Michigan Esthetician State Board Exam Practice 2026 – Complete Prep Guide

The definition of a solvent in formulation is a substance that dissolves other ingredients. In the context of cosmetic and skincare formulations, solvents play a crucial role by allowing other compounds to mix uniformly, facilitating the proper distribution of active ingredients and ensuring consistency in the product's texture and application.

Solvents enable the formulation of products such as creams, lotions, and serums by dissolving solid or liquid ingredients, making them easier to blend and apply. They can also enhance the stability and efficacy of the formulation by ensuring that all ingredients work together harmoniously. Common examples of solvents in cosmetic products include water, alcohol, and glycerin, each chosen for their specific properties and ability to dissolve other materials effectively.

In contrast, the other options refer to different roles that substances play in formulation: preservatives are used to prevent microbial growth, stabilizing agents help maintain the formulation's integrity, and thickening agents increase the viscosity of a product. Each has its distinct purpose, but none fulfill the specific function of dissolving other ingredients like a solvent does.