Can bisphenol S from 'BPA-free' products damage your ovarian follicles?

What's actually in it

Bisphenol S (BPS) is the most common replacement for BPA in plastic products. It's in "BPA-free" water bottles, food containers, baby bottles, thermal receipt paper, and canned food linings. When you handle receipts, eat from plastic containers, or drink from BPA-free bottles, you absorb BPS through your skin and gut.

Ovarian follicles are the tiny structures in your ovaries that hold and nourish each egg. You're born with all the follicles you'll ever have. Damage to them early in life is permanent.

What the research says

A 2026 study in Ecotoxicol Environ Saf tested what BPS does to ovarian follicles when exposure happens before puberty. The chemical triggered an enzyme called Cathepsin L inside the granulosa cells that surround and protect each egg.

When Cathepsin L was overactivated, it started destroying the granulosa cells from the inside. Without these supporting cells, the follicles couldn't develop properly. Eggs lost the nourishment and signals they needed to mature.

The damage was dose-dependent: more BPS meant more granulosa cell death and worse follicle health. And because the exposure happened before sexual maturity, the harm was set in motion before the reproductive system was even fully formed.

For girls and young women, avoiding BPS exposure means going beyond "BPA-free" labels. Glass, stainless steel, and silicone products don't contain any bisphenol chemicals at all.