What Is Sperm DNA Fragmentation? Does It Affect Fertility and Pregnancy Outcomes?

Episode SummaryA semen analysis can look acceptable on paper — but that doesn’t always mean sperm DNA is in good shape.In this episode, Men’s Fertility Dietitian Alex Hardy explains sperm DNA fragmentation — a deeper layer of sperm quality that isn’t captured by standard semen analysis.We explore what DNA fragmentation actually is, why it matters for fertility and pregnancy outcomes, and why it isn’t part of routine testing for most men.The episode also breaks down what drives DNA damage in sperm, when testing may be useful, and how lifestyle, health, and targeted interventions can influence sperm quality over time.Main TopicsWhat sperm DNA fragmentation is and how it differs from standard semen analysisWhy normal semen results don’t always reflect full sperm qualityHow DNA fragmentation relates to fertility, IVF outcomes, and miscarriage riskWhy DNA fragmentation testing isn’t routinely recommendedWhen testing may be useful in clinical practiceThe role of oxidative stress in sperm DNA damageClinical, lifestyle, and metabolic contributorsCan DNA fragmentation be improved? Where supplements may fit — and their limitationsPractical TakeawaysSperm DNA fragmentation helps explain why semen analysis results and outcomes don’t always alignTesting can be useful, but it’s only part of the picture — the focus is on what’s driving it and what can be improvedImproving overall health remains central — including diet quality, body composition where relevant, sleep, and reducing exposures like smoking, alcohol, and heatClinical issues such as varicocele or inflammation should be assessed and managed appropriatelyTargeted supplementation may play a role in some cases, but the evidence is mixed and not outcome-drivenIn situations like unexplained infertility, recurrent pregnancy loss, or failed treatment, more advanced testing may be worth discussing with a clinicianDisclaimerThis podcast is for general education only and does not replace individual medical or nutrition adviceIf you’re navigating fertility concerns or treatment, speak with your healthcare teamLinksWebsite: axisdietetics.comInstagram: @axisdietetics