What is the function of Vitamin A?

• A. A primary energy source
• B. Antioxidant that promotes good vision and reproductive health
• C. A component of collagen synthesis
• D. Essential for iron transport

Answer: (B)

Vitamin A's important role is supporting vision, epithelial health, and reproductive function, with antioxidant activity also tied to its carotenoid precursors. In the eye, retinal combines with opsin to form rhodopsin, the photopigment that enables light detection and adaptation to low-light conditions, making good vision a direct, well-known outcome of adequate vitamin A. Beyond the eye, vitamin A helps maintain the integrity of mucosal and epithelial tissues and supports normal growth and reproductive health. Its antioxidant aspect comes from carotenoids that can neutralize free radicals, complementing its broader roles in protecting tissues.

This isn’t an energy source, so it doesn’t serve as fuel like carbohydrates, fats, or proteins. It isn’t directly involved in collagen synthesis—that process relies on vitamin C. And iron transport isn’t a vitamin function; while vitamin C can aid iron absorption, iron transport itself is handled by proteins such as transferrin, not vitamin A.