What mineral is required for Vitamin A transport?

Zinc plays a crucial role in the transport of Vitamin A from the liver to various tissues throughout the body. Vitamin A, which is essential for numerous physiological functions, including vision, immune function, and cellular growth, is stored in the liver. Zinc is a cofactor for the enzyme that converts retinol (the active form of Vitamin A) into retinol-binding protein (RBP), a protein that transports Vitamin A in the bloodstream. Without adequate zinc levels, the synthesis of RBP may be impaired, leading to reduced mobilization of Vitamin A from the liver and its availability to target tissues.

In contrast, while iron, magnesium, and calcium are important minerals for various bodily functions, they do not have a direct role in the transport of Vitamin A. Iron is primarily known for its role in hemoglobin and oxygen transport, magnesium is involved in numerous enzymatic reactions and energy production, and calcium is essential for bone health and muscle function. These minerals do not participate in the synthesis or function of retinol-binding protein and, thus, do not facilitate Vitamin A transport in the same way that zinc does.