What is perfluorohexyloctane and is it safe in new nonstick cookware?
Unknown. Perfluorohexyloctane is a newer PFAS replacement being studied for metabolic and liver effects.
What's actually in it
Perfluorohexyloctane (PFHXO or F6H8) is a fluorinated compound being evaluated as a PFAS replacement in some coating applications. It's used in eyedrops (Miebo) and is being studied for other uses. Like other fluorinated chemicals, it has a carbon backbone bonded to fluorine atoms, which makes it chemically very stable and potentially persistent.
It was assumed to be safer than longer-chain PFAS because of its different structure. The science on this is now being worked out.
What the research says
A 2026 study in Environ Int mapped the metabolic effects and biotransformation of perfluorohexyloctane in human liver cells. They found it caused metabolic effects in hepatocytes (liver cells) and was partially metabolized into compounds with their own potential toxicity. The parent compound and its metabolites both affected cellular function.
The pattern is familiar: a fluorinated chemical gets used as a PFAS replacement, researchers study it, and they find it has its own toxicity profile. Better data leads to better decisions, but only if consumers don't wait for full certainty before reducing exposure.
The simplest approach: no fluorinated coating at all. Stainless steel cookware requires no fluorinated chemistry and has a 50-year safety track record.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Metabolic effects and biotransformation of perfluorohexyloctane in human hepatocytes | Environ Int | 2026 |
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