Supplements for athletes without doping: what provides an advantage and is compliant with regulations

The WADA Prohibited List for 2026 includes over 250 substances and methods. At the same time, the sports supplement market is flooded with products promising "revolutionary effects" – many of which are either ineffective marketing products or contaminated with prohibited substances that can end an athletic career. The International Society of Sports Nutrition (ISSN) highlights only a few supplements in the "strong evidence" category – those with consistent support in clinical research. This article discusses seven of them: what really works, how to use safely, and how to avoid doping contamination.

KEY INFORMATION
• ISSN (Kreider et al., 2017, J Int Soc Sports Nutr) classifies creatine monohydrate as "the most effective and safest nutritional ergogen available to athletes."
• Caffeine at a dose of 3–6 mg/kg body weight improves endurance, strength, speed, and concentration – it is legal and does not appear on the WADA 2026 List.
• Risk of accidental doping: up to 15% of untested sports supplements contain prohibited substances or their precursors (Geyer et al., 2008, Drug Testing and Analysis).
• Beta-alanine (3.2–6.4 g/d for ≥4 weeks) increases carnosine levels in muscles by 40–80%, delaying fatigue in efforts lasting 1–4 minutes.

How does WADA define doping and how to check if a supplement is safe?

WADA (World Anti-Doping Agency) updates the Prohibited List annually – the 2026 version came into effect on January 1, 2026. The list includes substances prohibited at all times, prohibited only in competition, and prohibited in specific sports. A key issue for athletes: the principle of strict liability – the athlete is responsible for every substance in their sample, regardless of its source, including from supplements.

How to minimize risk? Use supplements with certification for elite athletes: Informed Sport (each batch tested for 250 prohibited substances), NSF Certified for Sport (standard stosowany przez NFL, MLB, NBA), Cologne List (products tested by independent laboratories). Check the status of substances before purchasing at GlobalDRO.com – the official WADA database.

Our observations: Amateur athletes often overlook the risk of contamination in supplements. However, the principle of strict liability also applies to athletes competing in events under the auspices of PZP (Polish Swimming Federation), PZLA (athletics), or other federations affiliated with WADA. One positive test result from a contaminated supplement leads to disqualification. Certification is the only real safeguard.

Creatine – the gold standard of ergogenics

Creatine is the most researched and effective ergogenic supplement in sports. Creatine monohydrate increases phosphocreatine in muscles, accelerating ATP resynthesis during intense efforts. Effects: increased maximum strength and power (meta-analysis: +5–15% in 1RM), increased muscle mass (0.5–2 kg in 4 weeks with strength training), improved endurance in repeated sprints and interval efforts. ISSN Position Stand (Kreider et al., 2017) confirms the effectiveness and safety of creatine monohydrate after over 1000 clinical studies.

Dosage: 5 g of creatine monohydrate daily, without a loading phase (loading increases gains by 7 days but does not change the final effect). Best taken post-workout with carbohydrates (insulin improves creatine transport to muscles). Creatine also affects the brain – it improves short-term memory and reduces cognitive fatigue when sleep-deprived. Effects are seen even in vegetarians and vegans (lower baseline phosphocreatine levels, greater response). Absolutely legal – it does not appear on the WADA List and has never appeared.

Beta-alanine – acidity buffer for high-intensity sports

Beta-alanine works through a buffering mechanism – as a precursor to carnosine, it increases the buffering capacity of muscles for protons (H+) produced during anaerobic glycolysis. This directly translates to delaying metabolic acidosis and fatigue in intense efforts lasting 1–4 minutes. Metaanaliza Hobson et al. (Amino Acids, 2012) A review of 15 studies showed a significant improvement in performance in tasks lasting 1–4 minutes with beta-alanine supplementation.

Dosage: 3.2–6.4 g/day, divided into smaller portions (1.6 g, 4x/day), for a minimum of 4–6 weeks – effects result from the accumulation of carnosine in the muscles and are visible only after a few weeks. Side effect: paresthesia (tingling of the skin, especially on the face and hands) – harmless, resulting from the activation of MAS-related GPCRs; it can be reduced by using slow-release formulations. Beta-alanine is particularly effective in swimming, cycling, rowing, and running distances of 400–1500 m.

Kofeina – legalny i skuteczny ergogen

Caffeine is one of the best-documented ergogenic aids in the history of sports science. It blocks adenosine receptors (A1 and A2A) in the brain, reducing the perception of effort and fatigue. It also activates the central nervous system, improving concentration, reaction time, and mental endurance. Ergogenic effects have been documented in endurance, strength, team sports, and precision disciplines. Pozycja ISSN (Guest et al., 2021) confirms the effectiveness and safety of caffeine in sports.

Dosage: 3–6 mg/kg body weight, 30–60 minutes before exercise. For 70 kg: 210–420 mg of caffeine (2–4 espressos or 1–2 caffeine tablets). Doses above 9 mg/kg do not provide additional effects and increase the risk of tachycardia, tremors, and gastrointestinal issues. Tolerance increases with daily use – consider using caffeine only for training sessions and competitions, with a break of 2–3 days/week. WADA removed caffeine from the banned list in 2004, but still monitors concentrations above 12 µg/ml in urine.

BCAA and protein – amino acids for recovery and anabolism

BCAA (leucine, isoleucine, valine) are unique among amino acids – they are metabolized directly in the muscles, not in the liver, and serve a dual role: as an energy substrate and an anabolic signal. Leucine activates the mTORC1 pathway (mechanistic Target of Rapamycin Complex 1), crucial for muscle protein synthesis. Wolfe (Journal of the ISSN, 2017) emphasizes that leucine as an anabolic trigger requires an appropriate "background" of essential amino acids – which is why complete protein (whey, hemp, egg) is more effective than BCAA supplementation alone.

BCAA dosage: 5–10 g in a 2:1:1 ratio (leucine:isoleucine:valine), 15–30 minutes before or after training, or during long sessions (over 90 minutes). General protein: 1.6–2.2 g/kg body weight/day for high-intensity strength or endurance training. Hemp protein contains all essential amino acids, including BCAA, and is a natural choice for athletes on a plant-based diet or looking to diversify protein sources.

Vitamin D and magnesium – key micronutrients for athletes

Vitamin D influences muscle protein synthesis, androgen receptor expression in muscles, proprioception, and immune system functions. A deficiency of D3 (below 30 ng/ml, common in countries with low sunlight) correlates with reduced muscle strength, higher risk of muscle injuries, and stress fractures. Review by Farrokhyar et al. (Clinical Journal of Sport Medicine, 2015) showed that 56% of elite athletes have a deficiency or insufficient level of D3 before the winter season. Recommendation: 2000–4000 IU/day year-round for athletes in Poland.

Magnesium is involved in over 300 enzymatic processes, including ATP production, protein synthesis, and neuromuscular transmission. Intense training increases magnesium loss through sweat (about 36 mg/hour during intense training) and urine. A deficiency correlates with muscle cramps, poor sleep, and reduced performance. Dosage for athletes: 400–500 mg/day of elemental magnesium from glycinate or citrate, in the evening for recovery effects.

Omega-3 – recovery and anabolism for athletes

Omega-3 EPA and DHA modulate muscle protein metabolism regardless of training. Research by Smith et al. (2011, American Journal of Clinical Nutrition) showed that 4 g/day of omega-3 for 8 weeks significantly increased the rate of muscle protein synthesis in older adults, partly through the activation of the mTOR pathway. In athletes, omega-3 reduces post-exercise inflammation (DOMS – delayed onset muscle soreness) and supports recovery. Dosage: 2–4 g EPA+DHA/day, with a meal containing fats, year-round.

Omega-3 are particularly important for contact and strength athletes – they also protect nerve tissue (myelination) and support cognitive functions that are significant in technical sports. Vegetarians and vegans should choose DHA from algae (Schizochytrium, Ulkenia) – the only plant source of long-chain omega-3 with documented bioavailability comparable to fish.

What supplements should elite athletes avoid?

IGF-1, growth hormones (GH) and their peptides (CJC-1295, ipamorelin, GHRP-6) – banned by WADA under all circumstances, category S2. Found in "hormonal peptides" from the gray area of supplements. DMAA (1,3-dimethylamylamine) – banned by WADA, withdrawn from the EU market, but still found in "pre-workout" products with undisclosed ingredients or from Asian imports. Causes dangerous increases in blood pressure and tachycardia.

Ephedrine and pseudoephedrine – banned in competitions above specified concentrations (ephedrine 10 µg/ml urine, pseudoephedrine 150 µg/ml urine). Found in "energy" or cold products. Anabolic-androgenic steroids (AAS) – always banned. Selective androgen receptor modulators (SARM: ostarine, ligandrol, cardarine) – banned by WADA since 2008, but still sold as "research supplements". Detected in regular anti-doping tests.

It is worth noting that creatine is completely absent from this list – many people mistakenly consider it doping. Creatine is not only not banned, but is actively recommended by ISSN as a safe ergogenic aid. More about creatine in detail in the article. creatine – what it offers, when to take it, and is it only for strength athletes.

How to build an optimal supplementation stack for an athlete?

A good supplementation stack for a competitive athlete should be built layer by layer – from the foundation to specialization. Foundations (supplements useful for anyone actively training): vitamin D3 2000–4000 IU/d throughout the year, magnesium glycinate or citrate 400–500 mg/d, omega-3 1–2 g EPA+DHA/d. These three supplements address common deficiencies among athletes and have a good safety profile without interactions with other preparations.

Ergogenic layer (performance-enhancing supplements): creatine monohydrate 5 g/d for strength and interval sports, beta-alanine 3.2–6.4 g/d for 1–4 minute sports (swimming, rowing, 400–1500 m runs), caffeine 3–6 mg/kg before training or competitions. BCAA 5–10 g for training sessions longer than 90 minutes or with high training volume.

Pre-start protocol: creatine loading (20 g/d for 5–7 days) can be applied 5–7 days before important competitions if the athlete has not previously used creatine. Caffeine 3–6 mg/kg 30–60 minutes before the start. Beta-alanine requires weeks of consistent use – it does not work as a one-time "booster". Electrolytes (sodium, potassium, magnesium) before and during long competitions (over 60 minutes).

Supplements for plant-based and vegan athletes

Athletes on a plant-based diet have a higher risk of deficiencies in several key nutrients. Vitamin B12 – completely absent in a plant-based diet; supplementation of 500–1000 µg/d of methylcobalamin is absolutely necessary. Creatine – absent in plants, which means a lower baseline level of phosphocreatine and a stronger response to supplementation. 5 g of creatine monohydrate/d is particularly recommended for vegan athletes.

DHA z alg (Schizochytrium, Ulkenia) – the only plant source of long-chain omega-3s with bioavailability comparable to fish. EPA from algae is less available, but combined EPA+DHA products from algae are already available. 250–500 mg of DHA/d minimum, 500–1000 mg of DHA+EPA for sports effects. Non-heme iron (from plants) has about 2–10 times lower bioavailability than heme iron (from meat) – vegan athletes should check ferritin every 6 months and supplement iron if ferritin is below 40 µg/l.

Calcium and iodine – with a diet free of dairy and seafood, supplementation of 500–600 mg/day of calcium and 150 µg/day of iodine is often necessary. Zinc from seeds and nuts is less bioavailable than from meat (phytates limit absorption) – soak seeds before consumption or supplement with 10–15 mg/day. Hemp protein is a complete source of amino acids and contains natural BCAAs, magnesium, and iron – a good foundation for vegan supplementation.

Supplements for different sports disciplines – detailed recommendations

Long-distance runners and triathletes – priority on omega-3 (reducing inflammation after long training sessions), vitamin D, and iron (menstruating women with intense training are at high risk of ferritin deficiency). Creatine has limited use in aerobic endurance but improves the quality of interval training. Beta-alanine – for tempo training and races of 1500 m–5 km. Electrolytes (sodium, potassium, magnesium) during efforts lasting over 60–90 minutes.

Swimmers and rowers – beta-alanine is particularly recommended (efforts of 1–4 minutes). Creatine enhances power during speed segments. Caffeine 3–6 mg/kg 30–60 minutes before competitions or heavy sessions. Magnesium – swimmers lose electrolytes through the skin and tend to cramp. Many Polish swimming clubs have included creatine and beta-alanine in their standard supplementation protocols.

Combat sports (wrestling, judo, BJJ, boxing, MMA) – creatine improves explosiveness and anaerobic power, translating to grip strength and blocking. Cortisol is significantly elevated during intense sparring – ashwagandha or phosphatidylserine as recovery support. Special attention to weight reduction (cutting): electrolytes and hydration are critical. Do not use diuretics or 'dehydrators' – dangerous for health and banned by USADA/WADA.

Cycling and road sports – caffeine and nitrates (beet juice, 400–500 ml beetroot juice 2–3 hours before effort) have the strongest evidence for improving performance in cycling. Nitrates convert to nitric oxide, improving mitochondrial efficiency (less oxygen needed for the same work). Beta-alanine and creatine are useful for interval training. Vitamin D, magnesium, and omega-3 – foundational.

Frequently Asked Questions

Which sports supplements are allowed by WADA?

Creatine, beta-alanine, caffeine (up to 12 µg/ml urine), BCAAs, vitamin D, magnesium, omega-3, and plant or whey protein – all legal. Condition: products certified by Informed Sport or NSF Certified for Sport to minimize the risk of contamination with banned substances.

Czy kreatyna jest legalna w sporcie wyczynowym?

Yes, absolutely. Creatine has never appeared on the WADA Prohibited List. The ISSN calls it 'the most effective and safest nutritional ergogenic aid.' 5 g of creatine monohydrate daily is the standard recommended for strength athletes, sprinters, and swimmers.

How does caffeine affect sports performance?

Caffeine blocks adenosine receptors, reducing the perception of effort. Ergogenic dose: 3–6 mg/kg body weight, 30–60 minutes before effort. It improves endurance, strength, reaction time, and concentration. The ISSN Position Stand (Guest et al., 2021) confirms effectiveness in many sports disciplines.

Are BCAAs worth considering for an athlete?

BCAAs stimulate muscle protein synthesis by activating mTORC1 (leucine) and reduce DOMS. Dosage: 5–10 g in a 2:1:1 ratio around training. Complete protein (whey, hemp) is more effective than BCAA supplementation alone, as it also provides the remaining essential amino acids necessary for protein synthesis.

What is beta-alanine and how does it work in sports?

Beta-alanine is a precursor to carnosine, which buffers protons in muscles. Higher levels of carnosine delay metabolic acidosis and fatigue in efforts lasting 1–4 minutes. Dosage: 3.2–6.4 g/day for ≥4 weeks. The meta-analysis by Hobson et al. (2012) showed a significant improvement in performance in high-intensity sports.

Is vitamin D important for athletes?

Yes – vitamin D influences muscle protein synthesis, proprioception, and immunity. Deficiency (below 30 ng/ml) correlates with an increased risk of injuries and stress fractures. Farrokhyar et al. (2015) showed that 56% of elite athletes have a deficiency of D3 before the winter season. Recommendation: 2000–4000 IU/day year-round.

Czy magnez poprawia wyniki sportowe?

Magnesium deficiency (common among athletes due to losses through sweat) correlates with muscle cramps, poor sleep, and reduced performance. Dosage: 400–500 mg/day of elemental magnesium from glycinate or citrate. At normal levels, additional supplementation will not provide an ergogenic effect – it's worth checking magnesium levels in erythrocytes, not in serum.

This article is for informational and educational purposes and does not replace consultation with a doctor. If you are pregnant, breastfeeding, taking medications, or have chronic conditions, consult the use of supplements or herbs with a specialist.

Author: Michał Waluk · Published: 2026-05-04 · Updated: 2026-05-04