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Supplements For Runners: Which Vitamins And Minerals Do You Really Need?
Updated: Aug 11
Walk into a running expo or browse a sports nutrition website and you'll find an enormous range of supplements promising better endurance, faster recovery and improved performance. From multivitamins and magnesium to creatine, iron, beetroot and protein powders, it can be difficult to know which supplements for runners are genuinely useful and which are largely unnecessary.
The reality is much simpler than the marketing suggests. Most runners do not need a large collection of supplements, particularly if they eat a varied and balanced diet that provides enough energy to support their training. However, some supplements can be useful when they correct a nutritional deficiency, make it easier to meet nutritional requirements or provide a specific performance benefit.
The important thing is understanding the difference. Supplements should complement good nutrition rather than compensate for a poor diet, and taking something simply because another runner uses it is rarely a good reason to start.
Food Should Come First
Before thinking about supplements, runners should make sure the foundations of their nutrition are right. Running increases your energy requirements, particularly as weekly mileage and the length of individual sessions increase, and consistently eating too little can affect both health and performance.
Carbohydrates provide an important source of fuel for running, while protein supports muscle repair and adaptation after training. Dietary fats, vitamins and minerals also contribute to everything from hormone and immune function to bone health and energy metabolism.
A varied diet containing fruit, vegetables, whole grains, protein-rich foods, healthy fats and appropriate dairy products or fortified alternatives will provide most runners with the majority of the nutrients they need.
Supplements become more relevant when there is a particular reason to use them rather than simply as an insurance policy against an inadequate diet.
Do Runners Need A Multivitamin?
For most runners eating a varied and sufficiently nutritious diet, a daily multivitamin is unlikely to produce a noticeable improvement in running performance.
That does not mean multivitamins are always pointless. They may be useful when someone's diet is restricted, food variety is limited or certain nutrients are difficult to obtain. However, taking a multivitamin does not automatically correct a poor diet, and more is not necessarily better when it comes to vitamins and minerals.
If you regularly eat a good variety of foods and have no known deficiencies, there is little reason to expect a standard multivitamin to suddenly make you faster or improve your endurance.
Vitamin D For Runners
Vitamin D deserves particular attention because it plays an important role in maintaining healthy bones and muscles. Unlike most vitamins, much of our vitamin D is produced when sunlight reaches the skin, which creates an obvious problem during the darker months of the year.
In the UK, the NHS advises adults and children over four to consider taking a daily supplement containing 10 micrograms of vitamin D during autumn and winter. Some people who have little or no exposure to sunlight, or who are at greater risk of deficiency, are advised to consider supplementation throughout the year.
This advice applies to the general population rather than runners specifically, but maintaining good bone and muscle health is clearly important when you're regularly placing your body under the repetitive loading created by running.
Vitamin D is therefore one supplement that UK runners should not dismiss simply because they already eat a healthy diet.
Iron For Runners
Iron is particularly important for endurance runners because it is involved in the production of haemoglobin, which helps transport oxygen around the body. Inadequate iron status can contribute to fatigue and reduced exercise capacity, making iron deficiency an important consideration when a runner experiences an unexplained decline in performance.
Some runners have a greater risk of iron deficiency than others. Female endurance athletes can be particularly vulnerable because of menstrual blood loss, while runners following vegetarian or vegan diets need to pay closer attention because iron from plant foods is generally less readily absorbed than iron from animal sources. High training loads can add further complications.
This does not mean runners should automatically take an iron supplement. Too much iron can be harmful, so supplementation is best considered following appropriate assessment and professional advice rather than being added to your diet just in case.
If you're experiencing persistent fatigue, unusual breathlessness or an unexplained deterioration in your running, speak to a healthcare professional rather than trying to diagnose and treat an iron deficiency yourself.
Magnesium For Runners
Magnesium plays a role in normal muscle and nerve function, energy metabolism and numerous other processes in the body, which has helped make magnesium supplements extremely popular among runners.
However, the fact that magnesium is important does not mean taking additional magnesium will automatically improve running performance or prevent muscle cramps. Most runners should be able to obtain adequate magnesium through foods including nuts, seeds, whole grains, legumes and leafy green vegetables.
Supplementation may be appropriate when intake is inadequate or a deficiency has been identified, but magnesium should not be regarded as an essential running supplement for everyone.
Vitamin B12 And Plant Based Runners
Vitamin B12 is needed for normal red blood cell formation and nervous system function. It is naturally found mainly in animal-derived foods, making it an important consideration for runners following vegan and some vegetarian diets.
Vegan runners should ensure they obtain a reliable source of B12 through fortified foods or supplementation. Simply eating a varied plant-based diet does not guarantee sufficient B12 because unfortified plant foods are not reliable sources.
Other nutrients including iron, calcium, iodine and vitamin D can also require additional attention in restrictive or plant-based diets. This does not make a vegan or vegetarian diet unsuitable for runners, but it does make thoughtful nutritional planning more important.
Protein Powders And Recovery Drinks
Protein powder is technically a supplement, but it is better thought of as a convenient way of adding protein to your diet rather than a performance-enhancing product.
Runners can obtain all the protein they need from normal foods, but a shake can be useful when you're short of time, travelling or struggling to consume enough protein around a busy training schedule. Whey, casein, soy and other plant-based protein powders can all provide convenient options depending on your dietary preferences.
The same principle applies to recovery drinks. They can be useful after demanding sessions when consuming normal food is inconvenient, particularly when they provide both carbohydrate and protein, but they are not inherently superior to an appropriately balanced meal or snack.
Creatine For Runners
Creatine is usually associated with strength training, bodybuilding and sprinting, but it has increasingly attracted attention among endurance athletes as well.
It has a strong evidence base for improving performance during repeated bouts of high-intensity exercise and can support strength and training adaptations. This may be useful to runners incorporating gym work, sprint training or repeated high-intensity efforts into their programme.
Creatine is less likely to directly improve steady-state endurance running, and the additional water stored within muscle can result in a small increase in body mass. Whether that trade-off is worthwhile depends on the runner and their training goals.
Caffeine And Running Performance
Caffeine is one of the best researched performance supplements available to endurance athletes. Used appropriately, it can reduce the perception of effort and improve endurance performance, which is why caffeine appears in many sports drinks, gels and pre-race products.
That does not mean every runner needs caffeine before a race. Individual responses vary considerably, and too much can cause unwanted effects including anxiety, sleep disruption and gastrointestinal problems.
If you plan to use caffeine for running, experiment during training rather than trying a large dose for the first time on race morning.
Beetroot And Dietary Nitrate
Beetroot juice and concentrated beetroot shots are popular among endurance athletes because beetroot is naturally rich in nitrate. The body can convert dietary nitrate into nitric oxide, which influences blood flow and several processes involved in exercise performance.
Research suggests that dietary nitrate can improve exercise efficiency and may benefit endurance performance in some circumstances, although individual responses vary and the effect is not equally strong in every runner.
As with caffeine, beetroot is something to test during training before relying on it for an important race.
What About Omega-3 Supplements?
Omega-3 fatty acids are important for general health and are found particularly in oily fish such as salmon, sardines and mackerel. Runners who regularly eat oily fish may already obtain sufficient long-chain omega-3 fatty acids through their diet.
Omega-3 supplements are sometimes promoted specifically for exercise recovery and reducing inflammation. Although there is research into these potential benefits, the evidence is not strong enough to regard omega-3 as an essential performance supplement for runners.
If your diet contains little or no oily fish, an omega-3 supplement may be worth discussing with a healthcare professional or dietitian, particularly if you're following a plant-based diet and considering an algae-derived alternative.
What About Glutamine And L-Carnitine?
Glutamine and L-carnitine have both been marketed to endurance athletes, but neither belongs near the top of the list for the average runner looking for evidence-based ways to improve performance.
Glutamine performs important functions within the body, while carnitine is involved in fatty acid metabolism, but that does not automatically mean taking additional amounts improves endurance. Evidence for meaningful performance improvements from routine supplementation is considerably less convincing than for established options such as caffeine and dietary nitrate.
Most recreational runners would be better served by spending their money on good food and getting their training, fuelling, sleep and recovery right.
Can You Take Too Many Supplements?
Yes. Supplements are not automatically harmless simply because they are available without a prescription. Some vitamins and minerals can be harmful when consumed in excessive amounts, while supplements can also interact with medicines or result in runners consuming several products containing the same ingredient without realising it. Iron is a particularly good example of a nutrient that should not be supplemented indiscriminately.
Competitive runners also need to consider the possibility of supplement contamination. Athletes subject to anti-doping rules are responsible for substances found in their bodies, so products that have been independently batch tested for prohibited substances provide an additional level of risk reduction.
Multi-ingredient products such as some pre-workout formulas can be particularly difficult to assess because they may contain numerous ingredients at different doses.
Which Supplements Actually Work For Runners?
There is no single list of supplements that every runner should take because nutritional and performance needs vary enormously.
Vitamin D may be appropriate because of general UK public health guidance, while iron or vitamin B12 supplementation can be important when there is an identified need. Protein powders and sports nutrition products can make meeting nutritional requirements more convenient rather than providing a special physiological advantage.
When the objective is specifically improving exercise performance, the list becomes much shorter. Caffeine and dietary nitrate have good evidence for use in endurance sport, while creatine has well-established benefits that may be particularly relevant to strength work and high-intensity training. Other supplements can have specific applications, but that does not make them necessary for the average recreational runner.
The question should therefore be less about which supplements are popular and more about whether a particular product solves a genuine nutritional or performance problem.
Should Runners Take Supplements?
Most runners do not need a shelf full of tablets, powders and capsules to run well. A balanced diet that provides enough energy, carbohydrate, protein, healthy fats, vitamins and minerals remains the foundation of both health and performance.
Targeted supplementation can nevertheless be useful. Vitamin D is particularly relevant in the UK, iron and B12 can require attention in runners at risk of deficiency, and products such as caffeine, dietary nitrate and creatine have credible evidence for specific performance applications.
Supplements work best when there is a clear reason for taking them, an appropriate dose and realistic expectations about what they can achieve.
Get your training, nutrition, hydration, sleep and recovery right first. Once those foundations are in place, the right supplement used for the right reason may provide an additional benefit, but it will never replace the fundamentals that make you a healthier and better runner.
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