This book was inspired by a passion for skin care, science, the history of the cosmeceutical industry, and almost two decades of treating patients with cosmeceutical products. Its goal is to help the reader understand the history of cosmeceutical ingredients, the science behind them, the challenges of using them in a skin care regimen, and learn how to choose what type of ingredients are appropriate for various Baumann Skin Types®. This book is meant to dispel myths and misperceptions about what certain ingredients can and cannot do. It provides an unbiased, brand agnostic approach to the subject. It will explain the various studies on the ingredients and provide detailed references so that the reader can go back and read the original study if they have doubts. It is divided into sections to help the reader classify ingredients in a simple manner, however, some ingredients work for more than one purpose.