly sap performance and energy; it should be confirmed with a ferritin blood test and treated under medical guidance, not guessed at. Vitamin D deficiency is also common in kids who train indoors or live at higher latitudes, and is worth checking and correcting. A basic multivitamin is reasonable insurance for a picky eater. Beyond that short, test-driven list, the default answer for a young athlete is the same one elite sports dietitians give: dial in the food, the fluids, the sleep, and the training, and treat the supplement aisle as mostly noise.

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Sources

  1. LaBotz M, Griesemer BA; AAP Council on Sports Medicine and Fitness. "Use of Performance-Enhancing Substances." Pediatrics, 2016;138(1):e20161300. PMID 27354458.
  2. Kozhuharov VR, Ivanov K, Ivanova S. "Dietary Supplements as Source of Unintentional Doping." BioMed Research International, 2022;2022:8387271. PMID 35496041.
  3. Peeling P, Castell LM, Derave W, et al. "Sports Foods and Dietary Supplements for Optimal Function and Performance Enhancement in Track-and-Field Athletes." International Journal of Sport Nutrition and Exercise Metabolism, 2019;29(2):198-209. PMID 30299192.
  4. Jagim AR, Kerksick CM. "Creatine Supplementation in Children and Adolescents." Nutrients, 2021;13(2):664. PMID 33670822.
  5. Ganson KT, Nagata JM. "Prevalence and correlates of appearance- and performance-enhancing drugs and substances use among a national sample of college students aged 18-30." Journal of American College Health, 2022;72(5):1336-1340. PMID 35623043.