Dimethylpolysiloxane

What this is

Food-grade dimethylpolysiloxane is a mixture of long silicone chains used to control foam. Available absorption studies suggest that little enters the body after swallowing, with most recovered material leaving in feces. EFSA’s 2020 assessment found no systemic safety concern at reported food uses and set an acceptable daily intake of 17 mg/kg body weight. Its modeled intake estimates were much lower. JECFA retains a separate, lower value of 0–1.5 mg/kg for specified material. These values come from different assessments and should not be averaged. Long-term rat evidence did not show increased tumors; eye changes in other studies were attributed to direct contact with treated feed or contaminated fur. This does not mean every silicone material is biologically inactive. A 2021 laboratory study found membrane interactions, while a 2026 worm study reported toxicity from components used to make silicone devices. Neither demonstrates harm from ordinary dietary exposure to food-grade PDMS. Purity remains relevant because smaller cyclic contaminants can behave differently. Direct long-term human food-use evidence remains limited.

Safety Review

The health areas reviewed when evaluating an ingredient. This does not mean the ingredient is proven to cause harm.

EFSA’s integrated animal and absorption evidence supported a daily intake value of 17 mg/kg body weight, while JECFA retains 0–1.5 mg/kg for specified material; modeled European food-additive exposure was below both values. Long-term rat studies did not establish a cancer concern, and corneal lesions in other experiments were attributed to local contact rather than systemic effects after swallowing. A newer membrane experiment and a worm leachate study challenge blanket claims that all silicones are inactive, but their materials, direct-contact conditions and outcomes do not establish harm from ordinary food-grade PDMS exposure. Smaller cyclic contaminants can be absorbed, so product specifications matter, and limited direct human evidence prevents an absolute guarantee of no harm.