CAC CAC Product Knowledge & Cosmeceuticals 2 — Questions and Answers
Question 1: Which sunscreen ingredient is a broad-spectrum UV filter that functions through a physical mechanism by reflecting and scattering UV radiation?
- Zinc oxide (Correct answer)
- Avobenzone
- Octinoxate
- Homosalate
Correct answer: Zinc oxide
Zinc oxide is an inorganic (physical/mineral) UV filter that reflects and scatters both UVA and UVB radiation without a chemical reaction.
Question 2: Salicylic acid (BHA) is preferred over AHAs for treating acne-prone and oily skin primarily because it is:
- Lipid-soluble and can penetrate into sebaceous follicles (Correct answer)
- Water-soluble and works on the skin surface only
- A physical exfoliant that does not cause irritation
- A prescription-only keratolytic agent
Correct answer: Lipid-soluble and can penetrate into sebaceous follicles
BHA's oil solubility allows it to penetrate pore linings and dissolve sebum and debris within follicles, making it ideal for comedonal and acne-prone skin.
Question 3: The primary role of ceramides in topical skincare formulations is to:
- Restore and reinforce the skin barrier by replenishing intercellular lipids (Correct answer)
- Chemically exfoliate dead skin cells
- Inhibit melanin production
- Provide antioxidant protection against free radicals
Correct answer: Restore and reinforce the skin barrier by replenishing intercellular lipids
Ceramides make up approximately 50% of the skin's intercellular lipid matrix and topical application helps repair a compromised barrier.
Question 4: Vitamin C (L-ascorbic acid) is most effective and stable in topical products at a pH of:
- Below 3.5 (Correct answer)
- Between 5.5 and 7.0
- Above 7.0
- Between 4.5 and 5.5
Correct answer: Below 3.5
L-ascorbic acid requires an acidic environment below pH 3.5 for optimal skin penetration and antioxidant efficacy.
Question 5: A client with a compromised skin barrier would most benefit from which combination of ingredients?
- Ceramides, cholesterol, and fatty acids (Correct answer)
- Glycolic acid and retinol
- Benzoyl peroxide and salicylic acid
- Kojic acid and arbutin
Correct answer: Ceramides, cholesterol, and fatty acids
The skin's natural barrier lipids consist of ceramides, cholesterol, and free fatty acids in a roughly 3:1:1 ratio — replicating this restores barrier function.
Question 6: Which antioxidant ingredient is often paired with vitamin C in formulations to enhance stability and provide synergistic protection against oxidative stress?
- Vitamin E (tocopherol) (Correct answer)
- Lactic acid
- Benzoyl peroxide
- Salicylic acid
Correct answer: Vitamin E (tocopherol)
Vitamin E regenerates oxidized vitamin C and together they provide stronger protection against UV-induced free radical damage than either alone.
CAC CAC Product Knowledge & Cosmeceuticals 2
Which sunscreen ingredient is a broad-spectrum UV filter that functions through a physical mechanism by reflecting and scattering UV radiation?