Triclosan is an antimicrobial agent and synthetic chemical compound used to reduce the growth of bacteria, fungi and mildew in skincare products like soaps, hand sanitizers, deodorants and acne treatments. But, its use has declined because of growing concerns about risks associated with long-term exposure, specifically its link to increased antibiotic resistance, and potential environmental impact. Many skincare brands have chosen to reformulate their products with alternative, safer antimicrobial ingredients.