Early BPS Exposure Triggers Iron-Driven Cell Death in Testes

Early-life exposure to bisphenol S (BPS) doesn't just disrupt hormones. It causes a specific type of cell death called ferroptosis in the testes, driven by iron buildup and mitochondrial damage.

What the Study Found

A 2026 study in Reprod Toxicol exposed mice to BPS during early life at three dose levels. The effects on male offspring were severe: damaged testicular tissue, fewer sperm, more abnormal sperm, and suppressed testosterone production.

Key enzymes for making testosterone (CYP11A1, CYP17A1, STAR, and HSD17B3) were all disrupted. The hormone production machinery was broken.

Iron Buildup and Cell Death

BPS triggered oxidative stress in the testes. Antioxidant defenses collapsed. Then iron started accumulating in testicular tissue, and mitochondria got damaged. This set off ferroptosis, a form of cell death driven by iron and lipid damage.

When researchers blocked ferroptosis with a drug called Fer-1, testosterone production came back and the damage reversed. That proves ferroptosis is the mechanism, not just a side effect.

BPS Is Everywhere

BPS is in thermal receipt paper, food packaging, and products labeled "BPA-free." Companies switched from BPA to BPS, but the replacement is causing the same kind of reproductive damage through a newly identified pathway.

Protect Your Family

Limit exposure during pregnancy and early childhood. Avoid heating food in plastic. Skip receipts or wash hands after touching them. Use glass containers for baby food. Find safer products at non-toxic baby products.

Also see glass food storage for safer alternatives.

Source: Su Y, et al. (2026). Reprod Toxicol.