Colorado Cosmetology Written Practice Exam

Skin is the largest organ in the body and requires certain nutrients to function properly. Fats are actually essential for healthy skin as they provide the necessary fatty acids to maintain the skin's barrier function. Proteins, vitamins, and water are also important for maintaining healthy skin. Proteins are needed for cell growth and repair, vitamins such as A, C, and E help with collagen production and protection against sun damage, and water helps keep the skin hydrated and plump. Therefore, A is the incorrect answer as all of the options listed are essential for maintaining healthy skin.