Cellulose is a polymer of sugar molecules extracted from plants or produced synthetically. In cosmetic products, cellulose is added to adjust viscosity, make the product less transparent or act as an absorbent.
PVP is used in cosmetic products and primarily has two functions: it keeps the product solidified and keeps the components dissolved. It may additionally be used in hair products, where it form a layer of film around and provides a hold on the hair. PVP is used with concentrations of 35% or less .
Polyethylene Glycol (PEG) is a polymer of ethylene oxide. PEGs are used as moisturizing ingredient and work as stabilizers on emulsions (mixtures of oily and watery components). It additionally increases the viscosity of a product.
Subtilisin is a protein splitting enzyme, which is primarily used in detergents and cleaning products. The enzyme helps remove protein-containing stains. Subtilsin is extracted from a bacteria species called Bacillus subtilis.