Women undergoing IVF or ICSI who have higher levels of the chemical PFHxS in their blood tend to produce fewer high-quality embryos, according to observed data.

Pro

Against

Mechanism

Synthesis from 1 study

How it works

A chemical in the blood gets into egg cells and stops them from making enough energy. Without enough energy, the early embryo can't develop properly and doesn't become a high-quality blastocyst.

Most probable mechanism

In Simple Terms

A chemical in the blood interferes with the energy production system inside egg cells and early embryos, causing them to develop poorly and fail to become high-quality embryos.

Causal chain

PFHxS accumulates in ovarian follicular fluid and oocytes due to its lipophilic and persistent nature

Supported by evidence

which leads to

PFHxS binds to and inhibits key enzymes in the mitochondrial electron transport chain, reducing ATP production

Indirect evidence only

which leads to

Reduced cellular energy impairs critical processes in early embryonic development, including chromosomal segregation, cell division, and blastocyst formation

Indirect evidence only

which leads to

Embryos with insufficient energy fail to meet morphological criteria for high quality, resulting in reduced numbers of viable blastocysts

Supported by evidence

Evidence from Studies

Supporting (1)

Community contributions welcome

Associations between per- and polyfluoroalkyl substances and reproductive outcomes among women undergoing in vitro fertilization/intracytoplasmic sperm injection treatment.

Cross-Sectional Study

Human

2026 Jan

Contradicting (0)

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Associations between per- and polyfluoroalkyl substances and reproductive outcomes among women undergoing in vitro fertilization/intracytoplasmic sperm injection treatment.

Score: 46

DOI: 10.1016/j.reprotox.2025.109107

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