Supplements for runners|Supplements for runners|

01 · When supplements helpWhen supplements make sense

A good basic diet — with sufficient carbohydrates, proteins, healthy fats and micronutrients — always remains step one. Supplements are not a replacement for real food, but can provide strategic support when your body requires more than you get from food every day. Think of heavy training weeks, higher volume towards a competition, periods with little sunlight or moments when recovery requires extra attention.

For runners it is not about “taking more”, but about targeted supplementing what you lack. The biggest gains usually come from simple basics: vitamin D in the winter, magnesium when sweating a lot, electrolytes during hot training and caffeine during races. Everything beyond that only makes sense if it fits your goals and load — and if your diet is already properly organized.

First, make sure your recovery meals are in order. Recovery Nutrition: Best Post-Workout Snacks and Drinks provides practical examples of complete recovery options that provide the foundation before reaching for supplements.

02 · Gels and sports drinksGels / sports drinks while running

Gels and sports drinks aren't just for marathon runners — they're an instant source of quickly absorbed energy. During intensive exercise, your body is highly dependent on carbohydrates. As soon as your glycogen stores start to decline, you will notice this in your legs feeling heavy, a decreasing pace and an increasing heart rate. By feeding on time, you prevent that “blow” and you can maintain your pace for longer.

During races (5 km, 10 km, half marathon, marathon or a personal record), gels are the most efficient way to reach your carbs per hour. Most sports gels contain 20–30 grams of carbohydrates, and many sports drinks 30–60 grams per liter. For optimal performance, aim for 30–60 grams of carbohydrates per hour on runs longer than 75–90 minutes.

Do you use gels? Always test them during training: taste, texture and stomach tolerance differ enormously per brand. Combine gels with water and adjust your food timing to your pace and point in the race.

03 · Commonly used supplementsCommonly used supplements

Not every supplement has the same benefit, but some can provide clear added value for runners — if chosen well and dosed correctly. Below you will find the most commonly used options with a brief explanation when they make sense.

Magnesium

Magnesium plays a role in muscle contraction, nerve conduction and relaxation. For runners, it especially helps to reduce cramps, stiff calves and restless legs. It is not a panacea, but it is useful if:

Dosage: 200–400 mg in the evening, preferably magnesium bisglycinate or magnesium citrate (good absorption, less chance of intestinal complaints). In addition, make sure your fluid and salt balance is correct. View the chart in Hydration during hot runs to better estimate sweating and mineral loss.

Protein

Proteins provide amino acids that your body uses to repair muscle fibers and support the immune system. A shake is especially useful when you:

Dosage: 20–25 g protein within 60 minutes after exercise (whey or vegetable such as pea/rice). A shake does not replace a meal, but is perfect for the first recovery moment.

Vitamin D

Vitamin D supports bone health, muscle function, resistance and hormonal balance. Runners who see little sun, work office hours or train in the winter months often have low values.

Dosage: 1000–2000 IU per day is a usual safe amount for low blood values. If possible, have your blood values measured for personal advice. Optionally combine with vitamin K2 for better absorption and bone health.

Nitrates (beetroot juice)

Nitrate supplements, such as concentrated beet juice, can reduce the oxygen cost of exercise. That means you need less oxygen at the same pace — a subtle but effective advantage in competition. Mainly works for:

Dosage: 400–600 mg nitrate (usually 1 shot of beetroot juice) 2–3 hours before exercise. Please note: always test beet juice in advance due to... stomach reaction.

Use nitrates specifically around speed training. Improving running speed: 6 proven methods gives examples of sessions where beetroot juice provides extra value.

04 · Supplement comparisonComparison of supplements for runners

Supplements can support your training, but only if your basic nutrition, sleep and recovery are already in order. They do not replace good meals, but can provide that extra support during tough training weeks, hot conditions or competition preparations. This table helps you see at a glance which supplements are actually relevant for runners — and when to use them.

05 · Use guidelinesGuidelines for wise use

Supplements can be valuable, but only if you use them thoughtfully and purposefully. Many runners take too much, too often or without knowing what their body really needs — resulting in waste or even side effects. By following a few simple guidelines, you will get the benefits of supplements without the pitfalls.

Don't forget that sleep and recovery remain the foundation. Sleep and Recovery: Impact on Your Performance shows how rest can reduce your need for supplements.

06 · Do you need supplements?Checklist: do you need a supplement?

Supplements seem attractive, but not every runner needs them — and certainly not always. A good decision starts with self-evaluation: what do you eat, how do you train, and what are you trying to solve? This checklist will help you make more conscious choices and prevent unnecessary or incorrect supplementation. Think of it as a short reality check before you buy something.

Before you start, ask yourself these five questions:

07 · MistakesCommon mistakes

Supplements can be useful, but only if you use them in a targeted and thoughtful manner. Many runners jump into them too quickly, rely on marketing claims or use them at times when nutrition or recovery is actually the real problem. By avoiding these common mistakes, you can benefit from supplements — without the risks or disappointments.

08 · FAQFrequently asked questions

09 · RelatedRelated articles