Whether you are a marathon runner, triathlete, or long-distance cyclist, your performance depends not only on your training and dedication, but also on how you fuel your body. Dietary supplements have become indispensable allies for athletes seeking to maximize their endurance, accelerate recovery, and maintain a high level of performance. What are the essential dietary supplements for regular endurance sports participants? We will explain their role, benefits, and how to incorporate them effectively into your daily routine.

I. The importance of dietary supplements for endurance athletes

Why dietary supplements?

Endurance sports place high energy demands on the body that often exceed what a traditional diet can provide. Dietary supplements fill nutritional gaps, offering specific nutrients in appropriate amounts to support prolonged effort. Although a traditional diet can provide a solid foundation of essential nutrients, it is often insufficient to meet the specific and intense needs of endurance athletes. However, dietary supplements should not replace a quality diet that meets athletes' needs. They are intended for cases of deficiency, to compensate for difficulties in providing enough of a micronutrient or for malabsorption.

During intense exercise, athletes lose a significant amount of vitamins and minerals through sweat. Minerals such as sodium, potassium, magnesium, and calcium are crucial for maintaining electrolyte balance, muscle function, and nerve transmission. A deficiency in these micronutrients can lead to cramps, fatigue, and drops in performance, as we will see later in the article.

II. Supplements specifically for sports

• Protein and amino acids

Protein is essential for muscle repair and growth. After an intense workout or competition, muscles sustain micro-tears that require protein to be repaired. Protein shakes, often made with whey (whey protein), are particularly popular because they are quickly absorbed by the body, providing the amino acids needed for muscle repair without delay.

BCAA (branched-chain amino acids), which include leucine, isoleucine, and valine, are particularly beneficial for endurance athletes. In his book “Dietary Supplements for Athletes” (which I encourage you to read), Michael Gundill explains that BCAA can help reduce muscle breakdown during exercise and decrease fatigue by inhibiting serotonin production in the brain. Regular BCAA intake can also improve recovery and performance by providing essential building blocks for the muscles.

• Carbohydrates and energy drinks

Carbohydrates are the primary source of energy for endurance efforts. During exercise, the body uses glycogen stores stored in the muscles and liver. Adequate carbohydrate intake before, during, and after exercise is crucial for maintaining high energy levels and avoiding fatigue. Energy gels, bars, and drinks are convenient ways to provide readily available carbohydrates.

Energy drinks provide not only carbohydrates, but also essential electrolytes such as sodium, potassium, and magnesium, which are lost through sweat. Michael Gundill also emphasizes that maintaining an adequate electrolyte balance is vital for preventing cramps, maintaining muscle function, and optimizing hydration.

• Supplements for endurance and performance

Beta-alanine is an amino acid that helps increase carnosine levels in the muscles. Carnosine plays a key role in reducing muscle acidity during intense exercise, which may delay the onset of fatigue. Michael Gundill mentions that beta-alanine is particularly effective for high-intensity, prolonged efforts, helping athletes maintain their performance for longer.

Caffeine is well known for its stimulating effects. It improves alertness, reduces the perception of effort, and may increase the mobilization of fat as an energy source, thereby preserving glycogen stores. Caffeine can be consumed in the form of capsules, gels, or drinks, but it is important to use it strategically to avoid side effects such as anxiety or sleep problems. Caffeine is often used during ultratrails or ultra-cycling events to stay awake when spending a night outdoors. Do not exceed 100 mg of caffeine to avoid adverse effects.

Nitrates, often found in beetroot juice, improve mitochondrial efficiency and increase nitric oxide production, which may improve blood circulation and oxygen delivery to the muscles. Nitrates could increase endurance and improve performance in sports requiring prolonged exertion.

III. Supplements for recovery and overall health

For endurance athletes, recovery and overall health are just as important as performance during training and competitions. Here is a list of essential supplements that can help optimize recovery and maintain good overall health.

       1)   Antioxidants and anti-inflammatories

Vitamin C

• Role: Vitamin C is a powerful antioxidant that helps protect cells against oxidative damage caused by intense exercise. It also plays a key role in collagen synthesis, which is essential for tissue repair and joint health.
• Food sources: Citrus fruits         (oranges, grapefruits),        strawberries, kiwis, bell peppers, broccoli.

Vitamin E

• Role: Vitamin E protects cells against damage from free radicals produced during exercise. It also contributes to immune function.
• Food sources: Vegetable oils (sunflower oil, olive oil), nuts and seeds, avocados, spinach.

Curcumin

• Role: Extracted from turmeric, curcumin has natural anti-inflammatory properties. It helps reduce muscle and joint pain after intense exercise.
• Food sources: Turmeric (often consumed as a supplement because of its low dietary bioavailability).

       2)    Omega-3 fatty acids

Their role

• Omega-3 fatty acids, found mainly in fish oil, have anti-inflammatory properties that help reduce inflammation caused by intense exercise. They are also essential for cardiovascular health and can improve blood circulation and lung function, which are critical aspects for endurance athletes.

Dietary sources

• Oily fish (salmon, mackerel, sardines), flaxseeds, nuts, flaxseed oil, canola oil.

       3)   Vitamins and minerals

Magnesium

• Role: Magnesium is crucial for muscle and nerve function, energy production, and protein synthesis. A deficiency can cause muscle cramps, fatigue, and reduced performance.
• Dietary sources: Nuts and seeds (almonds, cashews, sunflower seeds), green vegetables, legumes, whole grains.

Iron

• Role: Iron is essential for transporting oxygen in the blood and producing energy. A deficiency can lead to anemia, reducing endurance capacity and increasing fatigue.
• Dietary sources: Red meat, poultry, fish, legumes, spinach, tofu.
• Warning: iron overdosing can be very harmful to you!

Zinc

• Role: Zinc plays a crucial role in immune function, cell repair, and cell growth. A deficiency can impair recovery and increase the risk of infections.
• Dietary sources: Meat, seafood (oysters), legumes, seeds, nuts.

Vitamin D

• Role: Vitamin D is essential for calcium absorption and bone health. It also plays a role in immune function and reducing inflammation.
• Dietary sources: Sun exposure (skin synthesis), oily fish (salmon, mackerel), fortified dairy products, eggs, mushrooms.

5) Proteins and amino acids for recovery

Proteins

• Role: Proteins are necessary for muscle repair and growth, particularly after intense training sessions. Protein powders, such as whey, casein, or plant-based proteins, provide a fast and effective source of protein.
• Dietary sources: Protein powders, meat, fish, eggs, dairy products, legumes, tofu.

Branched-chain amino acids, also called BCAA

• Role: BCAA (leucine, isoleucine, valine) are essential for reducing muscle breakdown during exercise and promoting protein synthesis. They may also help reduce mental fatigue.
• Food sources   :           BCAA supplements, meat, dairy products, legumes.

Dietary supplements play a vital role in optimizing recovery and maintaining the overall health of endurance athletes. By incorporating antioxidants, omega-3 fatty acids, essential vitamins and minerals, as well as proteins and BCAA, athletes can improve recovery, reduce inflammation, and support their immune system. These micronutrients are essential for supporting athletes’ performance, recovery, and overall health. A balanced and varied diet rich in fruits, vegetables, lean proteins, whole grains, and healthy fats is generally sufficient to provide these nutrients. However, in some cases, supplements may be necessary to fill nutritional gaps, particularly for athletes with increased needs due to their activity level. It is important to choose high-quality supplements and incorporate them wisely into a balanced nutrition routine to maximize their benefits. Consultation with a sports nutritionist or healthcare professional is recommended to assess specific needs and adjust supplementation accordingly.

IV. Tips for choosing and using dietary supplements

The need for dietary supplements varies from one individual to another based on several factors, including the type of sport, the intensity and duration of training, age, sex, and overall health. It is essential to conduct a personal assessment, either independently or with a healthcare professional, to determine potential deficiencies and specific needs. A blood test can be performed to identify deficiencies that may need correcting instead of taking supplements blindly without knowing.

       1)   Choosing high-quality supplements

It is crucial to read product labels carefully to check the ingredient list and recommended doses. Choose dietary supplements from reputable, certified brands. Look for products that have been third-party tested to ensure their purity and effectiveness.

For omega-3s, for example, you can look for or ask the manufacturer for the Totox value. The Totox value is a measure of the oxidation of oils and fats, used particularly in the fish oil and vegetable oil industries for oils rich in omega-3s. It assesses the freshness and quality of oils, which is particularly important because their effectiveness depends on it.

The EPAX label: a guarantee of quality for fish oils

Source: https://www.bio-infos-sante.fr/label-epax-gage-de-qualite-huiles-de-poissons/

 

• Incorporate supplements into a balanced diet

Supplementing rather than substituting is the foundation of dietary supplements. Make sure to

which is necessary before turning to supplements. They should be used to fill nutritional gaps, not to compensate for an unbalanced diet. A diet rich in fruits, vegetables, lean proteins, whole grains, and healthy fats remains the foundation of good nutrition.

 

Also, be aware that the timing of supplement intake can influence its effectiveness. For example, protein is better absorbed when consumed after training, while certain minerals such as magnesium can be taken in the evening to promote muscle relaxation. Iron intake should also be separated from the consumption of caffeine, tea, or calcium-rich foods. These can interfere with iron absorption.

Also beware of overdosing, particularly on iron or vitamin C. This can be harmful to you! Symptoms include vomiting, vomiting blood, diarrhea, abdominal pain, irritability, and drowsiness.

• Adjust supplementation to training phases

During periods of intensive preparation or competition, your needs for supplements, protein, and electrolytes may increase. Adjust your supplementation accordingly to support effort and recovery.

During recovery or rest phases, adjust your carbohydrate intake to help you recover and perform better.

 

Conclusion

In summary, dietary supplements offer significant benefits for endurance athletes by meeting specific nutritional needs and supporting optimal performance. They help fill gaps left by a traditional diet, accelerate recovery, improve performance, and maintain good overall health. To maximize their benefits, it is essential to choose high-quality supplements and incorporate them wisely into a well-balanced nutritional routine.