Washington Esthetician State Board Practice Exam 2025 – Complete Prep Resource

The correct response identifies fatty acids as the type of ingredients produced by plant oils or animal fats. Fatty acids are carboxylic acids with long aliphatic chains, which can be saturated or unsaturated. These compounds are integral components of fats and oils, making them essential in various cosmetic formulations.

Plant oils, such as olive oil or coconut oil, and animal fats, like tallow, are rich in triglycerides that break down into fatty acids and glycerol. In skincare and cosmetics, fatty acids are known for their moisturizing properties and ability to enhance the skin's barrier function. They are commonly used in products to provide hydration and nourishment to the skin.

In contrast, mineral oils are derived from petroleum and do not originate from plant or animal sources, while silanes are organosilicon compounds not related to fats or oils. Aromatics typically refer to compounds containing a benzene ring, which are not primarily sourced from fats or oils. Thus, fatty acids are the appropriate choice, as they are directly associated with the natural fats and oils sourced from plants and animals.