High-Dose Antioxidants Linked to Birth Defects in Mice

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A new study from the Texas A&M College of Veterinary Medicine and Biomedical Sciences found that regularly consuming high doses of antioxidants like N-acetyl-L-cysteine (NAC) and selenium can negatively impact sperm DNA and lead to offspring born with differences in craniofacial development, even when the father's health doesn't change. The researchers examined the effects in mouse models and discovered that the offspring, particularly females, exhibited symptoms like closer-set eyes and smaller skulls, which are also signs of fetal alcohol syndrome.

Why it matters

The findings suggest that men should exercise caution when consuming high doses of antioxidants, especially if they are planning to have children. While antioxidants are often touted as miracle supplements, this study shows that too much of a good thing can have unintended consequences on reproductive health and offspring development.

The details

In the study published in Frontiers in Cell and Developmental Biology, a team led by Dr. Michael Golding examined the effects of NAC and selenium in male mice. They found that offspring of the male mice exposed to high doses of these antioxidants for six weeks exhibited skull and facial shape differences, even though the father's health did not change. The researchers noted that these abnormalities, like closer-set eyes and smaller skulls, are also symptoms of fetal alcohol syndrome, suggesting a link between high antioxidant levels and central nervous system dysfunction.

• The study was published on February 5, 2026.

What they’re saying

What’s next

The researchers plan to continue studying the potential central nervous system dysfunction in the offspring of male mice exposed to high doses of antioxidants.