Safe Supplements for High School Athletes: Evidenc…

High school athletes are targeted relentlessly by supplement marketing, often featuring impressive-looking products with proprietary blends, dubious claims, and ingredients inappropriate for developing bodies. The truth is that young athletes need very few supplements — and most of the ones they need are basic nutrients rather than performance enhancers. Here is what the evidence actually supports for high school athletes.

The Foundation: Nutrition First

Before any supplement, high school athletes need to understand that food quality and quantity are the primary determinants of their performance and development. Most teenagers — particularly female athletes in aesthetic sports and weight-class sports — are under-fueled. Relative Energy Deficiency in Sport (RED-S) is a serious condition with long-term consequences for bone density, hormonal development, and athletic longevity.

No supplement compensates for chronic energy deficiency. If a high school athlete is restricting calories, the priority is correcting that before adding any supplement.

Omega-3 for Brain Health and Inflammation

Young athletes in contact sports — football, soccer, lacrosse, wrestling — sustain repetitive subconcussive head impacts that may contribute to long-term neurological effects. Omega-3 fatty acids, particularly DHA, are the primary structural fatty acid in brain tissue and have been shown to support neuronal membrane integrity and reduce neuroinflammation.

A 2021 study in Concussion found that pre-injury DHA supplementation was associated with reduced biomarkers of neuronal damage following head impacts. For contact sport athletes, omega-3 supplementation is arguably more important than any performance supplement.

Dose: 1–2g combined EPA+DHA daily with a meal. This is appropriate for all ages and has no significant safety concerns.

Magnesium for Recovery, Sleep, and Muscle Function

Young athletes training 10–20 hours weekly deplete magnesium through sweat and elevated metabolic demand. Magnesium deficiency impairs neuromuscular function, reduces sleep quality, and increases injury risk through its role in muscle relaxation and coordination.

Many high school athletes underperform and recover poorly simply because they are magnesium deficient — a gap that 300mg of magnesium glycinate before bed can largely address within 2–4 weeks.

Dose: 200–300mg magnesium glycinate at night (lower end for smaller athletes, upper end for those with high sweat rates or heavy training volumes).

Vitamin D for Bone Development and Immunity

Adolescence is the critical window for peak bone mineral density accrual — the foundation for skeletal health throughout adulthood. Vitamin D, along with calcium, is essential for this process. Yet studies consistently show that a majority of American teenagers are vitamin D insufficient, particularly those in northern latitudes, those with darker skin, and indoor athletes.

Vitamin D deficiency during adolescent athletic training increases stress fracture risk — a common and season-ending injury in young athletes. It also impairs immune function at a stage when school environments maximize pathogen exposure.

Dose: 1,000–2,000 IU vitamin D3 daily with a fat-containing meal, ideally with K2 (100mcg MK-7).

Protein for Muscle Development

Young athletes have elevated protein requirements — research supports 1.4–2.0g per kg of bodyweight daily for adolescents engaged in strength and power training. Most high school athletes do not hit this target through food alone, particularly those with limited access to quality nutrition.

Whey protein is safe and effective for adolescent athletes. One 20–30g serving post-workout or before sleep meaningfully supports muscle protein synthesis without any health concerns. Protein is a food, not a drug.

Dose: 20–30g of whey or plant-based protein as needed to reach daily targets.

On Creatine for Adolescents

Creatine is safe for adults and has over 500 studies supporting its efficacy. However, most major sports medicine organizations — including the American Academy of Pediatrics — recommend that athletes under 18 avoid creatine supplementation. The primary concern is not demonstrated harm but rather the principle that young athletes should exhaust nutritional and training optimization before adding ergogenic aids.

For high school athletes, the performance gains that creatine would provide can be largely achieved through optimized training, nutrition, sleep, and the foundational supplements above. Creatine use can be revisited at 18+.

What to Avoid

High school athletes should avoid: pre-workouts containing stimulants (ephedra, DMAA, synephrine), hormonal products (testosterone boosters, DHEA), any products with proprietary blends that obscure actual ingredient doses, and anything that makes dramatic performance claims without published clinical evidence.

FAQ

Q: Can high school athletes take protein shakes every day?

Yes. Protein is a macronutrient, not a drug. High-quality protein shakes are no different nutritionally from eating chicken breast. The key is not over-relying on supplements at the expense of whole food nutrition.

Q: Are sports drinks the same as electrolyte supplements?

Sports drinks provide sodium, carbohydrates, and potassium — helpful for sessions over 60 minutes in heat. They are not the same as targeted magnesium supplementation. For most practices and games, water plus adequate dietary electrolytes is sufficient.

Q: My coach recommends pre-workouts. Is that okay?

Many pre-workouts are inappropriate for teenagers due to high stimulant doses. An alternative: 100mg caffeine (equivalent to a cup of coffee) + 200mg L-theanine is safer and more effective than most commercial pre-workouts, with a predictable and controllable dose.

Q: When should I start thinking about more advanced supplements?

After age 18, once training age is established (2+ years of consistent training), and after nutritional fundamentals (calories, protein, sleep) are consistently optimized. Advanced supplements have diminishing returns when fundamentals are not in place.

Track your supplements in Optimize.

Safe Supplements for High School Athletes: Evidence-Based Basics