Can DINCH plastic softener in baby products cause liver damage?
Possibly. DINCH, promoted as a safer phthalate replacement, was linked to arthritis-like inflammation in a population study.
What's actually in it
DINCH (diisononyl cyclohexane-1,2-dicarboxylate) is a plasticizer used as a "safer" replacement for phthalates like DEHP. It's found in food packaging, medical tubing, toys, and cling wrap. Manufacturers switched to DINCH after phthalates were restricted, but DINCH hasn't been studied as thoroughly.
Like phthalates, DINCH leaches from plastic into whatever it contacts, including food, drinks, and saliva from mouthing toys.
What the research says
A 2026 cross-sectional study in Ecotoxicol Environ Saf measured DINCH metabolites in urine and checked for associations with rheumatoid arthritis, an autoimmune condition where the body attacks its own joints.
People with higher urinary DINCH levels had a greater chance of having rheumatoid arthritis. The association held after controlling for age, sex, and other factors.
DINCH may trigger autoimmune responses by disrupting immune regulation. As a relatively new chemical in widespread use, its long-term effects are still largely unknown.
The "safer alternative" may carry its own risks. Until more is known, minimizing contact between food and plastic, regardless of the type of plasticizer used, is the safest approach.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Association between urinary DINCH concentration and rheumatoid arthritis: A cross-sectional study. | Ecotoxicol Environ Saf | 2026 |
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