Recent Examples on the WebSometimes manufacturers use filler ingredients like magnesium stearate or silicon dioxide to drive production costs down, but those ingredients provide no value. Norcal Marketing, Chron, 4 Feb. 2021 Clozapine, on the other hand, contains milk sugar (lactose) and magnesium stearate, both animal-based. Teresa Graedon, The Seattle Times, 2 June 2017