High-Dose Antioxidant Supplements May Cause Birth Defects in Offspring

New research from Texas A&M University challenges the widespread belief that antioxidant supplements are universally safe, revealing they may harm future generations through altered sperm DNA. The study examined two popular supplements: N-acetyl-L-cysteine (NAC) and selenium, commonly found in multivitamins and taken to reduce oxidative stress.

Researchers gave male mice these antioxidants for six weeks and found their offspring developed significant facial and skull structural changes. Notably, the fathers themselves showed no visible health problems, making this a hidden risk that could go undetected. Female offspring showed more pronounced physical differences, including closer-set facial features.

The findings emerged from research originally intended to counteract alcohol's harmful effects on reproduction. Dr. Michael Golding's team discovered that while antioxidants are meant to restore balance, excessive doses create their own imbalance. Previous studies have shown very high antioxidant intake can reduce endurance training benefits and hurt athletic performance.

This research is particularly relevant for men planning families, as it suggests sperm health represents another "performance metric" affected by supplement overuse. The facial changes in offspring may also reflect underlying brain development alterations, though more research is needed to understand the full implications.

While the study used mouse models, it raises important questions about supplement dosing and the assumption that "more is better" when it comes to antioxidants.