Washington Esthetician State Board Practice Exam

Which vitamin is essential for healthy skin and can be synthesized by the body through sunlight exposure?

1. Vitamin A

2. Vitamin C

3. Vitamin D

4. Vitamin E

The correct answer is: Vitamin D

Vitamin D is essential for maintaining healthy skin and plays a critical role in various skin functions, including repair and metabolism. The body can synthesize vitamin D when skin is exposed to sunlight, specifically ultraviolet B (UVB) radiation. This unique ability to produce vitamin D from sun exposure distinguishes it from other vitamins, which typically must be obtained through diet. Vitamin D contributes to skin health in several ways, such as supporting the immune system, which can help prevent skin infections and conditions like acne. It also promotes skin cell growth and repair, aiding in the upkeep of a healthy skin barrier. Furthermore, vitamin D has anti-inflammatory properties, which can be beneficial in managing skin conditions characterized by inflammation, such as psoriasis. Other vitamins mentioned, like A, C, and E, while important for skin health, cannot be synthesized by the body through sunlight and must be acquired through dietary sources or topical applications.