Vitamin A plays an important role in vision, bone growth, reproduction, cell division and cell differentiation and helps regulate the immune system . It helps maintain the surface linings of the eyes and the respiratory, urinary, and intestinal tracts. When those linings break down, bacteria can enter the body and cause infection. Vitamin A also helps maintain the integrity of skin and mucous membranes that function as a barrier to bacteria and viruses.

Vitamin A plays an important role in vision, bone growth, reproduction, cell division and cell differentiation and helps regulate the immune system . It helps maintain the surface linings of the eyes and the respiratory, urinary, and intestinal tracts. When those linings break down, bacteria can enter the body and cause infection. Vitamin A also helps maintain the integrity of skin and mucous membranes that function as a barrier to bacteria and viruses.