The anti foam in Still Spirits yeast and nutrient products is a silicon anti foam agent absorbed on an inert (phosphate based) powder carrier.
This ingredient is typically included at very low levels in our products – in this case, the dose would typically be < 50 ppm in the wash.
The material itself is non allergenic, generally regarded as safe (including for use in foods), and approved for use in food and beverage applications as a processing aid to reduce/control foaming.
The carrier is sodium tripolyphosphate, which is approved for use as a food additive and generally regarded as safe (GRAS) according to the FDA in USA.
In addition to this, the material is comprised mostly of water and polydimethylsiloxane, which is the anti foam component.