Should Endurance Athletes Take Creatine?

Should Endurance Athletes Take Creatine? 

Research-driven insights on how creatine supports endurance performance, hydration, and recovery — without unwanted bulk.

When you think creatine, you might picture bodybuilders chasing PRs in the weight room. But decades of research now show that creatine can also help endurance athletes, like cyclists, triathletes, and runners, handle surges, recover faster, and close races stronger (1).

At INFINIT, we’re all about performance science that fuels smarter. Let’s break down how creatine works, why it matters for endurance performance, and how to use it safely and effectively.

What Is Creatine and How Does It Work?

Creatine is a naturally occurring compound made from the amino acids arginine, glycine, and methionine (1,2). It’s produced in the liver and kidneys and found in small amounts in foods like meat and fish (2).

Inside your muscles, creatine is stored as phosphocreatine (PCr) — a high-energy phosphate donor that helps regenerate ATP, the body’s main energy currency. Think of it as your body’s quick-access energy reserve: when your phosphocreatine tank is full, you can sustain higher-power bursts for longer.

Even omnivores can’t fully saturate creatine stores through diet alone, but supplementation can raise intramuscular creatine by roughly 20%, improving short-term energy availability during high-intensity or repeated efforts (1).

Why Endurance Athletes Should Care

While creatine is famous for building strength and sprint speed, endurance athletes can also benefit in several key ways.

1. Stronger Surges and Finishing Kicks

Endurance races aren’t steady-state. They’re filled with pace changes, climbs, and finishing sprints — all fueled by the phosphagen system. By regenerating ATP faster and buffering acid buildup, creatine lets you maintain higher power during those crucial bursts (1).

In elite cyclists, combining creatine with carbohydrate loading improved closing-sprint power in a 120 km time trial without hurting overall time (3).

2. Enhanced Glycogen Storage

Creatine supplementation promotes greater glycogen storage and faster carbohydrate resynthesis (4). Extra glycogen equals more readily available energy for long sessions and quicker recovery between workouts — a big win for multi-day training blocks.

3. Faster Recovery and Less Inflammation

Studies show creatine can blunt post-exercise inflammation and muscle damage markers such as TNF-α and PGE₂ after long endurance events (5,6). Translation: less soreness and faster turnaround for your next ride or run.

4. Better Hydration and Thermoregulation

Creatine naturally draws water into muscle cells, supporting intracellular hydration and possibly helping with thermoregulation in the heat (2). Many endurance athletes notice muscles feel “full” — not bloated — when properly hydrated and fueled.

5. Cognitive and Neuromuscular Support

By improving cellular energy delivery to both muscle and brain tissue, creatine may enhance focus, coordination, and reaction time during prolonged, high-fatigue conditions (1).

How to Supplement Safely

There are two proven strategies for raising muscle creatine stores:

1. Loading + Maintenance: 20 g/day (split into 4–5 doses) for 5–7 days, then 3–5 g/day maintenance (2,7).

2. Gradual Saturation: 3–5 g/day for ~4 weeks achieves the same results with less water retention (1,2).

Pro Tip: Combine creatine with carbs or protein — for example, mix it into your post-workout recovery shake — to boost uptake and glycogen resynthesis (4).

At INFINIT, it’s easy to hit your daily target:

• Custom Fuel Blends: Optional 400 mg non-GMO, vegan-friendly creatine monohydrate per serving. One serving = One hour of fuel — so, for example, fueling a 3 hour workout would give you 1.2 grams of creatine.
• Custom Protein Blends: 3 g per serving — right in the recommended maintenance range. Or combine with a Custom Fuel Blend with creatine, and you’re hitting the mark for the Gradual Saturation strategy’s dosage.

Myth Busting

“Creatine makes you gain weight.”
Creatine may add 1–2 lb of intracellular water — not fat — which actually supports hydration and power output (1,2).

“It’s only for strength athletes.”
Creatine also enhances time-to-exhaustion, work above critical power, and finishing sprints in endurance events (1,3,8).

“It hurts your kidneys.”
Long-term data show no negative effects on kidney or liver function in healthy users following recommended doses (7).

How to Integrate It

• Form: Creatine monohydrate — the most researched, effective, and pure form.
• Dose: 3–5 g per day for maintenance.
• Timing: Any time of day; post-workout with carbs/protein is ideal.
• Hydration: Drink plenty of fluids.
• Cycle: Not required — continuous use is safe.

The Bottom Line

Creatine isn’t just for lifters. For endurance athletes, it’s one of the most researched, cost-effective, and safe ergogenic aids available.

By boosting glycogen storage, improving sprint repeatability, and enhancing recovery, creatine can help you go harder and finish stronger — whether it’s the final climb, the sprint to T2, or that last mile to the finish line.

References

1. Forbes SC, Candow DG, Neto JHF, et al. Creatine supplementation and endurance performance: surges and sprints to win the race. J Int Soc Sports Nutr. 2023; 20(1): 2204071. doi:10.1080/15502783.2023.2204071

2. INFINIT Nutrition Blog. What is Creatine? Cincinnati, OH: INFINIT Nutrition; 2024.

3. Tomcik KA, Camera DM, Bone JL, et al. Effects of creatine and carbohydrate loading on cycling time-trial performance. Med Sci Sports Exerc. 2018; 50(1): 141-150.

4. Roberts PA, Fox J, Peirce N, et al. Creatine ingestion augments dietary carbohydrate-mediated muscle glycogen supercompensation during the initial 24 h of recovery following prolonged exhaustive exercise in humans. Amino Acids. 2016; 48(8): 1831-1842.

5. Santos RVT, Bassit RA, Caperuto EC, et al. The effect of creatine supplementation upon inflammatory and muscle soreness markers after a 30 km race. Life Sci. 2004; 75(16): 1917-1924.

6. Bassit RA, Curi R, Rosa LFBPC. Creatine supplementation reduces plasma levels of pro-inflammatory cytokines and PGE₂ after a half-Ironman competition. Amino Acids. 2008; 35(2): 425-431.

7. Buford TW, Kreider RB, Stout JR, et al. International Society of Sports Nutrition position stand: creatine supplementation and exercise. J Int Soc Sports Nutr. 2007; 4(1): 6.

8. TrainingPeaks. Creatine for Endurance Athletes. Boulder, CO: TrainingPeaks LLC; 2023. Available at: https://www.trainingpeaks.com/blog/creatine-for-endurance-athletes/