Question 1

What is the primary mechanism by which AHAs like glycolic acid exfoliate the skin?

Accepted Answer

AHAs work by loosening the bonds (desmosomes) between dead skin cells in the stratum corneum, promoting cell shedding and revealing fresher skin beneath. This process accelerates natural cell turnover without physically scrubbing.

Question 2

Why is salicylic acid classified as a BHA and how does its oil-solubility benefit acne-prone skin?

Accepted Answer

Salicylic acid is a beta-hydroxy acid because its hydroxyl group is positioned on the beta carbon of the molecule. Its oil-solubility allows it to penetrate through sebum into hair follicles, where it exfoliates inside the pore and helps dissolve comedones that AHAs cannot reach.

Question 3

How does tretinoin differ from over-the-counter retinol in terms of potency and required conversion steps?

Accepted Answer

Tretinoin (retinoic acid) is a prescription-strength retinoid that directly binds to retinoic acid receptors in the skin, requiring no metabolic conversion. Retinol is an OTC form that must be converted twice—first to retinaldehyde, then to retinoic acid—making it significantly less potent per unit concentration.

Question 4

How do chemical sunscreen ingredients like avobenzone protect the skin differently than physical blockers like zinc oxide?

Accepted Answer

Chemical sunscreens such as avobenzone absorb UV radiation and convert it into heat, which is then released from the skin. Physical blockers like zinc oxide sit on top of the skin and reflect or scatter UV rays away from the surface without converting them to thermal energy.

Question 5

What is L-ascorbic acid and why is it the preferred form of vitamin C in topical skincare formulations?

Accepted Answer

L-ascorbic acid is the biologically active, pure form of vitamin C that directly neutralizes free radicals and stimulates collagen synthesis in the dermis. It is the preferred form because it is the only type directly usable by skin cells without requiring enzymatic conversion, though it is unstable and prone to oxidation.

California Esthetician State Board Exam — Cosmetic Chemistry & Ingredients

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