Antioxidants & Athletic Performance: What the Latest ISSN Position Stand Reveals

In the world of sports nutrition, antioxidants have always sparked debate. Should athletes load up on antioxidant supplements to speed recovery? Or could too much blunt the very gains you’re training for?

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The latest position stand from the International Society of Sports Nutrition (ISSN) provides much-needed clarity. This evidence-based review synthesizes decades of research to deliver practical guidance for athletes, coaches, and performance professionals.

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🔍 Understanding Oxidative Stress and Athletic Adaptation

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At the heart of the position stand is the concept of redox balance — a spectrum where both too little and too much oxidative activity can affect training outcomes:

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• Oxidative eustress: moderate levels of exercise-induced free radicals (ROS/RNS) are not only normal but essential. They act as signals that help trigger adaptations like improved endurance and muscle resilience.
• Oxidative distress: excessive levels — common after very intense or prolonged training with poor recovery — can contribute to muscle damage, inflammation, and performance decrements.

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This dual role explains why antioxidants can be both friend and foe: they support recovery when properly used but can hamper adaptations if overused in high doses.

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🍎 Food First — Your Best Antioxidant Strategy

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The ISSN strongly endorses a food-first approach to antioxidant intake. Whole foods rich in vitamins, polyphenols, flavonoids, and carotenoids — such as berries, cherries, nuts, leafy greens, and colorful vegetables — provide a broad spectrum of protective compounds along with other essential nutrients.

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Regular training itself also strengthens the body’s own antioxidant defenses, which often reduces the need for supplemental antioxidants.

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💊 When (and If) to Consider Supplements

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The position stand isn’t dismissing supplements entirely — it simply urges context and caution:

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✅ Supplements may be beneficial when:

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• Dietary intake is insufficient or nutrient deficiencies are present
• Training load is exceptionally high with inadequate recovery
• Specific antioxidant compounds show good evidence of aiding recovery without interfering with adaptations

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Notably, certain nutrients like tart cherry, creatine monohydrate, astaxanthin, and omega-3 fatty acids scored better evidence for aiding recovery and performance when used appropriately in athletes.

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❌ High-dose antioxidant mega-supplementation — especially taken chronically — can suppress the very oxidative signals that help your muscles adapt to training.

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🌟 What This Means for Athletes & Coaches

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Here’s how to apply the ISSN’s evidence-based stance:

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✔ Prioritize a varied, whole-food diet rich in natural antioxidants.

✔ Let training adaptations build your body’s own antioxidant systems.

✔ Use supplements selectively and purposefully — not as a daily crutch.

✔ Align antioxidant intake with specific training goals (e.g., recovery phases vs. adaptation phases).

✔ Tailor advice to individual needs — genetics, training status, diet, and recovery all matter.

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In a nutshell: antioxidants are valuable, but more isn’t always better. Balance, food first, and context matter most.

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