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Immune System:

Vitamin A is essential to maintain intact epithelial tissues as a physical barrier to infection, maintaining a number of immune cell types. These include the lymphocytes (B-cells, T-cells, and natural killer cells), as well as many myelocytes (neutrophils, macrophages, and myeloid dendritic cells).

Formation of red blood cells:

Vitamin A may be needed for normal haematopoiesis; deficiency causes abnormalities in iron metabolism.

Growth:

Vitamin A affects the production of human growth hormone (GH).

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