Supplements for Endurance Athletes: What Works, What to Skip
Almost every roundup of supplements for endurance athletes hands you a list and a dose. This one also hands you the citation, tells you which runners respond and which do not, and says plainly which popular products to skip.
The honest picture is narrow. The IOC consensus statement found that only a small handful of products have solid supporting evidence, and that even those add only a minor contribution to performance (Maughan, Br J Sports Med, 2018).
The Short Answer: The Best Supplements for Endurance Athletes
- Carbohydrate fueling. The biggest real lever in endurance sport. Grade A.
- Caffeine. The most reliable performance supplement in the literature. Grade A.
- Dietary nitrate from beetroot. Real effects, best in shorter efforts. Grade B.
- Beta-alanine. Helps the 1 to 4 minute window, not the marathon. Grade B.
- Protein and leucine. Supports recovery and adaptation, not the stopwatch. Grade A.
The rest is situational or a skip. Creatine helps the sprint end, tart cherry and collagen sit around hard blocks, and iron and vitamin D matter only if you are short on them. BCAAs and magnesium for cramps do not earn their place.
Fix your fuel first. Carbohydrate, fluid, and sodium move the needle more than everything else on this page combined.
How This Guide Grades Supplements for Endurance Athletes
Strong evidence means human meta-analyses and randomized controlled trials, in trained or active people, with a performance or recovery endpoint. That standard rules out most of what you read.
Every supplement below gets one of four grades:
- Grade A. Consistent human evidence in active people, with a clear performance or recovery outcome.
- Grade B. Real evidence, but the benefit is situational or responder-dependent.
- Grade C. Corrects a genuine shortfall or supports general health, not a direct performance edge.
- Skip. Widely sold, widely believed, and not supported for endurance.
Fuel First: Carbohydrate, Fluid, and Sodium
Supplements are the small edge. Fuel is the big one.
Carbohydrate taken during exercise improves endurance performance, and the effect is largest in time-to-exhaustion tests, in longer events, and in less-trained people (Ramos-Campo, Crit Rev Food Sci Nutr, 2024). It also spares glycogen by a small but significant amount, a standardized mean difference of -0.16 over roughly 100 minutes (Rothschild, J Appl Physiol, 2026).
The targets are well settled:
- 30 to 60 g of carbohydrate per hour for efforts past about 90 minutes (Thomas, Med Sci Sports Exerc, 2016).
- Toward 90 g per hour with multiple transportable carbohydrates, meaning glucose paired with fructose (Thomas, Med Sci Sports Exerc, 2016).
- 30 to 50 g per hour during ultra racing (Tiller, J Int Soc Sports Nutr, 2019).
Fluid and sodium are the other half of fuel. On top of a fueled, hydrated body, the realistic edge from the best supplements on this page is small, a few percent at best (Maughan, Br J Sports Med, 2018).
A perfect caffeine protocol on top of empty glycogen is a rounding error.
Beetroot Juice and Dietary Nitrate
Beetroot concentrates dietary nitrate, which the body converts to nitric oxide, affecting blood flow and the efficiency of muscle contraction.
The tested dose is 300 to 600 mg of nitrate, taken 2 to 3 hours before effort, or loaded daily for 3 to 6 days (Hoon, Int J Sport Nutr Exerc Metab, 2013), which is roughly two concentrated beetroot shots.
The evidence is real but bounded. A 2013 meta-analysis of 17 studies found a significant, moderate benefit for time to exhaustion (effect size 0.79, 95 percent CI 0.23 to 1.35) and a small, non-significant effect for time trials (0.11) (Hoon, 2013). A 2017 meta-analysis of 47 studies found an overall effect that was trivial and non-significant (0.10) but a small-to-moderate time-to-exhaustion effect (0.33) (McMahon, Sports Med, 2017).
In runners specifically, the results get messier: a 1,500 m time trial improved at 12.5 mmol of nitrate, 10,000 m did not, and neither 8.4 mmol per day in recreational 10 km runners nor 19.5 mmol in elite 1,500 m runners helped (Hoon, Int J Sport Nutr Exerc Metab, 2013; McMahon, Sports Med, 2017).
Why Some Runners Respond
Nitrate needs specific oral bacteria to take its first step toward nitric oxide.
- Antibacterial mouthwash and some chewing gums can wipe out the effect by killing those bacteria.
- Concentrated beetroot products are a practical way to keep dietary nitrate in the diet around key sessions.
- The cleaner results are in short efforts, under about 40 minutes, not in long events or elite fields.
Verdict: Grade B. Real, best for shorter races, and dependent on your mouth bacteria and your event.
Beetroot is a short-effort edge, not a marathon cheat code.
Caffeine
Caffeine has the deepest and most consistent evidence of anything on this page.
The effective dose is 3 to 6 mg/kg of body mass, taken 45 to 60 minutes before exercise, and some trials show benefit as low as 2 mg/kg (Southward, Sports Med, 2018; Guest, J Int Soc Sports Nutr, 2021). A 2018 meta-analysis of 46 studies found mean power output improved by about 3.03 percent and time-trial time improved by about 2.22 percent (Southward, 2018).
The Individual Response Problem
- In the same meta-analysis, two studies showed slower performance and five showed lower power output (Southward, 2018).
- Genetics and habitual intake both shape the response, and heavy coffee drinkers can be partly desensitized.
- Some people are genuine non-responders.
The ISSN position stand supports 3 to 6 mg/kg and notes that very high doses, around 9 mg/kg, add side effects without added benefit (Guest, 2021).
Verdict: Grade A. Test your dose in training, never on race day.
Caffeine works for most runners, not all. The only way to learn which group you are in is to try it and watch your splits.
Beta-Alanine
Beta-alanine raises muscle carnosine, a buffer that mops up the acid that builds during hard efforts.
The dose is 4 to 6 g per day, split into servings of 1.6 g or less, for at least 2 to 4 weeks. That raises muscle carnosine by 40 to 60 percent (Trexler, J Int Soc Sports Nutr, 2015).
A 2012 meta-analysis found benefit for exercise lasting 60 to 240 seconds and over 240 seconds, no benefit under 60 seconds, and a median improvement of about 2.85 percent (Hobson, Amino Acids, 2012). That is the 1 to 4 minute window: a finishing kick, an 800 m rep, a sustained climb. It does not help steady-state endurance.
Paresthesia
- The tingling is called paresthesia, from a fast rise of beta-alanine in the blood.
- It is harmless but distracting, and it appears at servings above about 1.6 g (Trexler, 2015).
- Split the dose or use a sustained-release form and it mostly goes away.
Verdict: Grade B. Useful for the sprint end and interval work, not the long grind.
Beta-alanine buys you a better last 90 seconds, not a better last 90 minutes.
Carbohydrate During Exercise
Carbohydrate is the one entry that is not really a supplement. It is fuel, the grade is A, and the effect is largest in long efforts and in less-trained athletes (Ramos-Campo, Crit Rev Food Sci Nutr, 2024). The targets are 30 to 60 g per hour past about 90 minutes, toward 90 g per hour with multiple transportable carbohydrates, and 30 to 50 g per hour during ultra racing (Thomas, Med Sci Sports Exerc, 2016; Tiller, J Int Soc Sports Nutr, 2019).
Verdict: Grade A. No capsule on this page outperforms eating enough carbohydrate during a long event.
Sodium and Electrolytes
Sodium needs are individual, scaling with your sweat rate and the sodium in your sweat rather than the distance. The electrolyte supplements guide covers the label side of that.
The strongest finding is a safety one. In a 161 km ultra, 93.9 percent of finishers used sodium supplements, hyponatremia still occurred in 6.6 percent, and the authors concluded that avoiding overhydration mattered far more than sodium intake (Hoffman, Med Sci Sports Exerc, 2015). The ultra-marathon position stand suggests sodium above 575 mg/L in hot conditions (Tiller, J Int Soc Sports Nutr, 2019).
Verdict: Grade B. More for safety and comfort than for the stopwatch. Match sodium to your sweat losses, and do not out-drink your thirst.
In a long race, the bigger risk is drinking too much, not taking in too little sodium.
Creatine
Creatine is one of the best-supported sports supplements in existence, and for endurance it is close to useless.
For endurance, the grade is C. A 2023 meta-analysis in trained people found creatine monohydrate ineffective for endurance performance, a trivial negative effect of -0.07 (Fernández-Landa, Sports Med, 2023). A separate meta-analysis found a negative effect on VO2 max, a between-group effect size of -0.32 (Gras, Crit Rev Food Sci Nutr, 2023).
It helps the sprint end of training: repeated sprints, hill efforts, and strength work that supports running economy. The dose is 3 to 5 g per day, with no loading needed. Expect 1 to 2 kg of water weight in the first month. Safety is well established up to 30 g per day over the long term (Kreider, J Int Soc Sports Nutr, 2017).
Verdict: Grade C for endurance, Grade A for the sprint end.
Creatine makes you better at the parts of running that end in seconds, not the parts that end in hours.
Tart Cherry
Tart cherry sits in the recovery category only. A 2026 meta-analysis of 19 trials found tart cherry juice improved recovery of maximal voluntary contraction (effect sizes rising from 0.63 immediately to 4.82 at 96 hours) and reduced C-reactive protein (Daab, Sports Med Open, 2026).
It did not reduce soreness: the meta-analysis found no significant pooled effect on soreness, and certainty ranged from very low to moderate (Daab, 2026). So it is a possible aid around a hard block or a race, not a performance enhancer.
Verdict: Grade B, recovery only. For the running-specific picture, including what to do after a long run, see the guide to supplements for muscle recovery after running.
Tart cherry may help your muscle recover on paper. It will not reliably take your soreness away.
Collagen and Vitamin C
Collagen plus vitamin C targets tendons and connective tissue, not the stopwatch.
In 8 men, 15 g of vitamin C-enriched gelatin taken about 1 hour before intermittent activity roughly doubled a marker of collagen synthesis (Shaw, Am J Clin Nutr, 2017). A randomized trial in professional female soccer players then found 30 g of hydrolysed collagen plus 500 mg of vitamin C before sessions, over 10 weeks, increased patellar tendon stiffness by 15.4 percent versus 4.6 percent with placebo, in a small sample of 11 athletes (Lee, Exp Physiol, 2025).
A practical version: 10 to 15 g of collagen plus about 50 mg of vitamin C, taken before load. For connective tissue support more broadly, see Agape's bone, joint and pain collection.
Verdict: Grade B. Promising for runners with a tendon history, not a performance enhancer.
Vitamin D
Vitamin D is a nutrient-gap fix, not an ergogenic aid.
A 2024 meta-analysis of 10 randomized trials in athletes found vitamin D3 raised 25(OH)D but did not significantly improve overall muscle strength, with an effect size of 0.18 (Han, Front Nutr, 2024). If you are short, correcting it helps; if you are adequate, more does not sharpen your running.
The honest rule: test, then correct a shortfall, but do not megadose. Agape's vitamin D3 and K2 guide covers the forms and the dosing.
Verdict: Grade C.
Iron
Iron is the most likely genuine nutrient gap in runners, and the most dangerous to guess at.
Iron deficiency, with or without anemia, lowers endurance performance. A 2025 review of high-level female athletes found deficiency lowered performance by about 3 to 4 percent, while about 100 mg per day of elemental iron improved it by 2 to 20 percent (Pengelly, J Sport Health Sci, 2025). An earlier meta-analysis found iron treatment produced a large effect on ferritin and a moderate effect on VO2 max in iron-deficient but non-anemic endurance athletes (Burden, Br J Sports Med, 2015).
Runners lose iron through foot-strike hemolysis and sweat. But supplement only on bloodwork, because excess iron is harmful, and keep the dose away from calcium, coffee, and tea, which all reduce absorption.
Verdict: Grade C, corrective.
Iron has the strongest case in a runner who is genuinely low, and the weakest case in a runner who is not.
Protein and Leucine
Protein supports recovery and adaptation, not the run itself.
The daily target is 1.4 to 2.0 g per kg of body weight. Each serving should deliver about 20 to 40 g, or 0.25 g/kg, of high-quality protein with 700 to 3,000 mg of leucine, spread every 3 to 4 hours (Jäger, J Int Soc Sports Nutr, 2017). Take it after key sessions and long runs, and spread it across the day rather than loading it all at dinner.
Verdict: Grade A for recovery and adaptation.
Protein does not make you faster during the run. It makes you ready for the next one.
Magnesium
Magnesium for cramps is a persistent belief in running, and the evidence does not support it.
A Cochrane review of 11 trials in 735 people found no statistically significant reduction in cramp frequency, a mean difference of -9.59 percent at four weeks (95 percent CI -23.14 to 3.97) (Garrison, Cochrane Database Syst Rev, 2020). It also found that no randomized trials even covered exercise-associated cramps, the exact thing runners take it for.
Magnesium still has legitimate roles in nutrition and sleep, just not as a running performance or cramp fix. The types of magnesium guide explains how the forms differ.
Verdict: Skip for cramps, Grade C otherwise.
If magnesium prevented cramps, eleven controlled trials would have found it. They did not.
Antioxidants: Vitamin C and E
High-dose antioxidant supplements can blunt the adaptations you train for. Exercise creates oxidative signals that push the body to get fitter, and flooding the system with antioxidants can suppress them (Rothschild, Sports Med, 2020).
The dose that did it in a controlled trial: 1,000 mg of vitamin C plus 235 mg of vitamin E daily for 10 weeks blunted key signalling proteins after exercise and reduced some strength gains (Paulsen, J Physiol, 2014). The NIH Office of Dietary Supplements has said plainly that these vitamins appear to hinder some exercise-induced adaptations.
- Get vitamin C and E from food, in small amounts.
- Do not load them around training, especially during a training block.
Verdict: Skip at high dose during training.
The supplement that blunts your training is worse than the supplement that does nothing.
The Skip List
Here is where the money usually goes to die.
- BCAAs. Research suggests BCAAs reduce markers of muscle damage and soreness at 24 to 72 hours, but the practical value is low when protein intake is adequate, because BCAAs are an incomplete protein and whole protein is cheaper and better.
- Glutamine. No endurance performance evidence to support it.
- Fat burners. Not supported for endurance, with stimulant and stomach risk.
- High-dose antioxidant loading. Covered above, and it can work against your training.
- Most proprietary endurance blends. The individual ingredients are usually underdosed and the blend hides the amounts. If the label will not state the milligrams, assume they are too low to matter.
- Magnesium for cramps. Covered above.
Dose and Timing for Endurance Athletes
| Supplement | Dose used in trials | Timing | Grade |
|---|---|---|---|
| Carbohydrate | 30 to 60 g/h, toward 90 g/h with multiple transportable carbs | During exercise past about 90 minutes | A |
| Caffeine | 3 to 6 mg/kg, possibly as low as 2 mg/kg | 45 to 60 minutes before | A |
| Dietary nitrate | 300 to 600 mg | 2 to 3 hours before, or 3 to 6 days of loading | B |
| Beta-alanine | 4 to 6 g/day, split into servings of 1.6 g or less | Daily for at least 2 to 4 weeks | B |
| Sodium | Matched to sweat losses; above 575 mg/L in heat | During long or hot events | B |
| Protein | 1.4 to 2.0 g/kg/day, 20 to 40 g per serving | After key sessions, spread through the day | A |
| Creatine | 3 to 5 g/day | Daily, no loading needed | C for endurance |
| Tart cherry | Recovery format used in the trials | Around hard blocks and races | B |
| Collagen plus vitamin C | 10 to 15 g collagen plus about 50 mg vitamin C | Before load | B |
| Vitamin D | Correct a documented shortfall, typically 1,000 to 2,000 IU/day | With a meal | C |
| Iron | About 100 mg/day elemental, only with bloodwork | Away from calcium, coffee, and tea | C |
| Magnesium | Not supported for cramps | Not applicable for running performance | Skip for cramps |
Your own dose depends on body mass, sweat rate, and event.
Race Day and Training Phase Timing
| Phase | What belongs here |
|---|---|
| Base | Protein at 1.4 to 2.0 g/kg/day, vitamin D and iron only if you tested low, creatine if the plan includes sprint and strength work |
| Peak | Carbohydrate during long sessions, caffeine trialed in hard efforts, beta-alanine loaded if your event has a 1 to 4 minute surge |
| Taper | Keep habits stable, add nothing new, hold your caffeine tolerance |
| Race day | Carbohydrate at 30 to 60 g/h, sodium to your sweat losses, caffeine at 3 to 6 mg/kg about 45 to 60 minutes out, nitrate 2 to 3 hours out if you respond |
| Recovery | Protein plus carbohydrate after long runs, tart cherry around hard blocks, collagen if you have a tendon history |
One rule overrides the table: never debut a supplement on race day. Test everything in training first. For timing across a normal day, see the best time to take vitamins guide.
Safety and Third-Party Testing
Caffeine
- The general adult ceiling is about 400 mg per day.
- Around 9 mg/kg adds side effects without added benefit (Guest, J Int Soc Sports Nutr, 2021).
- Mind the sleep cutoff. Caffeine lingers, and a late dose can cost you the recovery training depends on. See the sleep supplements guide.
Buffers and Tingling
- Sodium bicarbonate is a buffer for short, hard efforts, but stomach upset is common and scales with the dose. Test it in training and never debut it on race day.
- Beta-alanine paresthesia is harmless but distracting. Split servings to 1.6 g or less (Trexler, J Int Soc Sports Nutr, 2015).
Iron and Testing
- Supplement iron only on bloodwork, and keep it away from calcium, coffee, and tea.
- NSF Certified for Sport and Informed Sport both test products for contaminants and banned substances, so choose a product that carries one of those marks if you compete under a testing program.
For a tested athlete, a contaminated product is not a bad batch. It is a ban.
What We Recommend
These are the products that map most directly to the categories this guide grades highest, all verified in stock at Agape Nutrition.
Enzyme Science, MyoMend 60 and 120 Capsules
A proteolytic enzyme blend that supports muscle tissue repair and recovery around hard training blocks and long-run weeks.
$42.49
Protocols For Health, ATP Spark (Mixed Berry) 30 Servings
An electrolyte and B-vitamin energy drink mix that carries caffeine, matching the fluid and caffeine levers this guide ranks highest.
$73.99
XYMOGEN, SynovX Performance 60 Capsules
A joint mobility formula built for active adults, aimed at the connective tissue and joint comfort that heavy mileage stresses.
$68.99
HumanN, SuperBeets 1000 mg Beet Root 90 Capsules
Beet root capsules that support nitric oxide production and blood flow.
$19.95
Frequently Asked Questions
What are the most evidence-backed supplements for endurance athletes?
The shortlist is carbohydrate, caffeine, dietary nitrate, beta-alanine, and protein with leucine. Caffeine has the strongest case, improving mean power output by about 3.03 percent across 46 studies (Southward, Sports Med, 2018), which is the same narrow pattern the IOC consensus describes (Maughan, Br J Sports Med, 2018).
What is the right beta-alanine dosage for runners, and how long until it works?
Use 4 to 6 g per day, split into servings of 1.6 g or less, for at least 2 to 4 weeks, which raises muscle carnosine by 40 to 60 percent (Trexler, J Int Soc Sports Nutr, 2015). It works on efforts of about 1 to 4 minutes, not steady-state endurance (Hobson, Amino Acids, 2012).
Does beetroot juice actually improve running performance, and how much nitrate do I need?
Take 300 to 600 mg of nitrate, 2 to 3 hours before effort, or load daily for 3 to 6 days (Hoon, Int J Sport Nutr Exerc Metab, 2013). The benefit is clearest for time to exhaustion (effect size 0.79) and small and non-significant for time trials (0.11) (Hoon, 2013).
How much caffeine should I take before a run, and when?
Take 3 to 6 mg/kg of body mass, 45 to 60 minutes before exercise, and some trials show benefit as low as 2 mg/kg (Southward, Sports Med, 2018; Guest, J Int Soc Sports Nutr, 2021). Response varies, so trial your dose in training first (Southward, 2018).
Do I need electrolytes for running, and how much sodium?
Sodium needs are individual and scale with sweat rate and sweat sodium concentration. In a 161 km ultra, 93.9 percent of finishers used sodium supplements, yet hyponatremia still occurred in 6.6 percent, and avoiding overhydration mattered far more (Hoffman, Med Sci Sports Exerc, 2015).
Are antioxidants like vitamin C and vitamin E good or bad for runners?
At high dose during training, they are a problem. A controlled trial giving 1,000 mg of vitamin C plus 235 mg of vitamin E daily for 10 weeks blunted key signalling proteins and reduced some strength gains (Paulsen, J Physiol, 2014).
What should I take after a long run for recovery?
Carbohydrate plus protein. Aim for 1.4 to 2.0 g per kg per day, with 20 to 40 g of protein and 700 to 3,000 mg of leucine per serving every 3 to 4 hours (Jäger, J Int Soc Sports Nutr, 2017), plus tart cherry as a possible add-on for soreness (Daab, Sports Med Open, 2026).
Can supplements improve my VO2 max?
Almost nothing raises VO2 max directly. Creatine actually showed a negative effect, with a between-group effect size of -0.32 (Gras, Crit Rev Food Sci Nutr, 2023). Iron is the exception, but only in deficient athletes, where treatment produced a moderate effect on VO2 max (Burden, Br J Sports Med, 2015).
References
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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.