Can DINCH in soft plastic toys and food packaging be linked to rheumatoid arthritis?
caution
What DINCH is
DINCH (diisononyl cyclohexane-1,2-dicarboxylate) is a plasticizer. Plasticizers make PVC plastic soft and bendy. A 2018 paper in Environmental Science and Pollution Research describes DINCH as used in PVC products such as toys and food packaging.
What the research says
A 2026 cross-sectional study in Ecotoxicology and Environmental Safety looked at U.S. adult NHANES data. Adults with urinary DINCH levels above 1.0 ng/ml had higher odds of reporting rheumatoid arthritis than adults with lower levels. The study found a link. It did not prove that DINCH causes arthritis.
The 2018 DINCH paper also reported possible DINCH exposure markers in at least one human urine sample. That supports a simple point: people can be exposed to DINCH, and scientists are still learning how that exposure may affect health.
What to do at home
You do not need to panic. One adult study is not enough to prove harm from a toy or food package. But if you want to lower plasticizer exposure for a baby or child, choose fewer soft PVC plastic items. For toys, wood is a simple swap. For food, glass or stainless steel are good choices when they fit your routine.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Exposure marker discovery of di(isononyl)cyclohexane-1,2-dicarboxylate using two mass spectrometry-based metabolite profiling data processing methods. | Environ Sci Pollut Res Int | 2018 |
| Association between urinary DINCH concentration and rheumatoid arthritis: A cross-sectional study. | Ecotoxicol Environ Saf | 2026 |