Arizona Cosmetology Practice Exam

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Prepare for the Arizona Cosmetology Board Exam with our comprehensive practice tests. Master key concepts with flashcards, multiple choice questions, hints, and detailed explanations. Ace your exam confidently!

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Which cosmetic ingredient is commonly used as a preservative?

Glycerin
Parabens
Ceramides
Allantoin

The correct answer is: Parabens

Parabens are commonly used as preservatives in cosmetics due to their ability to prevent the growth of harmful bacteria and mold, thus extending the shelf life of products. They are effective at low concentrations and have a long-standing history of safe use in the cosmetic industry. By inhibiting microbial growth, parabens help ensure that products remain safe for consumers over time, which is crucial for maintaining product integrity and effectiveness. In contrast, glycerin is primarily a humectant that helps retain moisture, ceramides are natural lipids that restore the skin barrier and retain moisture, and allantoin is known for its soothing and healing properties. While these ingredients serve important functions in cosmetic formulations, they do not possess preservative qualities like parabens do.