An emulsifier is an ingredient that is added to a formulation for the purpose of keeping ingredients from separating in an emulsion. By definition, an emulsion is a dispersion of two or more immiscible (normally incapable of being mixed) ingredients. For example, a formulation that contains both water and oil components is an emulsion and would require an emulsifier. This is because when water and oil are mixed together and shaken, a dispersion of oil droplets in water – and vice versa – is formed. However, these two phases can separate if the product is left to settle. To address this problem, an emulsifier can be added to the system to help the droplets remain dispersed. improve the consistency of a product, which enables an even distribution of topical skin care benefits.