Cyclopentasiloxane vs Polysorbate 80: which is worse?
Quick answer: Polysorbate 80 carries the heavier risk profile. Cyclopentasiloxane is restricted in the EU and allowed in the US; Polysorbate 80 is — in the EU and — in the US.
| Property | Cyclopentasiloxane | Polysorbate 80 |
|---|---|---|
| EU status | Restricted | — |
| US status | Allowed | — |
| Risk level | medium | — |
| Banned in | — | — |
| Restricted in | European Union | European Union (ADI 25 mg/kg body weight per day), Australia |
| Category | endocrine disruptor | additive |
| Where it hides | hair serum, primer, deodorant | — |
What is Cyclopentasiloxane?
Cyclopentasiloxane is a volatile silicone (D5) used for smooth, silky texture.
What is Polysorbate 80?
Polysorbate 80 (Tween 80) is a synthetic nonionic surfactant and emulsifier derived from sorbitol and oleic acid (from vegetable oils) through ethoxylation. It is widely used in food to keep water-based and oil-based ingredients uniformly mixed. Chemical formula: polyoxyethylene (20) sorbitan monooleate.
Documented risks
Cyclopentasiloxane: Persistent and bioaccumulative; the EU restricts D5 in wash-off products over environmental and endocrine concerns. The US has no restriction.
Polysorbate 80: Emerging research has raised concerns about polysorbate 80's effects on the gut. A landmark 2015 study in Nature (Chassaing et al.) found that dietary polysorbate 80 and polysorbate 60 at concentrations approaching food use levels promoted colitis and metabolic syndrome in genetically susceptible mice by disrupting the intestinal mucus layer and altering gut microbiome composition. The emulsifiers thinned the protective mucus layer, allowing bacteria to come into closer contact with gut epithelial cells and triggering inflammation. This study was a seminal contribution to gut health research, though it was conducted in mice and requires confirmation in humans. A 2020 follow-up study found that dietary emulsifiers including polysorbate 80 promoted gut inflammation and altered gut microbiome in human participants with Crohn's disease. People with inflammatory bowel disease may be most vulnerable to polysorbate 80's potential gut effects.
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