Which vitamin is essential for the synthesis of collagen and is also a powerful antioxidant?

The correct choice highlights the crucial role of Vitamin C in the body. It is essential for the synthesis of collagen, which is a protein that provides structure and strength to connective tissues, skin, and bones. Collagen synthesis requires Vitamin C because it acts as a cofactor for the enzymes involved in the hydroxylation of proline and lysine, amino acids that are critical for stabilizing the collagen triple helix structure.

Additionally, Vitamin C is a powerful antioxidant. It helps protect cells from damage caused by reactive oxygen species, which can lead to oxidative stress and various chronic diseases. By scavenging free radicals, Vitamin C contributes to overall health and may support the immune system and skin health.

Vitamins A, D, and K, while important for various physiological functions, do not specifically play a role in collagen synthesis nor are they recognized primarily for their antioxidant properties in the same way that Vitamin C is. Thus, Vitamin C stands out for its dual function, making it the essential vitamin for this particular context.