Antioxidants and Male Fertility: Do They Actually Improve Outcomes?

Episode SummaryIn this episode, Men’s Fertility Dietitian Alex Hardy breaks down antioxidants and their role in male fertility. While the biological rationale is strong, the clinical outcomes are far less consistent. We explore how oxidative stress affects sperm, why antioxidants are often recommended, and what the research actually shows when it comes to semen parameters, DNA fragmentation, and fertility outcomes. This episode builds on the previous discussion of DNA fragmentation and sets up a more targeted look at individual nutrients in upcoming episodes.What You’ll LearnWhat oxidative stress is and why sperm are vulnerable to itHow antioxidants are thought to support sperm healthWhat clinical trials and meta-analyses showWhy results across studies are inconsistentThe difference between improving semen parameters and improving fertility outcomesWhere antioxidants may fit in practiceKey TakeawaysAntioxidants make biological sense, but outcomes are inconsistentSome studies show improvements in sperm parameters, others show little or no effectEvidence for improved pregnancy or live birth outcomes is limited and low certaintyImprovements in lab markers do not consistently translate into real-world fertility outcomesBlanket supplementation is unlikely to produce reliable resultsAntioxidants are best used as targeted tools, not default solutionsEpisode OutlineOxidative stress and sperm vulnerabilityBiological rationale for antioxidantsWhat clinical research shows Cochrane reviews and mixed evidenceThe MOXI trial and what it tells usWhy results vary across studiesDiet patterns versus isolated nutrientsWhere antioxidants fit clinicallyPractical ConsiderationsFocus on the foundations first — diet, lifestyle, and metabolic healthAvoid assuming more antioxidants equals better outcomesBe cautious with supplement stacking and high-dose combinationsConsider whether there is a clear indication, such as oxidative stress riskUse supplements deliberately, not as a starting pointWhat’s NextIn the next episode, we take a more targeted approach by looking at one of the most studied nutrients in male fertility, CoQ10, and where it fits in practice.DisclaimerThis podcast is for general education only and does not replace personalised medical or nutrition advice. If you are trying to conceive or undergoing fertility treatment, discuss your individual situation with your healthcare team.LinksWebsite: www.axisdietetics.comInstagram: @axisdieteticsIf you’re trying to work out what actually matters in your situation and where to focus your efforts, you can book a Sperm Health Assessment at www.axisdietetics.com.