NPLEX II Minor Surgery Practice Test

Niacinamide is a topical form of which vitamin, and what is a typical concentration for acne use?

Vitamin B3; 3-5% concentration Vitamin C; 5-10% concentration Vitamin B5; 2-4% concentration Vitamin A; 1-3% concentration

Correct Answer:

Vitamin B3; 3-5% concentration

Explanation:

Niacinamide is the topical form of vitamin B3 (nicotinamide). It helps acne by reducing inflammation, moderating sebum production, and strengthening the skin barrier, which can lead to fewer lesions and better tolerance of other acne treatments. For acne, a typical concentration is 3–5%, which balances efficacy with tolerability. Higher concentrations don’t necessarily add benefit and can increase irritation, while lower ones may be less effective. Niacinamide is preferred over niacin because the latter can cause flushing when used topically.

Access more questions from this quiz

Continue to NPLEX II Minor Surgery Practice Test for more practice questions and the full quiz experience.

Access More Questions