What Supplements Do Runners Take? | The Real Shortlist

If you line up a group of runners and ask what supplements they take, you’ll hear the same few answers again and again. Caffeine shows up in about a third of middle-distance runners’ routines, while energy bars, sports drinks, and creatine follow close behind. Among international athletes, recovery shakes top the list. The pattern holds across most surveys: caffeine for the pre-run jolt, carbohydrates and electrolytes to fuel the miles, and protein for the repair work after.

Here’s the part most supplement aisles don’t advertise: the strongest scientific support for endurance performance comes down to just four things — carbohydrates, caffeine, nitrates, and iron (and only when you’re actually deficient). Plenty of other products you’ll see marketed to runners are situational, or simply unnecessary for most people.

What Runners Take Before, During, and After Runs

Supplement timing follows the run itself. Before heading out, caffeine and often beetroot juice or nitrates lead the way. During long efforts, carbohydrate gels, chews, and drinks keep energy up while electrolytes replace what sweat takes out. After you finish, protein powder or recovery shakes step in for muscle repair.

Daily-use supplements like creatine, vitamin D, and omega-3s sit outside that run-day cycle, taken consistently rather than timed to a workout. Iron also belongs in this daily group, but only when bloodwork shows you need it — more on that below.

Which Supplements Actually Help Runners?

Not every supplement lives up to its marketing. Here’s the honest breakdown of what the evidence and sports nutrition guidance support, and how runners use each one.

Caffeine is the most widely used performance supplement for good reason. It boosts alertness and staves off fatigue, and the evidence behind it is solid. Most runners take it 30 to 60 minutes before a run; one evidence-backed guide calls for 3 to 6 milligrams per kilogram of body weight about 45 to 60 minutes beforehand. Sensitivity varies, so start low and watch your sleep.

Carbohydrates are the fuel that keeps you moving on long runs. Gels, chews, and sports drinks deliver fast energy, and runners typically take a gel every 30 to 45 minutes during extended efforts. If you’re running under about 60 to 90 minutes, you likely don’t need them at all.

Protein after running or strength work supports muscle repair. Protein powder is simply a fast, convenient option when a whole-food meal isn’t practical — it’s not magic, just practical.

Electrolytes replace the sodium, potassium, magnesium, and calcium you sweat out, especially in hot or humid conditions. Salt tabs and drink mixes are common for long summer runs.

The standard maintenance dose is 3 to 5 grams a day, taken consistently for weeks, not as an instant fix.

Beetroot juice or dietary nitrates support endurance on race day. One guide recommends 6 to 12 millimoles of nitrate two to three hours before the start.

For those looking to narrow down their choices, the top-rated energy supplements for running break down what works for different training styles.

Iron, Vitamin D, and the Rest — Situational, Not Essential

Iron deserves special caution. It’s genuinely important for runners, especially women and vegetarians or vegans, but only when you’re actually low. Taking it without a documented deficiency can do more harm than good. Get bloodwork and a clinician’s guidance before you start.

Vitamin D gets attention when sun exposure is low, and omega-3s are taken for joint and inflammation support — though that evidence is more situational than essential. Beta-alanine targets harder, higher-intensity efforts and needs at least four weeks of loading to work. Magnesium comes up constantly in cramps and sleep discussions, but the evidence for broad performance gains stays limited.

The Common Mistakes Runners Make

The biggest error is reaching for a pill to fix what a better diet would solve. Supplements supplement — they don’t replace food. Beyond that, the most frequent missteps are cheap to avoid.

• Using iron without a documented deficiency — the most dangerous mistake on this list.
• Expecting one product to help every runner; your needs depend on training load, diet, and your specific situation.
• Skipping third-party testing. Runner-specific guidance warns to look for products verified by NSF Certified for Sport, Informed Sport, or USP Verified to lower the risk of banned substances.

Sprinters and mid-distance runners may lean on sodium bicarbonate or beta-alanine for short, intense efforts, while endurance runners more often reach for carbs, caffeine, electrolytes, and nitrates. If you have a medical condition or take medication, check with a healthcare provider before adding anything new. The evidence-based path is simple: eat enough, use caffeine and carbs when the run demands them, add protein after, and let labs decide whether iron belongs in your routine.