Esthetician Practice Exam Esthetician Practice Esthetics Chemistry and Ingredients Questions and Answers 3

Question 1

What is the role of a preservative such as phenoxyethanol in cosmetic formulations?

Accepted Answer

To prevent microbial growth and contamination

Answer

Phenoxyethanol inhibits the growth of bacteria, yeast, and mold, extending the shelf life and safety of cosmetic products.

Question 2

Which form of retinoid is available over the counter and converts to retinoic acid in the skin?

Accepted Answer

Retinol

Answer

Retinol is an over-the-counter form of vitamin A that must be converted by skin enzymes into retinoic acid to become active.

Question 3

Niacinamide is a form of which B vitamin commonly used to improve skin barrier function?

Accepted Answer

Vitamin B3

Answer

Niacinamide (vitamin B3) strengthens the skin barrier by boosting ceramide production and reducing transepidermal water loss.

Question 4

Which type of ingredient creates an occlusive barrier on the skin surface to prevent moisture loss?

Accepted Answer

Occlusive

Answer

Occlusives such as petrolatum and mineral oil form a physical barrier on the skin that prevents transepidermal water loss.

Question 5

What is the main concern when using products with a very low pH, such as professional chemical peels?

Accepted Answer

Chemical burns and skin barrier damage

Answer

Very low pH products can cause chemical burns, erythema, and compromise the skin barrier if left on too long or used improperly.

Esthetician Practice Exam Practice Test