Supplements for running are tools, not a compulsory stack. Most sessions begin with enough food, fluid, sleep and recovery. A sports food, electrolyte drink or performance ingredient becomes useful only when it solves a defined problem for the run, conditions and runner.
The Australian Institute of Sport separates sports foods, medical supplements and performance ingredients because they do different jobs.[1] This guide applies that distinction to training and competition day without promising that a powder or capsule can replace preparation.
Safety note: Seek clinical advice for chest pain, fainting, unusual breathlessness, persistent fatigue, recurrent injury, gastrointestinal bleeding or unexplained performance decline. Speak with a healthcare professional before supplementation if you have kidney, heart or gastrointestinal disease, take medicines, are pregnant, or compete under anti-doping rules.
Evidence checked: 20 July 2026
Runners need food and fuel before a supplement
A balanced diet supplies carbohydrate, protein, fats and micronutrients. Enough total energy is also part of performance: consistently under-fuelling can impair training, recovery and overall health. The first plan should therefore cover meals, snacks, fluid, sleep and the practical demands of each session.
Ordinary food is often enough around short or easy running. A runner’s needs change as duration, intensity, heat, sweat loss and access to food change. Sports foods offer convenience when chewing or carrying normal food is impractical; they are not evidence that every runner needs a branded product.
Use a simple question: what problem will this solve? Carbohydrate may support a long effort, fluid and sodium may help in particular conditions, and a targeted nutrient may correct a confirmed deficiency. If the answer is only “more energy”, investigate food intake, recovery and symptoms before assuming supplementation is the answer.
Are products necessary? Often they are not. Endurance runners may use supplements when normal food is impractical, while certain supplements have a narrow medical or performance role. Many people do not need supplements, and there is no fixed list of supplements you need. The useful choice should support your training without disguising inadequate intake, illness or excessive load.
For each runner, consider the least complicated option first. Taking a multivitamin does not correct insufficient meals, and an energy claim does not show a deficiency. Food, sleep and an appropriate programme may aid in recovery more reliably than an untested blend.
The aim is not to discover the best supplements by copying a ranking. The supplements runners see marketed often bundle unrelated promises. Do not take supplements because a label says it can “increase energy and support” recovery or “support the stress response”. Do not take a supplement for a training problem until its purpose, evidence and safety are clear. Amino acid supplements are also unnecessary when the eating pattern already supplies enough suitable protein.
Hydration and electrolyte choices for long runs
Sweat rate and sodium loss differ substantially. Weather, pace, body size, clothing and access to drinks also matter. The aim is an individual hydration plan, not drinking as much as possible. Excessive fluid intake can be dangerous, while inadequate intake can reduce comfort and performance.
Traditional sports drinks combine water, carbohydrate and some electrolytes. Low-sugar electrolyte products may help supply fluid and sodium but provide little energy. Read the label so the product matches the job.[2]
A sports gel is compact carbohydrate. AIS guidance indicates it is generally unnecessary for brief exercise, while a longer session may require planned carbohydrate from sports foods or ordinary food.[3] Take a gel with appropriate water unless its instructions say otherwise. Practise the exact product in training; do not introduce a new flavour, concentration or caffeine amount on race day.
Iron supplement, vitamin B12 and vitamins and minerals
Iron helps blood to transport oxygen through haemoglobin in red blood cells. Endurance athletes can be at increased risk, especially with menstruation, vegetarian or vegan eating, low energy availability, blood donation, altitude exposure or high training volume.[4] Fatigue alone does not diagnose deficiency. Oral iron should follow appropriate blood tests, consideration of the cause and a clinician-led plan.
B12 supports blood and neurological function. Risk is more relevant with vegan eating, older age, pernicious anaemia, bariatric surgery, metformin or proton-pump-inhibitor use.[5] A reliable source is important for a vegan diet, but more B vitamins do not automatically improve energy production when status is adequate.
Vitamin D relates to bone health, but risk depends on sun exposure, skin coverage, location, age and medical context.[6] Testing and treatment should be targeted. Vitamin C from food can support iron absorption; a high-dose antioxidant product is not a substitute for fruit and vegetables or a general performance strategy.
Best supplements for runners: caffeine and dietary nitrate
Caffeine and dietary nitrate are AIS Group A performance ingredients for specific situations.[1] That classification means there is strong evidence for selected uses with evidence-based protocols. It does not mean all people will benefit or should take them.
Caffeine may reduce perceived effort and support some longer or harder performances, but response varies. Anxiety, tremor, gastrointestinal upset, heart symptoms and disrupted sleep can outweigh any benefit. Add all sources, including coffee, pre-workout, gum and caffeinated sports food, before deciding.[7]
Concentrated beetroot juice can provide a measured nitrate source and has evidence in some running and other exercise settings. Products vary: an ordinary vegetable powder may not disclose or reliably supply the amount used in research.[8] Test tolerability and the full protocol in training with a sports dietitian rather than copying a race-week plan online.
These ingredients can affect running performance, but “evidence based” still means event-specific. A strategy for intense training may be unnecessary for an easy session. Practise the complete plan and stop if adverse effects outweigh the intended benefit.
Creatine and magnesium for a runner
Creatine monohydrate has strong evidence for repeated high-intensity exercise, muscle strength and power. It may fit a programme that includes sprinting or resistance training, but it is not a universal distance-running aid. Possible body-mass change, gastrointestinal tolerance, kidney context and the actual training goal should be considered.
Magnesium contributes to muscle contraction and relaxation, yet cramps do not prove magnesium deficiency. They can relate to fatigue, pacing, conditioning, heat, fluid or other factors rather than simply lactic acid. Extra magnesium may cause diarrhoea, and kidney impairment changes safety. Choose testing or clinical assessment where indicated instead of treating every cramp with a supplement.
Joint health and the capacity of tendons and ligaments depend on more than a capsule. Training load, strength, adequate energy, injury history and clinical diagnosis matter. No supplement can guarantee injury prevention.
Protein supplements are simply a convenient option when protein from food is impractical. A powder can support muscle recovery when it helps meet total needs, but it is not superior to an adequate meal by default. The training stimulus, total intake and timing across the day remain important for muscle function and supporting recovery.
How marathon runners choose a powder
Before runners take a product into extended sessions, they should trial it under similar pace and weather conditions. Record the brand, serving, fluid, timing and gut response. Build a plan that can be carried or collected on the course, and keep a backup that has also been practised.
Competitive long-distance runners must also manage contamination risk. Sport Integrity Australia recommends a food-first approach and checking the exact batch in its app. HASTA or Informed Sport batch testing lowers risk but cannot guarantee that no banned substances are present.[9]
Nutrition Market’s generic sports-recovery feed is disabled on this guide. Its current eligible set mixes creatine and electrolyte products without knowing the individual’s nutrition, fluid or performance purpose. Products must not render until the feed separates those roles, checks live stock, COGS, margin and exact-batch status, and passes dual clinical review.
Questions runners ask about a supplement
Which supplement is best for running?
There is no single best product. For a long event, the useful tool may be a practised carbohydrate source; in hot or high-sweat conditions it may be a suitable fluid and sodium plan. Iron is only for a supported clinical need, while caffeine or nitrate requires an individual performance protocol.
What supplements to use for running?
Start with the run’s duration, intensity, conditions and access to food and fluid. Use sports foods for a practical fuelling or fluid-planning problem, targeted nutrients for confirmed risk or deficiency, and performance ingredients only when evidence, tolerance and the event support them.
What is the 80% rule for running?
It commonly refers to a training idea in which most running is easy and a smaller portion is hard. It is not a supplement, fuelling or fluid rule, and an appropriate training distribution depends on the programme and runner.
What to do 30 minutes before a run?
Use the routine already tested in training. For many short easy sessions, that may be normal meals and a comfortable amount of fluid. Before a longer or harder run, a familiar low-fibre carbohydrate food or sports food may be practical. Do not trial a new pre-workout or large fluid load immediately before starting.
References
- Australian Institute of Sport. Group A supplements. Accessed 20 July 2026.
- Australian Institute of Sport. Sports drinks. Accessed 20 July 2026.
- Australian Institute of Sport. Sports-food factsheet. Accessed 20 July 2026.
- Australian Institute of Sport. Iron. Accessed 20 July 2026.
- Healthdirect Australia. Vitamin B deficiency. Last reviewed February 2026.
- Healthdirect Australia. Vitamin D deficiency. Accessed 20 July 2026.
- Australian Institute of Sport. Caffeine. Accessed 20 July 2026.
- Australian Institute of Sport. Dietary-nitrate factsheet. Accessed 20 July 2026.
- Sport Integrity Australia. Supplements in sport. Accessed 20 July 2026.
