Utah Esthetician State Board Practice Exam 2026 - Free Esthetician Practice Questions and Study Guide

Peptides are indeed short chains of amino acids linked by peptide bonds, which are fundamental components of proteins that play various roles in the body, including the skin. In skincare, peptides are notable for their ability to penetrate the skin and promote collagen production, enhance skin barrier function, and improve overall skin texture and firmness. Their specific structure allows them to signal to skin cells to perform certain functions, such as healing or rejuvenation, thereby contributing to the skin's health and appearance. This aligns well with the benefits and purposes of peptides in topical formulations.

Other choices do not accurately represent the primary function of peptides in skincare. While preservatives are important in maintaining the shelf life of products, they do not describe the role of peptides. Thickening agents serve to alter the texture of cosmetic formulations but have a different function from that of peptides. Similarly, peptides do not provide sun protection; that role belongs to sunscreens containing specific active ingredients designed for that purpose.