Magnesium trisilicate

Magnesium trisilicate is a food additive that is used as a kind of absorbent to filter unwanted residue fat used frying oil. The additive is often employed by fast food chains to absorb fatty acids and remove impurities which form in edible oils during the frying process.

Suspected health effects
On March 12, 2007, Chinese health authorities seized and halted the use of Magnesium trisilicate at Shaanxi Province KFC franchises, suspecting it to be a possible carcinogen.