IOC-Recognized Supplements for Endurance Athletes: What the Evidence Actually Supports

When athletes ask which supplements are actually worth taking, the most credible answer comes from the International Olympic Committee. In 2018, the IOC assembled a panel of 25 experts and published a consensus statement in the British Journal of Sports Medicine identifying the supplements with the strongest evidence for performance benefit (Maughan et al., BJSM 52(7):439-455, 2018).

The list is short. Of the hundreds of supplements marketed to endurance athletes, the IOC panel found compelling evidence for exactly five: creatine, caffeine, beta-alanine, sodium bicarbonate, and dietary nitrate. Beetroot-derived nitrate is one of them.

This article explains what each of the five does, who benefits most from each, and how they fit into a practical endurance training and racing protocol.

Why the IOC List Matters

The supplement market for endurance athletes generates billions of dollars annually. The vast majority of products on that market have no independent clinical evidence supporting the claims on their labels.

The IOC consensus statement is useful precisely because it applies a consistent evidentiary standard. To make the list, a supplement had to demonstrate performance benefit in well-designed human studies at dosages an athlete could realistically consume. The panel excluded supplements where the evidence was limited to animal studies, highly trained athletes only (with no evidence generalizing to broader populations), or studies with methodological problems.

The result is a framework that allows athletes to prioritize their supplement budget around what actually works. It does not mean the five supplements are appropriate for every athlete in every context. But it does mean each one has cleared the bar that most products never reach.

The Five IOC-Recognized Supplements

1. Creatine

Creatine monohydrate is the most studied supplement in sports science. It increases phosphocreatine stores in muscle, which accelerates ATP resynthesis during high-intensity, short-duration efforts (typically 6 to 60 seconds).

For endurance athletes, creatine is most useful in events or training phases that include repeated short sprints, hill attacks, or time trial finishes. Marathon runners and long-distance cyclists who never sprint have less to gain from creatine than criterium riders or middle-distance runners.

The standard loading protocol is 20 grams per day divided into 4 doses for 5 to 7 days, followed by a maintenance dose of 3 to 5 grams per day. A slower loading approach (3 to 5 grams per day for 28 days) produces the same saturation with less GI distress and is preferred by most athletes.

Creatine supplementation consistently adds 1 to 3 kg of body mass (primarily water retained in muscle), which matters for weight-class sports and events where power-to-weight ratio determines performance on climbs.

2. Caffeine

Caffeine is the most widely consumed performance supplement in the world, and the IOC consensus confirms it works. Caffeine reduces perceived effort, delays fatigue, and improves sustained endurance performance at doses of 3 to 6 mg per kilogram of body weight.

For a 70 kg athlete, that is 210 to 420 mg, roughly equivalent to 2 to 4 cups of strong coffee. Higher doses (above 6 mg per kg) provide little additional benefit and substantially increase GI distress, anxiety, and sleep disruption.

Caffeine is most effective when consumed 30 to 60 minutes before exercise. Habitual caffeine users develop tolerance, which slightly reduces the acute performance effect. A 3 to 5 day caffeine abstinence period before a key race can restore full sensitivity, though this approach produces a withdrawal headache phase that must be timed carefully.

3. Beta-Alanine

Beta-alanine is the precursor to carnosine, a dipeptide stored in muscle tissue that buffers hydrogen ions produced during high-intensity anaerobic work. More carnosine means more buffering capacity, which translates to delayed onset of the burning sensation associated with lactic acid accumulation.

The performance benefit of beta-alanine is most clear in efforts lasting 1 to 4 minutes, which puts it squarely in the range of 400-meter to mile running, pursuit cycling, and the final sprint of a longer endurance race.

Beta-alanine requires chronic loading over 4 to 6 weeks to significantly elevate muscle carnosine. A typical loading dose is 3.2 to 6.4 grams per day divided into smaller doses to manage the harmless tingling sensation (paresthesia) that characterizes beta-alanine supplementation.

4. Sodium Bicarbonate

Sodium bicarbonate (baking soda) is the systemic version of the muscle carnosine buffer. It acts in the bloodstream rather than in the muscle cell, increasing the pH of the blood and facilitating faster clearance of hydrogen ions from working muscle.

The performance evidence for sodium bicarbonate is strongest in events of 1 to 7 minutes at high intensity: 800-meter running, 4-kilometer cycling pursuits, and 1500-meter events. Endurance athletes doing longer efforts see less benefit from bicarbonate because aerobic metabolism dominates above 20 to 30 minutes.

The standard protocol is 0.2 to 0.3 grams per kilogram body weight, taken 60 to 90 minutes before competition with a carbohydrate-containing meal to reduce the significant GI distress that many athletes experience with sodium bicarbonate alone. Small-dose protocols spread over 2 to 3 hours may improve GI tolerance.

5. Dietary Nitrate (Beetroot)

Dietary nitrate is the only supplement on the IOC list that works primarily through an aerobic, oxygen-dependent mechanism. Nitrate is converted in the body to nitrite and then to nitric oxide, which relaxes the smooth muscle lining blood vessels, increasing vasodilation and blood flow to working muscle.

The result is improved oxygen delivery and a measurable reduction in the oxygen cost of sub-maximal aerobic work. Studies consistently show a 3 to 7 percent reduction in the oxygen cost of cycling and running at intensities below VO2max, which translates to faster times or higher sustainable power at the same perceived effort.

Dietary nitrate is unique among the five IOC supplements in that it benefits primarily sub-maximal aerobic performance rather than the anaerobic or glycolytic pathways targeted by creatine, bicarbonate, and beta-alanine. This makes it the most relevant supplement for long-distance endurance events where aerobic economy determines the outcome.

The clinically effective dose is 300 to 600 mg of dietary nitrate per serving, delivered 2 to 3 hours before competition. A 3-day loading protocol (one serving morning and evening) maximizes nitrate saturation in muscle tissue.

See the full loading protocol guide for exact timing and dosing across race distances.

How the Five Supplements Work Together

The IOC panel notes that the five supplements are not mutually exclusive. Several are commonly combined:

Nitrate plus caffeine: The two mechanisms are independent (vasodilation vs. CNS stimulation). Most endurance athletes can use both simultaneously. Practical timing: caffeine 30 to 45 minutes before, dietary nitrate 60 to 90 minutes before.

Creatine plus beta-alanine: Both require chronic loading and are commonly stacked for training blocks that include high-intensity interval sessions. Endurance360® combines both.

Bicarbonate plus nitrate: Some evidence suggests combined use is additive for high-intensity efforts over 4 to 8 minutes. GI management of bicarbonate remains the limiting factor. See the post on beetroot vs. sodium bicarbonate for the full comparison.

Caffeine plus creatine: No known negative interaction. Caffeine does not impair creatine uptake despite earlier concerns in the literature.

What the IOC List Does Not Include

The IOC panel reviewed several other commonly marketed supplements and found insufficient evidence: branched-chain amino acids (BCAAs) for performance (adequate dietary protein provides the same benefit), HMB (beta-hydroxy beta-methylbutyrate), glutamine, ribose, and dozens of herbal extracts including adaptogen blends.

This does not mean these supplements are harmful. Most are simply unproven at the doses available. The IOC's conclusion: if you are prioritizing supplement spending, the five listed above have a clearly better evidence base than anything else on the market.

Compliance Note

All five IOC-recognized supplements are permitted under the WADA Prohibited List. Dietary nitrate, creatine, caffeine (below 12 micrograms per mL in urine, which is far above therapeutic doses), beta-alanine, and sodium bicarbonate are all unrestricted for competitive athletes.

The IOC statement does note that supplement contamination risk is a real concern regardless of a supplement's regulatory status. Athletes competing in tested sports should prioritize products manufactured in certified facilities. Beetroot Pro is manufactured in a cGMP certified facility and ISO 17025 lab tested. The product has not been independently certified by NSF Certified for Sport or Informed Sport. Drug-tested athletes should confirm with their governing body before use.

The Bottom Line

The International Olympic Committee's 2018 consensus statement identifies dietary nitrate (beetroot) as one of five supplements with compelling evidence for endurance performance benefit. It improves oxygen economy at sub-maximal intensities, requires a clinical dose of 300 to 600 mg of dietary nitrate per serving, and delivers peak benefit when taken 60 to 90 minutes before competition with a 3-day loading protocol.

The other four IOC supplements (creatine, caffeine, beta-alanine, sodium bicarbonate) target different physiological pathways and can be combined with dietary nitrate depending on event duration and intensity.

If you are not already using these five supplements systematically, you are leaving evidence-based performance gains on the table.

To compare how different beet supplements stack up on the dose transparency question, see the ingredient comparison guide.

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FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.